Honda CB750 Sandcast

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1
Engine - Cosmetic Only / Re: cranckase, cylinder and head, finiture
« on: February 20, 2010, 03:03:44 pm »
I found the best way to really clean a sandcast motor is to remove it from frame (or at least strip as much as possible in the frame), plug the intake and exhaust ports w/ plastic milk bottle caps, then drown it in EZ-OFF oven cleaner (wear HD rubber gloves and eye protection), flip it upside down on a wood beer pallette, scrub w/ toothbrush, scotchbrite, hose it down, then etch it w/ hydroflouric acid (wire wheel/chrome cleaner). All engine covers will need refinishing (I like polished aluminum ceramic coated); the crankcases will now be super-sanitary.
These iconic motors should look tough and rough; not pretty.


2
VIN's / Re: ?sandcast? CB750E-1014143
« on: February 19, 2010, 07:54:42 pm »
cbx1047, "The casting date of these cases is 8-11 comming from casting mold E1". Are you referring to the ebay French cases? Some education please?
Where are the casting mold number and/or casting date?
Is there a xref between date and "mold" number?

3
VIN's / Re: ?sandcast? CB750E-1014143
« on: February 19, 2010, 07:53:30 pm »
This is a new one; never heard of such an oddball sandcast. I have engine # CB750E-1010492 and its diecast built 10/69. Maybe its sandcast replacement cases w/ #'s stamped to the blank pad? I've seen several sandcast replacement engine cases w/ no-number blank pads.

4
The Archives / Re: My sancast project
« on: February 19, 2010, 07:49:00 pm »
Nassau Suffolk Chromium Plating (or just about any plater) does CLEAR zinc plating by the lot. Give send them like 5 lbs of hardware, nuts, bolts, washers, screws, rear sprocket, brake stay and adjuster arm, clips, tabs, clamps, carb parts, etc and they charge about $100. Usually you send 2 batches as you forget a few things. If you get real fancy, yellow zinc some of the subtle bits like Honda did but hardly anybody noticed.
Don't powdercoat frame (problems, problems), paint it 90% gloss.
Let me know how the front fender cloning works-out, I need it, too asap!

5
Engine Mechanical / A Real Sandcast Moment...
« on: February 19, 2010, 04:02:06 pm »
...happened yesterday

I'm probably the last person that will ever do this, and the 1st in 38 years. I think thats pretty cool.

6
The Archives / Re: 1969 K0 Diecast Members Should be Member Too
« on: February 19, 2010, 03:48:54 pm »
Everyone is welcome to enjoy the website. I don't think anybody will be doing any cyber-enforcement of owners whose CB750's lack a sandcast motor. An early diecast like yours came w/ a wrinkle tank, double-cut fender, short chainguard, early candy blue-GREEN paint, rolled rear rim, plug key ignition, etc. Probably has sandcast gauge gearboxes. In fact, if you donate all those needed parts to my restoration, we'll make you VP!   ;D

7
Member's Bikes / Vince Ciotti's Award Winning Sandcast
« on: February 19, 2010, 03:44:24 pm »
Vince Ciotti writes:
"Pictured below is my 1969 CB750, VIN # 000374, with the Best In Class award it won at the May 2007 "Ride Into History" motorcycle concourse held in St. Augustine, FL. The judges mentioned it's "historical significance" when making the award, which was a tough win at this show with hundreds of classic old bikes (and, thank god, mercifully few Harleys!).


On the left is my wrench and good buddy, Bobby Thompson from Winter Haven Florida who helped me prep the bike, and I'm on the right, Vince Ciotti, proud owner and member of the Sandcast club."


8
Exhaust / Re: Markings on Early Mufflers
« on: February 19, 2010, 03:38:19 pm »
HM300 stamped around 1035000 or so

9
Parts Q&A's and Feedback. / Re: K0 Right Control Switch Button
« on: February 18, 2010, 08:51:54 pm »
1969 sl350 and cb450 use a black knob

10
VIN's / Re: CB750K0 Knowledge needed
« on: February 18, 2010, 08:34:03 pm »
The pre-production candy gold sandcast at Brighton had a WHITE tank stripe w/ gold sidecover badges. Sandcasts w/ candy gold bodywork are very rare. And very nice-looking.




11
General Discussion / Are Sandcast Motors Faster?
« on: February 18, 2010, 08:28:22 pm »
Is it the cams that make the sandcast motors faster than later CB750's? I've ridden several sandcasts, K0's, and K1's,-the sandcasts are without a doubt always MUCH livelier; even the exhaust note has more snarl to it. Its also rumoured the early sandcasts were factory blueprinted and assembled w/ extra special handling. Maybe the unstamped pipes flow better. Smaller front sprocket may be a contributing factor, also. Anybody ever draw the same conclusion in comparison?

12
The Beginning / Re: Locked Engine
« on: February 18, 2010, 08:22:15 pm »
...that sounds a little more eloquent than using a bandsaw.

13
The Beginning / Re: Locked Engine
« on: February 18, 2010, 08:21:29 pm »
Dump ATF (or better yet, PB Blaster) in plug holes, wait a week, remove alternator cover (not points cover, the nut in center is weak) and rock alternator side center nut w/ an extended socket wrench.

Remove head and wack the pistons w/ a mallet.

If that fails, turn engine on its side then cut off barrels w/ a band saw, rods and all. U taught me that trick.
 :)
Or sell it on eBay....

14
VIN's / Re: "CB750" v.s. "K0"
« on: February 18, 2010, 08:13:19 pm »
When you buy parts at Honda and refer to microfische, the 69/70 model is officially "CB750". 1971 model is "CB750K1". American Honda does not officially refer to ""K0" or "Ko" (note the use of "k-zero" or "k-oh" ANOTHER bit of confusion. And thats an interesting way to find deals on eBay: search CB750K0 and CB750Ko along w/ CB750k - not many others are looking there so bargains pop up in semi-secret  but now THAT "cats out of the bag"). The 77/78 models I think are "CB750K" but not sure. Serial # on frames pinpoint the model; the official year can vary back and forth w/ no rhyme or reason . You can re-title 1970 titles to read 1969 simply by dealing w/ a title company.
While on this subject, note that sandcasts and early diecasts came titled as either 1969 or 1970. And some late serial # K1's (serial # over 100,000) came titled as either 1971 or 1972. All this "floating" sorta like 1964 1/2 Mustangs, or buying a car in Fall of 2004, it comes titled as a 2005. And while we're at it AGAIN, the weight of vehicle on papers can vary, too. 480 lbs the norm but I've seen other #'s because owners write whatever they want or guess.

15
Member's Bikes / this sandcast needs a little work
« on: February 18, 2010, 08:09:28 pm »

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