Honda CB750 Sandcast

Beginning to End - Member Restorations => Restoration of 6457 / E7083 => Topic started by: Marcello Tha on October 16, 2013, 10:41:56 pm

Title: 6457 naked
Post by: Marcello Tha on October 16, 2013, 10:41:56 pm
First of all i’d like to thank all members for their patience, understanding and apologize for my poor English. I started to get a Sandcast fever when i bought a K6 in 2012, imported from the USA. After a few months i saw a K0 (diecast), frame range  # 40.000, i became amazed by the beauty and rarity, there are about 5 or 6 of these in Brazil someone told me. The official import of the Honda CB750 in Brazil started in 1972 . I started looking for a K0 to buy, and a guy knew a person who had a Sandcast and maybe could sell . Sandcast, what the hell is it? I did a brief search on internet and for me there were only few differences between my K6 and the Sandcast, basically the wrinkle tank, double cut fender, four cable carbs, duck tail seat and of course the sandcast engine. How a sandcast arrived in Brazil (?), i’ll someday find out, one thing was certain, there was only one in my country and the best thing, the bike was in my town. I was informed that the owner attended every Sunday morning for a bike meeting in a local square, i got there at 10am and he arrived around noon. I went to the guy, a truck driver that used the bike every day, and asked him if the bike was for sale, he told me that his CB750 was not a common bike, was a Sandcast, was the only one in Brazil and discovered it when he made an advertisement for sale with some photos and hours later someone called asking his account number. At that moment I was glazed and asked what the price would be, and without hesitating he said " 90.000 " , I said " R$ 90.000 is too expensive ( approximately $ 40,000) for a bike in bad conditions like this " He replied , " noooo  U$ 90. 000 ", i asked him to open the tank and said, " your bike has no wrinkle tank and a double cut fender". A few days later i bought the bike, much cheaper than he requested but still expensive, equivalent to the value of my K6 restored, and in my account it would be cheaper than if i imported one (import taxes in Brazil are approximately 150% the value of the bike plus shipping). I thought it would be easy, just a few parts, some paint and i would have my Sandcast . Through SOOC i discovered that the restoration process of a Sandcast it’s not so simple and cheap. I gradually discovered that I had just purchased an engine a frame and a few original parts. I'm sure that, with the help of the members, my future mistakes will be corrected in time. Please, from now do not hesitate to point out my restoration errors.

Thank you.

Marcello Tha

Title: Re: 6457 naked
Post by: Steve Swan on October 16, 2013, 11:19:45 pm
Bravo, Marcello !  you are a welcome member !  To make you feel better, please look under General Discussion at my current project.........
Title: Re: 6457 naked
Post by: Marcello Tha on October 16, 2013, 11:46:24 pm
Grazie Steve, this is my K6.

Marcello

(http://i1322.photobucket.com/albums/u576/Marcello_Malucelli_Tha/Curitiba-20130831-00742_zpsb8e057ff.jpg) (http://s1322.photobucket.com/user/Marcello_Malucelli_Tha/media/Curitiba-20130831-00742_zpsb8e057ff.jpg.html)
Title: Re: 6457 naked
Post by: Steve Swan on October 16, 2013, 11:57:31 pm
A beauty !  You'll really enjoy riding the sandcast.  Really a very different running/riding bike than any K2-K6 !
Title: Re: 6457 naked
Post by: Marcello Tha on October 17, 2013, 07:21:52 pm
The frame was in very good condition, was painted with 90% gloss black and than polished.

(http://i1322.photobucket.com/albums/u576/Marcello_Malucelli_Tha/IMG-20130222-00131_zpsd61ada70.jpg) (http://s1322.photobucket.com/user/Marcello_Malucelli_Tha/media/IMG-20130222-00131_zpsd61ada70.jpg.html)

(http://i1322.photobucket.com/albums/u576/Marcello_Malucelli_Tha/IMG-20130222-00130_zpsb191cf22.jpg) (http://s1322.photobucket.com/user/Marcello_Malucelli_Tha/media/IMG-20130222-00130_zpsb191cf22.jpg.html)
Title: Re: 6457 naked
Post by: Marcello Tha on October 17, 2013, 07:39:12 pm
A beauty !  You'll really enjoy riding the sandcast.  Really a very different running/riding bike than any K2-K6 !

Steve, my fear is that the Sandcast become so beautiful that I did not want to drive it. I know that the K6 will end up getting neglected by the Sandcast or by the CBX1000 1978 that I'm also restoring.
Title: Re: 6457 naked
Post by: Marcello Tha on October 19, 2013, 12:19:55 am
The cylinder and head are ready to be assembled. Pistons, rings, bearings and valves are new, as well as all the chains. I chose to leave the engine again with standard measures. The pistons were measured in 0.50mm and I also had to buy a new crank in good condition, with luck found one with only 5000 miles. The engine owned signs, thankfully only internal, that the chain had broken at some point, which took some of the former owners to change the gear to 18 teeth, put back an original Honda 17 teeths  gear.

Thanks to Joseph T. Marks for all Honda original parts.

Marcello

(http://i1322.photobucket.com/albums/u576/Marcello_Malucelli_Tha/Curitiba-20130319-00235_zps1752a8ed.jpg) (http://s1322.photobucket.com/user/Marcello_Malucelli_Tha/media/Curitiba-20130319-00235_zps1752a8ed.jpg.html)

(http://i1322.photobucket.com/albums/u576/Marcello_Malucelli_Tha/Curitiba-20130819-00713_zpscbb26458.jpg) (http://s1322.photobucket.com/user/Marcello_Malucelli_Tha/media/Curitiba-20130819-00713_zpscbb26458.jpg.html)

(http://i1322.photobucket.com/albums/u576/Marcello_Malucelli_Tha/039be572-5aae-4359-98db-ecd4748781ec_zps38e2c490.jpg) (http://s1322.photobucket.com/user/Marcello_Malucelli_Tha/media/039be572-5aae-4359-98db-ecd4748781ec_zps38e2c490.jpg.html)
Title: Re: 6457 naked
Post by: Marcello Tha on October 19, 2013, 12:47:41 am
Production dates:
Crankcase 8/22/69. Oil pan 8/14/69.

Where can i find more dates?

Marcello

(http://i1322.photobucket.com/albums/u576/Marcello_Malucelli_Tha/Curitiba-20130319-00236_zps8ecaf10f.jpg) (http://s1322.photobucket.com/user/Marcello_Malucelli_Tha/media/Curitiba-20130319-00236_zps8ecaf10f.jpg.html)


(http://i1322.photobucket.com/albums/u576/Marcello_Malucelli_Tha/Curitiba-20130826-00721_zps4ce85c87.jpg) (http://s1322.photobucket.com/user/Marcello_Malucelli_Tha/media/Curitiba-20130826-00721_zps4ce85c87.jpg.html)
Title: Re: 6457 naked
Post by: Marcello Tha on October 19, 2013, 05:36:01 pm
Some of the key parts that had to be changed arrived from YAMIYA, as short chain cover, seat, side covers, no number pipes and DUNLOP tires (f11/k81). Other parts came from various U.S. suppliers, as front disk and the valve breather that shows an amazing original finish. My shocks were from a K2-K6, than i bought a new pair of K1 shocks and a used pair of K0 shocks and will change the coils to have a correct pair. My biggest question today, about my original seat is if I replace, other than the original cover by the Yamiya cover the original foam by the Yamiya foam or keep my original foam.

Thanks.

Marcello

(http://i1322.photobucket.com/albums/u576/Marcello_Malucelli_Tha/Curitiba-20130220-00031_zpseb907aa0.jpg) (http://s1322.photobucket.com/user/Marcello_Malucelli_Tha/media/Curitiba-20130220-00031_zpseb907aa0.jpg.html)

(http://i1322.photobucket.com/albums/u576/Marcello_Malucelli_Tha/Curitiba-20130220-00032_zpsc226f0ea.jpg) (http://s1322.photobucket.com/user/Marcello_Malucelli_Tha/media/Curitiba-20130220-00032_zpsc226f0ea.jpg.html)

(http://i1322.photobucket.com/albums/u576/Marcello_Malucelli_Tha/Curitiba-20130220-00033_zps596e193b.jpg) (http://s1322.photobucket.com/user/Marcello_Malucelli_Tha/media/Curitiba-20130220-00033_zps596e193b.jpg.html)

(http://i1322.photobucket.com/albums/u576/Marcello_Malucelli_Tha/Curitiba-20130220-00036_zps4c200544.jpg) (http://s1322.photobucket.com/user/Marcello_Malucelli_Tha/media/Curitiba-20130220-00036_zps4c200544.jpg.html)

(http://i1322.photobucket.com/albums/u576/Marcello_Malucelli_Tha/Curitiba-20130319-00240_zps27f1fb1e.jpg) (http://s1322.photobucket.com/user/Marcello_Malucelli_Tha/media/Curitiba-20130319-00240_zps27f1fb1e.jpg.html)

(http://i1322.photobucket.com/albums/u576/Marcello_Malucelli_Tha/Curitiba-20130403-00288_zps827e0cf9.jpg) (http://s1322.photobucket.com/user/Marcello_Malucelli_Tha/media/Curitiba-20130403-00288_zps827e0cf9.jpg.html)

(http://i1322.photobucket.com/albums/u576/Marcello_Malucelli_Tha/Curitiba-20130408-00328_zpsc7dedb33.jpg) (http://s1322.photobucket.com/user/Marcello_Malucelli_Tha/media/Curitiba-20130408-00328_zpsc7dedb33.jpg.html)

(http://i1322.photobucket.com/albums/u576/Marcello_Malucelli_Tha/Curitiba-20130408-00327_zps0f93b4f2.jpg) (http://s1322.photobucket.com/user/Marcello_Malucelli_Tha/media/Curitiba-20130408-00327_zps0f93b4f2.jpg.html)

Title: Re: 6457 naked
Post by: Marcello Tha on October 27, 2013, 08:19:17 pm
Last week my mechanic started the engine mount. The green bearings nicely fits the Honda specifications. The standard Honda bearing clearance is 0.020 to 0.046mm and my measurements were close to 0.030 mm. My surprise was to verify that he had not painted the cylinder and he explained that all K0 that he saw or restored in Brazil had the cylinder and the head with a natural finish. I showed him other SOOC members restorations and this myth has been clarified.

Marcello

(http://i1322.photobucket.com/albums/u576/Marcello_Malucelli_Tha/Curitiba-20130319-00231_zps35af0618.jpg) (http://s1322.photobucket.com/user/Marcello_Malucelli_Tha/media/Curitiba-20130319-00231_zps35af0618.jpg.html)

Title: Re: 6457 naked
Post by: Marcello Tha on October 27, 2013, 10:09:41 pm
I Reproduced the Candy Blue Green perfectly at a DuPont dealer, based on my airbox, who owned the original paint.

Below is the formula to be reproduced, I believe the codes are internationaly the same, and can be redone.

BASECOAT (polyester for 0.45 liters)

DX 36: 10.00 grams
DX 24: 0.65 grams
DX 27: 1.65 grams
DX 54: 10.00 grams
DX 34: 8.00 grams
DXBP: 350.00 grams

MIDCOAT / CLEARCOAT (polyester for 0.45 liters)  

DX 24: 15.00 grams
DX 25: 2.00 grams
DX 28: 6.00 grams
DX 09: 0.50 grams
DXBP: 380.00 grams

1 pound = 453.59237 grams


Marcello

(http://i1322.photobucket.com/albums/u576/Marcello_Malucelli_Tha/IMG-20130419-00392_zpsda30433c.jpg) (http://s1322.photobucket.com/user/Marcello_Malucelli_Tha/media/IMG-20130419-00392_zpsda30433c.jpg.html)

(http://i1322.photobucket.com/albums/u576/Marcello_Malucelli_Tha/IMG-20130419-00391_zps36ff2b7b.jpg) (http://s1322.photobucket.com/user/Marcello_Malucelli_Tha/media/IMG-20130419-00391_zps36ff2b7b.jpg.html)

(http://i1322.photobucket.com/albums/u576/Marcello_Malucelli_Tha/IMG-20130419-00389_zps15b6cfbb.jpg) (http://s1322.photobucket.com/user/Marcello_Malucelli_Tha/media/IMG-20130419-00389_zps15b6cfbb.jpg.html)



Title: Re: 6457 naked
Post by: Marcello Tha on October 29, 2013, 07:40:01 pm
The parts arrived from painting, the work quality seems great to me, only one ear and my original airbox are being redone. The hue appears bluer on photo than naked eye.

Marcello

(http://i1322.photobucket.com/albums/u576/Marcello_Malucelli_Tha/Curitiba-20131029-00906_zps6174b0c4.jpg) (http://s1322.photobucket.com/user/Marcello_Malucelli_Tha/media/Curitiba-20131029-00906_zps6174b0c4.jpg.html)

(http://i1322.photobucket.com/albums/u576/Marcello_Malucelli_Tha/Curitiba-20131029-00902_zps6ebc32c8.jpg) (http://s1322.photobucket.com/user/Marcello_Malucelli_Tha/media/Curitiba-20131029-00902_zps6ebc32c8.jpg.html)

(http://i1322.photobucket.com/albums/u576/Marcello_Malucelli_Tha/Curitiba-20131029-00901_zps49d554ea.jpg) (http://s1322.photobucket.com/user/Marcello_Malucelli_Tha/media/Curitiba-20131029-00901_zps49d554ea.jpg.html)

(http://i1322.photobucket.com/albums/u576/Marcello_Malucelli_Tha/Curitiba-20131025-00852_zps24a7b972.jpg) (http://s1322.photobucket.com/user/Marcello_Malucelli_Tha/media/Curitiba-20131025-00852_zps24a7b972.jpg.html)
Title: Re: 6457 naked
Post by: Marcello Tha on October 29, 2013, 09:08:54 pm
I'm trying to repair the sprocket cover and transmission cover that were welded and in these places were very porous (holes). I did the welding and sanding process several times and new holes are appearing, I bought a really sandcast mission cover on ebay, just like my old one,  simultaneouslly  I'll retrieve it. The sprocket cover had the same problem and internally was changed for placing a chain guard, yesterday a member offered to sell me one in good condition, thanks for him.

Marcello

Title: Re: 6457 naked
Post by: Marcello Tha on October 30, 2013, 07:29:34 pm
 :-\
Help me please.

Someone could confirm if the oil tank bolts (90141-300-000) are really yellow zinc plated?

Marcello

(http://i1322.photobucket.com/albums/u576/Marcello_Malucelli_Tha/90141300000_large_zpsefd581a7.jpg) (http://s1322.photobucket.com/user/Marcello_Malucelli_Tha/media/90141300000_large_zpsefd581a7.jpg.html)

(http://i1322.photobucket.com/albums/u576/Marcello_Malucelli_Tha/90141-300-000_zps783678c7.jpg) (http://s1322.photobucket.com/user/Marcello_Malucelli_Tha/media/90141-300-000_zps783678c7.jpg.html)

Title: Re: 6457 naked
Post by: CBman on October 31, 2013, 08:20:34 am
Yes, these should be yellow zinc plated.
Title: Re: 6457 naked
Post by: Marcello Tha on November 03, 2013, 09:27:35 pm
I finished the gauges restore.

I my self sanded and polished the plastic lens, changed the old face plate by a new one, changed the jewels and painted the needles.
A professional refilled the damper and  cleaned the gauge and lubrifricated the internal componentes.
The speedometer had a diecast gear. Marcel den Butter sold me a sandacst gear.
Now both, speedometer and tachometer works perfectly.


Marcello

(http://i1322.photobucket.com/albums/u576/Marcello_Malucelli_Tha/IMG-20130412-00331_zpsab9d9321.jpg) (http://s1322.photobucket.com/user/Marcello_Malucelli_Tha/media/IMG-20130412-00331_zpsab9d9321.jpg.html)

(http://i1322.photobucket.com/albums/u576/Marcello_Malucelli_Tha/IMG-20130412-00332_zps94391c9f.jpg) (http://s1322.photobucket.com/user/Marcello_Malucelli_Tha/media/IMG-20130412-00332_zps94391c9f.jpg.html)

Title: Re: 6457 naked
Post by: Marcello Tha on November 03, 2013, 09:53:38 pm
All parts, including nuts and bolts were correct zinced (white or yellow) or chromed.

Now the motorcycle can be assembled.

Marcello

(http://i1322.photobucket.com/albums/u576/Marcello_Malucelli_Tha/Curitiba-20130830-00734_zps68ef5b9f.jpg) (http://s1322.photobucket.com/user/Marcello_Malucelli_Tha/media/Curitiba-20130830-00734_zps68ef5b9f.jpg.html)

(http://i1322.photobucket.com/albums/u576/Marcello_Malucelli_Tha/IMG-20130826-00719_zps4b04157b.jpg) (http://s1322.photobucket.com/user/Marcello_Malucelli_Tha/media/IMG-20130826-00719_zps4b04157b.jpg.html)
Title: Re: 6457 naked
Post by: Marcello Tha on November 03, 2013, 10:25:20 pm
The engine is assembled, I still need to finish the satin finish on covers and the clutch disks arrive to end the engine.
The alternator/stator cover on the engine will be changed by a correct one that i bought, from another sandcast.

Marcello

(http://i1322.photobucket.com/albums/u576/Marcello_Malucelli_Tha/Curitiba-20130920-00775_zps7856cc10.jpg) (http://s1322.photobucket.com/user/Marcello_Malucelli_Tha/media/Curitiba-20130920-00775_zps7856cc10.jpg.html)
Title: Re: 6457 naked
Post by: Steve Swan on November 04, 2013, 12:17:36 am
Bravo !  Beautiful !
Title: Re: 6457 naked
Post by: Marcello Tha on November 05, 2013, 08:32:15 pm
Bravo !  Beautiful !
Grazie Steve, it is an honor to me receive a compliment from you, i am trying to do my best.

Thanks.

Marcello
Title: Re: 6457 naked
Post by: Marcello Tha on November 12, 2013, 09:53:17 pm
The engine is being assembled into the frame and some satin finish parts are ready.

My birthday is november 28, I hope at least to hear the Yum Yum until that day.

Thanks.

Marcello

(http://i1322.photobucket.com/albums/u576/Marcello_Malucelli_Tha/6457Engine_zpsef8eacd7.jpg) (http://s1322.photobucket.com/user/Marcello_Malucelli_Tha/media/6457Engine_zpsef8eacd7.jpg.html)

(http://i1322.photobucket.com/albums/u576/Marcello_Malucelli_Tha/Curitiba-20130830-00738_zpsb2ce4791.jpg) (http://s1322.photobucket.com/user/Marcello_Malucelli_Tha/media/Curitiba-20130830-00738_zpsb2ce4791.jpg.html)

(http://i1322.photobucket.com/albums/u576/Marcello_Malucelli_Tha/Curitiba-20130902-00749_zps3914dd0a.jpg) (http://s1322.photobucket.com/user/Marcello_Malucelli_Tha/media/Curitiba-20130902-00749_zps3914dd0a.jpg.html)

(http://i1322.photobucket.com/albums/u576/Marcello_Malucelli_Tha/IMG-20130902-00748_zps35305fd2.jpg) (http://s1322.photobucket.com/user/Marcello_Malucelli_Tha/media/IMG-20130902-00748_zps35305fd2.jpg.html)
Title: Re: 6457 naked
Post by: Steve Swan on November 12, 2013, 11:14:04 pm
Finishes on engine beautiful !
Title: Re: 6457 naked
Post by: UK Pete on November 13, 2013, 03:53:09 am
Wow just took a look at your pictures, that looks beautiful well done with all your hard work Marcello, keep it up,it be great to see the finished bike
pete
Title: Re: 6457 naked
Post by: Marcello Tha on November 16, 2013, 11:23:57 am
More photos from the engine assembly.

(http://i1322.photobucket.com/albums/u576/Marcello_Malucelli_Tha/Curitiba-20131005-00810_zps1bd872b3.jpg) (http://s1322.photobucket.com/user/Marcello_Malucelli_Tha/media/Curitiba-20131005-00810_zps1bd872b3.jpg.html)

(http://i1322.photobucket.com/albums/u576/Marcello_Malucelli_Tha/Curitiba-20131005-00807_zpsfce6a3af.jpg) (http://s1322.photobucket.com/user/Marcello_Malucelli_Tha/media/Curitiba-20131005-00807_zpsfce6a3af.jpg.html)

(http://i1322.photobucket.com/albums/u576/Marcello_Malucelli_Tha/Curitiba-20131005-00796_zpsa53bb386.jpg) (http://s1322.photobucket.com/user/Marcello_Malucelli_Tha/media/Curitiba-20131005-00796_zpsa53bb386.jpg.html)

(http://i1322.photobucket.com/albums/u576/Marcello_Malucelli_Tha/Curitiba-20131005-00795_zps04737bef.jpg) (http://s1322.photobucket.com/user/Marcello_Malucelli_Tha/media/Curitiba-20131005-00795_zps04737bef.jpg.html)
Title: Re: 6457 naked
Post by: Steve Swan on November 16, 2013, 04:38:46 pm
Holy WOW !  Bee-u-tee-fullll !
Title: Re: 6457 naked
Post by: Marcello Tha on November 29, 2013, 03:51:15 pm
Yesterday was the #6457 "first run", a very exciting day. The sound that a Sandcast makes can not be compared with my K6.
It will be a 12 months restoration, in 10 days my sandcast will be finished.
I am just waiting to finish the alternator cover and the sprocket cover, and waiting a new generator wire harness arrive. I am using an alternator cover from a later CB750.

Marcello

(http://i1322.photobucket.com/albums/u576/Marcello_Malucelli_Tha/IMG-20131128-01079_zpsfe62f283.jpg) (http://s1322.photobucket.com/user/Marcello_Malucelli_Tha/media/IMG-20131128-01079_zpsfe62f283.jpg.html)

(http://i1322.photobucket.com/albums/u576/Marcello_Malucelli_Tha/IMG-20131128-01076_zps38b69d62.jpg) (http://s1322.photobucket.com/user/Marcello_Malucelli_Tha/media/IMG-20131128-01076_zps38b69d62.jpg.html)

(http://i1322.photobucket.com/albums/u576/Marcello_Malucelli_Tha/IMG-20131128-01072_zpsd5b5309b.jpg) (http://s1322.photobucket.com/user/Marcello_Malucelli_Tha/media/IMG-20131128-01072_zpsd5b5309b.jpg.html)

(http://i1322.photobucket.com/albums/u576/Marcello_Malucelli_Tha/IMG-20131128-01071_zpsa1489892.jpg) (http://s1322.photobucket.com/user/Marcello_Malucelli_Tha/media/IMG-20131128-01071_zpsa1489892.jpg.html)

(http://i1322.photobucket.com/albums/u576/Marcello_Malucelli_Tha/IMG-20131128-01065_zpsced05041.jpg) (http://s1322.photobucket.com/user/Marcello_Malucelli_Tha/media/IMG-20131128-01065_zpsced05041.jpg.html)

(http://i1322.photobucket.com/albums/u576/Marcello_Malucelli_Tha/IMG-20131128-01062_zps18c1fc04.jpg) (http://s1322.photobucket.com/user/Marcello_Malucelli_Tha/media/IMG-20131128-01062_zps18c1fc04.jpg.html)

(http://i1322.photobucket.com/albums/u576/Marcello_Malucelli_Tha/IMG-20131128-01061_zps3ac01a0e.jpg) (http://s1322.photobucket.com/user/Marcello_Malucelli_Tha/media/IMG-20131128-01061_zps3ac01a0e.jpg.html)

(http://i1322.photobucket.com/albums/u576/Marcello_Malucelli_Tha/IMG-20131128-01058_zps4229b57f.jpg) (http://s1322.photobucket.com/user/Marcello_Malucelli_Tha/media/IMG-20131128-01058_zps4229b57f.jpg.html)

(http://i1322.photobucket.com/albums/u576/Marcello_Malucelli_Tha/IMG-20131128-01055_zpsd539bbac.jpg) (http://s1322.photobucket.com/user/Marcello_Malucelli_Tha/media/IMG-20131128-01055_zpsd539bbac.jpg.html)

(http://i1322.photobucket.com/albums/u576/Marcello_Malucelli_Tha/IMG-20131128-01054_zps0e890c3f.jpg) (http://s1322.photobucket.com/user/Marcello_Malucelli_Tha/media/IMG-20131128-01054_zps0e890c3f.jpg.html)

(http://i1322.photobucket.com/albums/u576/Marcello_Malucelli_Tha/IMG-20131128-01048_zpse9fdaa77.jpg) (http://s1322.photobucket.com/user/Marcello_Malucelli_Tha/media/IMG-20131128-01048_zpse9fdaa77.jpg.html)

(http://i1322.photobucket.com/albums/u576/Marcello_Malucelli_Tha/IMG-20131128-01047_zpsa9620e85.jpg) (http://s1322.photobucket.com/user/Marcello_Malucelli_Tha/media/IMG-20131128-01047_zpsa9620e85.jpg.html)

(http://i1322.photobucket.com/albums/u576/Marcello_Malucelli_Tha/IMG-20131128-01044_zps57eff362.jpg) (http://s1322.photobucket.com/user/Marcello_Malucelli_Tha/media/IMG-20131128-01044_zps57eff362.jpg.html)
Title: Re: 6457 naked
Post by: Marcello Tha on November 30, 2013, 08:44:15 pm
(http://i1322.photobucket.com/albums/u576/Marcello_Malucelli_Tha/FILE0098-Coacutepia_zps52788ca1.jpg) (http://s1322.photobucket.com/user/Marcello_Malucelli_Tha/media/FILE0098-Coacutepia_zps52788ca1.jpg.html)

Someone can confirm if these washers  are yellow zinced?
I did yellow zinced but at   http://cb750sandcastonly.com/support21.htm (http://cb750sandcastonly.com/support21.htm)   these nuts appears white zinced.

Marcello
Title: Re: 6457 naked
Post by: kp on November 30, 2013, 09:47:57 pm
My bikes have silver (white) zinc. There are not many bikes on a sand cast that have yellow passivate finish.
Title: Re: 6457 naked
Post by: Marcello Tha on November 30, 2013, 10:05:50 pm
My bikes have silver (white) zinc. There are not many bikes on a sand cast that have yellow passivate finish.

KP and members.

If you find any other inconsistency, please let me know.

Thanks.

Marcello
Title: Re: 6457 naked
Post by: Steve Swan on November 30, 2013, 11:49:57 pm
There are not many bikes on a sand cast that have yellow passivate finish.

My dear Mr. McGovern....   "bikes" on a sandcast..... ;D  what are you dipping into ?  heh, heh

if i recall correctly, the crank case and oil tank drain plugs are yellow zinc.  and spoke nipples. and mounting plates inside airbox and the hex hardware inside the airbox; if i recall correctly.  seems like there might be a couple more parts, but i cannot remember any other yellow zinc parts at this moment.....  
Title: Re: 6457 naked
Post by: kp on December 01, 2013, 01:55:23 am
There are not many bikes on a sand cast that have yellow passivate finish.

My dear Mr. McGovern....   "bikes" on a sandcast..... ;D  what are you dipping into ?  heh, heh

if i recall correctly, the crank case and oil tank drain plugs are yellow zinc.  and spoke nipples. and mounting plates inside airbox and the hex hardware inside the airbox; if i recall correctly.  seems like there might be a couple more parts, but i cannot remember any other yellow zinc parts at this moment.....  
Yeah It's the bloody auto correct that does it Should read bolts ;D
Title: Re: 6457 naked
Post by: kp on December 01, 2013, 01:59:22 am
Steve's pretty well got it nailed. I've never been sure about the horseshoe shaped bracket on the centre stand as these are a common part across a lot of Honda models and some have yellow passionate and some don't
Title: Re: 6457 naked
Post by: Steve Swan on December 01, 2013, 10:46:14 am
seems like later model Honda's had more yellow than earlier models.  i'm not remembering the horseshoe shaped fulcrum sort of plate that attachews spring to center stand being yellow on sandcast. 
Title: Re: 6457 naked
Post by: Marcello Tha on December 01, 2013, 11:01:09 am
At post #26 i had wrote nuts and the correct was washers.
These washers are yellow?

Marcello
Title: Re: 6457 naked
Post by: hondasan on December 01, 2013, 03:02:24 pm
I have some NOS oil tank mounting bolts (the 3 "shoulder" type bolts) which are yellow passivate finish. Just can't be certain that the original sandcast factory fitted ones were the same.

Chris R
Title: Re: 6457 naked
Post by: markb on December 01, 2013, 04:16:33 pm
How about the headlight ring inside the bucket?  I think mine are yellow.
Title: Re: 6457 naked
Post by: Marcello Tha on December 01, 2013, 05:08:00 pm
I have some NOS oil tank mounting bolts (the 3 "shoulder" type bolts) which are yellow passivate finish. Just can't be certain that the original sandcast factory fitted ones were the same.

Chris R

The oil tank bolts are yellow passivate finish, but a very light yellow, i noticed it when i removed it from the place.
The Stanley headlight rim is also yellow passivate finish.
Could we create a list with all the yellow zinced finish parts?

Marcello
Title: Re: 6457 naked
Post by: Marcello Tha on December 01, 2013, 08:15:52 pm
Here goes the "first start up ".

Marcello

CB750 KO 1969 Sandcast Frame #6457 - "First Start Up" (http://www.youtube.com/watch?v=iSciahH5UIU#ws)

Title: Re: 6457 naked
Post by: kp on December 02, 2013, 03:21:41 am
You have done a remarkable job Marcello
Title: Re: 6457 naked
Post by: UK Pete on December 02, 2013, 03:58:13 am
Well done  Marcello the bike started easily and sounds good fantastic job, looking forward to seeing it complete
pete
Title: Re: 6457 naked
Post by: Marcello Tha on December 07, 2013, 08:13:34 pm
My bikes have silver (white) zinc. There are not many bikes on a sand cast that have yellow passivate finish.

Thanks KP.

All sandcasts have white zinced washer (washer, tank collar lock) part 90504-700-000 (white zinced) or some have 90514-700-000 (yellow zinced) ?

My parts list 69.4 shows only 90504-700-000 (white zinced).

My parts list for Honda cb750 - K1 - K2 shows only 90514-700-000 (yellow zinced) for all cb750 until K2.

Why yamiya sells the yellow zinced and a chrome washer, not white zinced ?

http://www.yamiya750.com/index.php?main_page=product_info&products_id=1954 (http://www.yamiya750.com/index.php?main_page=product_info&products_id=1954)

Thanks.

Marcello







Title: Re: 6457 naked
Post by: benjixt on January 14, 2014, 02:19:14 pm
Marcello
congratulation for your sandcast
nice job

i'm surprised regarding the helmet holder bracket  on your frame
normaly on a sandcast you should not have this bracket

Do you know why do you have it?

maybe the rear frame has been changed???

Thank to let me know what do you think

Benji
Title: Re: 6457 naked
Post by: Marcello Tha on January 14, 2014, 06:29:48 pm
Marcello
congratulation for your sandcast
nice job

i'm surprised regarding the helmet holder bracket  on your frame
normaly on a sandcast you should not have this bracket

Do you know why do you have it?

maybe the rear frame has been changed???

Thank to let me know what do you think

Benji

Dear Benji;

Such an obvious thing that escape me. Thank you very very much. I searched and founded a weld on the right side of the rear part but have not found the same weld on the left side. Also found strange the fact that the helmet holder in sandcast is very bad welded, unlike my other CB750.

Other comments from inconsistences are very welcome and this is the goal i posted my bike up close.

I will immediately remove the holder and arrange the weld on the right side, fortunately my frame is painted.

Thanks.

Marcello

Sandcast Rear Frame Weld - Right Side

(http://i1322.photobucket.com/albums/u576/Marcello_Malucelli_Tha/SandcastA_zps752f95a9.jpg) (http://s1322.photobucket.com/user/Marcello_Malucelli_Tha/media/SandcastA_zps752f95a9.jpg.html)

Sandcast Helmet Holder - Welded only the holder?

(http://i1322.photobucket.com/albums/u576/Marcello_Malucelli_Tha/SandcastB_zps68a296d2.jpg) (http://s1322.photobucket.com/user/Marcello_Malucelli_Tha/media/SandcastB_zps68a296d2.jpg.html)

K6 Helmet Holder - Nice Weld

(http://i1322.photobucket.com/albums/u576/Marcello_Malucelli_Tha/K6_zps857207e7.jpg) (http://s1322.photobucket.com/user/Marcello_Malucelli_Tha/media/K6_zps857207e7.jpg.html)
Title: Re: 6457 naked
Post by: hondasan on January 15, 2014, 04:17:48 pm
Likely those helmet holders were welded on by a previous owner.
The weld around the right frame tube is probably due to the frame having broken there, caused by the fitment on an overloaded luggage carrier sometime in the past. It was not uncommon for the back of the frame to break in this way between the end of the rear shock mounting gussets and rear seat loop. On late K0's and onwards Honda extended the rear shock gusset so that it ran further back and strengthened the frame in this region.
I had an early UK die cast bike some years ago which had been welded both sides, and still had a HUGE topbox on its carrier.

Cheers - Chris R.
Title: Re: 6457 naked
Post by: Marcello Tha on January 15, 2014, 04:30:52 pm
Likely those helmet holders were welded on by a previous owner.

Dear Chris;

It is a very plausible teory. Strange also the fact that the shape of the holders are diferente.

Thanks.

Marcello

Title: Re: 6457 naked
Post by: 4pots1969 on June 03, 2014, 05:16:17 am
KP and members.
If you find any other inconsistency, please let me know.
Thanks.
Marcello [/quote]

Hello Marcello,
Why do we see elements of K1/K2?
But maybe of the provisoir?
Thanks, Gerard
Title: Re: 6457 naked
Post by: Marcello Tha on June 03, 2014, 12:47:03 pm
Dear Gerard;

Some parts are "provisoire" or incorrect and are beeing changed right now, like the motor oil cap (i did not noticed that the sandcast was different and installed a new wrong part), alternator cover (is a third type, not the second type), the transmission cover (this is a K0 cover and is different inside), stop switch spring, front whell axel (the sandcast axel was assembled in my K6 and vice versa, erroneously). The helmet hook, welded by the pre owner, was removed.
My motor has an oil leak and next week i will change the studs by APE heavy duty and I will also use the nut caps with copper sealing washers on cylinder head.  My bike had a K2 type clutch basket, I bought a K0 clutch basket and also will change this. The only think that will not be correct will be the nut caps/cooper washers but in my opinion it is worth.

If there is something more please tell me.

Thanks.

Marcello
Title: Re: 6457 naked
Post by: 4pots1969 on June 03, 2014, 01:14:48 pm
Hi Marcello,

I also see the Box batterie, the lock of seat, the clamp tachometer cable (on the horn)
For the copper slices I am also going to make him with nuts domed.

All the best for you!!
Regards Gerard
Title: Re: 6457 naked
Post by: Marcello Tha on June 03, 2014, 03:09:57 pm
Dear Gerard;

I knwen about the seat latch and forget to add this on the other post but not about the box battery and the clamp.

The original battery box was in very bad conditions and when I purchased a substitute I did not noticed that were differences. I will recuperate the old one.

The clamp was the same think, I bought the wrong clamp.

Someone need K1 onward parts?


Thanks Gèrard.


Marcello
Title: Re: 6457 naked
Post by: Marcello Tha on June 04, 2014, 05:58:11 pm
Dear Gérard;

It is a concensus that the caliper bracket is not painted?

If the caliper bracket is not painted it is clearcoated or has natural finish?

Thanks.

Marcello





Title: Re: 6457 naked
Post by: 4pots1969 on June 04, 2014, 06:51:09 pm
Dear Marcello,

The Holder caliper ( 45115-300-030 ) must be painted in grey metal satiny as the CALIPER A and B (45101-300-033 and 45102-300-033)
The JOINT caliper holder (45104-300-040) is not painted, He remains raw in natural finish.

Gerard
Title: Re: 6457 naked
Post by: kmb69 on June 04, 2014, 07:36:29 pm
Marcello,

All of mine appear to be painted. Maybe a little off color from the holder and caliper. Welcome input from others.

Keith
Title: Re: 6457 naked
Post by: Marcello Tha on June 04, 2014, 08:28:46 pm
I don't see any reason for the joint holder be unpainted and the holder painted.
The reasonable to me seem that both were painted or unpainted.
The pin caliper holder is greased? If yes the correct would be that both were not painted?

Marcello

Title: Re: 6457 naked
Post by: Steve Swan on June 05, 2014, 12:04:29 am
232 - raw caliper, painted caliper holder
2157 - painted caliper, painted caliper holder
4363 - raw caliper, painted caliper holder

i see no signs any finish or paint was used, disturbed or removed on both halves (Caliper A/Caliper B) of calipers on 232 and 4363.  i have seen other sandcast calipers raw; unpainted and appearing unmolested.  Given my keen 20/20 vision at 2 inches, i'm led to believe 232 and 4363 calipers were unpainted from factory.  One would think there should be at least a trace of paint on these calipers, there is no evidence of any paint.  i have heard some people say 'sandcast' calipers were always painted.  Given 2157 has a painted caliper, it raises a question why 2157's caliper is painted and the other 2 have no trace of paint.

i have not yet seen a raw caliper holder; only painted.  i have seen caliper holders where the paint is degraded, chipped, or flaking.

It would be good to hear from other members in order to make the best consensus decision.
Title: Re: 6457 naked
Post by: 4pots1969 on June 05, 2014, 04:27:03 am
In any case it is very simple : For them who want that is painted the comb but it is necessary to know that this part has never had a paint has the origin. And no more on the K1 where the K2..


 
Title: Re: 6457 naked
Post by: kmb69 on June 05, 2014, 07:52:37 am
Steve,
You are throwing a new wrinkle in the fray - unpainted calipers? The original question was if the 45104-300-040, "JOINT, CALIPER HOLDER", was painted. I have not closely examined all of mine, but the ones I looked at appear to be painted. Gerard's pictures appear to be unpainted.
Keith


Title: Re: 6457 naked
Post by: Steve Swan on June 05, 2014, 08:16:23 am
uh, oh.  bad steve.  cool !  "another wrinkle..."  no pun intended, eh Keith ?
Title: Re: 6457 naked
Post by: kmb69 on June 05, 2014, 09:00:58 pm
Noooo, not bad Steve. But do you paint your joints or not?  ;) :D ;D
For real, unpainted calipers?  ???
Title: Re: 6457 naked
Post by: Steve Swan on June 05, 2014, 11:48:18 pm
hmmm.  i'll take and post pictures in my spare time.
Title: Re: 6457 naked
Post by: Erling on June 07, 2014, 12:59:57 am
My brake parts looks like in lower picture in answer 51! Little scratches or deterioration of alu? Have not really an eye for these things. Front wheel was only in use for the first couple of month, Over the winter was fitted the 10" Münch drum brake previous on my BMW. In the summer I went to Fontana in Milan/Italy for a 250mm Ø 4 leading shoe brake. Next spring I ran into him on the camping in Salzburg. Was there for the MotoGp of that time. Asked him in my best italian if he would like to see his brake on my Honda? Yes indeed he would like to, and in fluent english. In the first place he did not answer several letters in english asking for the brake! So I had to learn italian I thought. He immediatly pointed out to me the brake cables were wrong set up. It would not brake even! a problem I had wondert about why it did. He explained how to, and I made that when home. It worked well after that. Never met him again! Since then parts for original brake have been stored. A question arises for me. Mirrors? Owners manual have 2 on front page but inside are only one mirror, and my cb750 was delivered without! there is even a plug in the thread on the brake grip.  Dealer told me there were no mirrors for this model! Might that be why some say there are different stem diameter on same bike. After mounting while only one from new? In the day did not use them. Took 10 kmh off top speed on my previous 42 bhp BMW!   
            Erling.
Title: Re: 6457 naked
Post by: kp on June 09, 2014, 06:30:59 pm
You will notice on this bike that there is no paint on the arm holder. I have checked 3 calliper assemblies I have and all are unpainted on this part. KP
http://www.ebay.com/itm/Honda-CB-1969-honda-cb-750-sandcast-cb-750-sand-cast-motorcycle-/171351093502?forcerrptr=true&hash=item27e55230fe&item=171351093502&pt=US_motorcycles (http://www.ebay.com/itm/Honda-CB-1969-honda-cb-750-sandcast-cb-750-sand-cast-motorcycle-/171351093502?forcerrptr=true&hash=item27e55230fe&item=171351093502&pt=US_motorcycles)
Title: Re: 6457 naked
Post by: Marcello Tha on June 09, 2014, 10:09:58 pm
Searching JTMarks NOS parts on ebay I found a caliper joint unpainted and a caliper holder painted.

Marcello
Title: Re: 6457 naked
Post by: 4pots1969 on June 10, 2014, 03:36:45 am
For the first photo, paint where not paint? It is difficult to me to say it..
For the second photo there is no paint, it is a certainty..
Title: Re: 6457 naked
Post by: 4pots1969 on June 10, 2014, 04:19:55 am
We can sometimes see a new part planned to be painted to find itself without paint (45115-300-030)...
It can arrive and it is logical, because a new part can have been forgotten to be painted..
On the other hand you will never see a new part planned by origin without paint by HONDA (45104-300-040) to find itself with the paint, it is impossible!!
You will never see this new part with the paint because it was not registered in the rigorous specifications of HONDA for the CB750..
If you see a part used (45104-300-040) with the paint, it is because she was painted but certainly not by the factory HONDA..
Title: Re: 6457 naked
Post by: CBman on June 10, 2014, 03:12:43 pm
Not only NOS parts, but also joint holder from the bike is NOT painted, and caliper holder IS painted. So in this case I agree with Gerard.
Title: Re: 6457 naked
Post by: Marcello Tha on August 09, 2015, 08:47:30 pm
Hear goes photos from #6457. There are some thinks, like the alternator and sprocket covers that will be redone. I'd like that members helps me fiding inconsistences that still exist. Please, these information are very important to me. I would like to thank all members, specialy Steve Swan,  that helped me a lot. In my opinion, my resto fortunaly will never end, that's the great pleasure.


Title: Re: 6457 naked
Post by: Marcello Tha on August 09, 2015, 09:28:22 pm
More photos.
Title: Re: 6457 naked
Post by: Marcello Tha on August 09, 2015, 09:32:12 pm
More photos.
Title: Re: 6457 naked
Post by: Marcello Tha on August 09, 2015, 09:32:37 pm
More photos.
Title: Re: 6457 naked
Post by: Marcello Tha on August 09, 2015, 09:38:35 pm
More photos.
Title: Re: 6457 naked
Post by: Marcello Tha on August 09, 2015, 09:40:49 pm
More.
Title: Re: 6457 naked
Post by: Steve Swan on August 09, 2015, 10:36:43 pm
A very beautiful result of much diligent work.  Congratulations,  Marcello !
Title: Re: 6457 naked
Post by: Marcello Tha on August 13, 2015, 10:03:10 pm
Fellas, i am disapointed, i'd like to have informations about some inconsistences. Please I have sandcast fever and wanna let my bike the best that I can do.
Title: Re: 6457 naked
Post by: Steve Swan on August 14, 2015, 01:26:14 am
Fellas, i am disapointed, i'd like to have informations about some inconsistences. Please I have sandcast fever and wanna let my bike the best that I can do.

1.  Rubber boots on spark plug caps not period correct original
2.  seat foam should be all red, i'm fairly certain
3.  ferrules on speedo/tach cables should be short i believe  (i turned long ferrules to short in my lathe.)
Title: Re: 6457 naked
Post by: hondasan on August 14, 2015, 01:52:31 pm
One of the best I've seen.
Other than the items Steve observed, all I could observe would be the green gaskets, and the later type airbox to carb rubbers with lip in front of the airbox bands.

Great job.

Chris
Title: Re: 6457 naked
Post by: Marcello Tha on August 14, 2015, 09:14:10 pm
Thanks Steve and Cris. I will post soon photos showing the inconsitences found.

Marcello
Title: Re: 6457 naked
Post by: 4pots1969 on August 15, 2015, 05:25:34 am
Marcello, your bike is Superb.!! Lots of passion and sweat emerge from these pictures...
For me too, the horrible green gaskets which should not beings.
You all know my allergy to these green gaskets... >:( >:(
However for me the seat foam would be good, it was not red everywhere..
I find that the aluminum engine covers are too dull, too mat... And it gives sadness for a whole..
The engines in 1969 were slightly more sparkle in my opinion to be able to attract buyers...
But maybe it's the rendering of pictures?
There are no washers on the screws of the stops of the swing arm...(just for the critic!!!) :D ;)
You are not very far from the absolute truth... ;) ;)

Gerard
Title: Re: 6457 naked
Post by: Marcello Tha on August 15, 2015, 09:46:33 pm
Thanks Steve, Cris and Gerard, I thing that I'm crazy, but I already bought all the missing parts, the tacho and speedo cables with the correct ferrules, the correct period spark plug and airbox rubbers. The covers will be refinished shiny. The seat foam I think that's correct. Now I have to wait two months for the parts to post the final work. Someone can tell me the valve cover gasket color?

Marcello
Title: Re: 6457 naked
Post by: 4pots1969 on August 17, 2015, 05:57:47 am
Marcello, for all engine covers, all joints are black... Originals Honda... And if we want to go further into the details, should also be that the dough has silicone used for assembling the two cranckase either color alu like the original in 1969... And of course, after. For that either completely invisible when it is finish.. Never of dough joined red or black for the Cranckase...
But this is only good advices to avoid unpleasant surprises when it is finish...
Gerard
Title: Re: 6457 naked
Post by: DW69K0 on August 17, 2015, 09:59:58 am
Marcelo,
It does not look like the top front brake is routed through the center of the triple tree, but it is really hard to tell from the photos.
Gorgeous bike! You have invested a lot of time and money to bring her back.
Nice work,
DW