Honda CB750 Sandcast

The Restoration Shop => Chrome - Anodizing and Other Metal Finish Procedures => Topic started by: markb on December 01, 2011, 02:40:33 pm

Title: Please Help Me Check My Chrome Plating List
Post by: markb on December 01, 2011, 02:40:33 pm
I’m going through my parts to get everything ready for plating for #97.  Can I get you experts to scrutinize this list and make sure I have everything correct for chrome?  I don’t need all of these pieces chromed but I figured I might as well make a complete check list.

Here's my edited list (4/28/15):

Seat strap clips and screws
Front brake hose bracket
Point cover
Clutch adjusting cover
Starting motor cover
Gear shift arm and bolt
Kick starter joint
Kick starter arm and bolt
Mirrors & nuts
Handlebar
Front fender & stays
Rear fender
Fuel cap & check
Mufflers
Rear Brake Arm
Rear Brake Pedal
Chain Adjusters
Front & Rear Rims
Side Grip
Rear Shock Covers & Springs
Brackets & Bottom Plates for Tach & Speedo
Headlight Rim & Retaining Ring
Turn signal bases
Fork boot bottom collar
Fork cap bolts
Steering stem nut & washer
Shafts & washers for turn signals on headlight bucket
Tail light base & number plate bracket
Ignition switch washer
Cap nuts and washer for top rear shocks
All bolts, washers & nuts for the handle bar clamps & top bridge
Brake line screws for banjo ends (before VIN 2720)
Six bolts for brake disc
Front fender stay mounting oval head screws
Swing arm pivot bolt and self locking nut
Bolts, washers & nuts for mounting turn signal bases on stems
Lower shock mounting bolts
Kick starter knuckle pin
Clutch & brake lever pivot bolts & nuts
Exhaust pipe joints
Exhaust pipe flanges
Rear axle, washer & nut
Clamps & screws for rubbers from head to carbs (carbs to air box zinc)
Horn
Caliper Adjusting Spring
So by default I believe this means that everything else that's shiny and not aluminum is zinc plated.  Thanks for taking the time to check this out.  Maybe this will be helpful for someone else (whose anal too).
Title: Re: Please Help Me Check My Chrome Plating List
Post by: CB750faces.com (Lecram) on December 01, 2011, 04:22:40 pm
Hi Mark,

I think that your oil tank cap is stainless steel. It is at the later models (K0 - K2), but probably also for the sandcast. You can polish that cap with alu polish
Title: Re: Please Help Me Check My Chrome Plating List
Post by: Steve Swan on December 01, 2011, 09:45:36 pm
Yes also; I've only seen stainless oil caps
Title: Re: Please Help Me Check My Chrome Plating List
Post by: markb on December 02, 2011, 09:44:17 am
This is why I talk to you guys.  :) That makes sense, I'll double check mine tonight.  I was wondering what I was going to do about the dip stick.  I'll update my list accordingly.
Title: Re: Please Help Me Check My Chrome Plating List
Post by: CB750faces.com (Lecram) on December 02, 2011, 04:18:08 pm
This is my K2 cap after polishing

(https://lh6.googleusercontent.com/-JQmVFfiSysE/S0oFEBSnhwI/AAAAAAAABlU/msnxOBjc_ew/s640/Polijstwerk_09-01-2010_38.JPG)
Title: Re: Please Help Me Check My Chrome Plating List
Post by: kp on December 02, 2011, 04:36:17 pm
Hi Mark
Lower shock mounting bolts - Yes
Kick starter knuckle pin - Yes
Kick starter arm bolt, 8x28 - Yes
Clutch & brake lever pivot bolts & nuts - Yes but I would buy new
Front axle & nut - No Zinc Plated as far as I know
Exhaust pipe joints - Yes
Exhaust pipe flanges - Yes Mine are
Rear axle, washer & nut (on head of axle only?) Yes but I think the whole shaft is also chrome plated and maybe resized. That is a good topic as I really can't say with this
Some of the smaller items I tend to buy NOS as the finish with re-chromed stuff is too damn good. Each to their own though
AND the carb clamps but these are satin chrome I think
Title: Re: Please Help Me Check My Chrome Plating List
Post by: markb on December 02, 2011, 06:14:09 pm
Marcel,
That looks great.  It looks like chrome doesn't it.
KP,
Thanks for the comprehensive answer.  I agree it's better to buy the little stuff too but also because it's cheaper than having it plated.  It's even true with some of the bigger items.  For example, I've found it's cheaper to buy handlebars than have them replated.  One little thing I'll have to rechrome is the oil bolts obviously because they're not available in chrome.  They're going to look great with your beautiful hoses.  ;)
Title: Re: Please Help Me Check My Chrome Plating List
Post by: Steve Swan on December 02, 2011, 07:08:57 pm
Re:  Plated finishes for intake rubber manifolds, airbox intake horns and bolts.  

Every CB750 i have seen, 69-onward, the 8 clamps for the rubber intake manifolds have a different plated finish than the 4 clamps for the airbox intake horns.

The manifold clamps appear to have a fairly bright chrome satin sheen to an almost nearly shiny finish.  

The airbox clamps appear much less shiny than the manifold clamps.

Manifold clamps appear to be chrome plated, am sure steel not polished and probably no copper base, perhaps this gives the satin sheen appearance.

Airbox clamps appear dull in contrast to the 8 clamps, appears zinc.

If my memory serves me correctly, seems the manifold clamps are a different size than the airbox clamps.  Cannot remember if there's different pns for these clamps, seem to think there is...... ???

I've also noticed finishes on all bolts are not the same; range from a satin to a shiny.  Most have a satin sheen, but there are others that are shiny.  Larger bolts in more prominent places are more shiny, smaller bolts less shiny.
Title: Re: Please Help Me Check My Chrome Plating List
Post by: hondasan on December 03, 2011, 02:36:18 pm
The 8 manifold clamps are chrome - sometimes full chrome, sometimes less so. The 4 airbox rubber clamps are bzp.
Parts list gives different part numbers for these, presumably due to the different finish. My parts list also shows that the chrome clamps (300 middle number) supercede to to the same part number (230 middle number) as the bzp airbox ones. Presumably therefore these are the same size.
Re-chrome of the original manifold clamps can be a real problem if they are in poor condition - polishers tend to get carried away and destroy them, or at very best return them with custom chrome finish. Maybe the bzp ones could be stripped and then re finished in chrome if original chrome ones missing, or too far gone to restore?
Cheers - Chris R.
Title: Re: Please Help Me Check My Chrome Plating List
Post by: markb on December 05, 2011, 08:33:57 am
I observed the same thing with the part numbers.  Excellent information.  My manifold clamps may be in good enough condition to rechrome without over doing it but I like your idea of using the -230- clamps and chroming them if need be.  It appears that the -230- clamps are available from Honda.  By the way, bzp is zinc plate?
Title: Re: Please Help Me Check My Chrome Plating List
Post by: Wayne on December 05, 2011, 11:27:00 am
I beleive BZP is Bright Zinc Plating Mark. All of my clamps were rotted so I'll be watching thsione closely as well.
Title: Re: Please Help Me Check My Chrome Plating List
Post by: markb on December 06, 2011, 01:36:21 pm
Thanks for all the input guys.  I've edited my list to reflect everyone's comments.  This should be a pretty complete list of everything I need to rechrome or buy.  Once I get that all sorted out I'll go through the zinc.
Title: Re: Please Help Me Check My Chrome Plating List
Post by: markb on December 14, 2011, 09:52:24 am
I think I missed an item.  Is the swing arm (rear fork) pivot bolt chrome too?  One more question, has anyone ever seen an "8" bolt chromed?
Title: Re: Please Help Me Check My Chrome Plating List
Post by: Joe K on December 14, 2011, 09:53:03 pm
As far as I know, the pivot swing arm bolt is chrome and the nut on the opposite side.  I think all of the "8" bolts are anodized, but not positive.  I purchased the set from Yamiya and they are still new.  I chromed several "8" bolts last summer and the chrome covered up the "8" on the bolt, so I wouldn't advise to do it. 

Joe K.
Title: Re: Please Help Me Check My Chrome Plating List
Post by: Steve Swan on December 15, 2011, 07:53:47 pm
I have only have seen chrome on the swing arm shaft and nut.  I do not recall ever seeing any "8" bolt chrome plated; only zinc.
Title: Re: Please Help Me Check My Chrome Plating List
Post by: Riccardo on December 16, 2011, 08:26:54 am
I have only have seen chrome on the swing arm shaft and nut.  I do not recall ever seeing any "8" bolt chrome plated; only zinc.

I agree!

The chromed bolts are "ever" without "8".

They are only plan.
Title: Re: Please Help Me Check My Chrome Plating List
Post by: markb on December 16, 2011, 10:46:06 am
I've added the swing arm pivot bolt to the list.
Title: Re: Please Help Me Check My Chrome Plating List
Post by: markb on January 03, 2012, 07:22:59 pm
I have a question about another item.  Is the gear box retainer cover, 44642-300-000, on the front wheel chrome plated?  And just double checking, are the six bolts and nuts chrome plated too?
Title: Re: Please Help Me Check My Chrome Plating List
Post by: Wayne on January 03, 2012, 10:05:23 pm
My cover was removed for the dual disk brake conversion Mark but I believe the bolts are original. Gold Zinc. The nuts, I'm not sure of. They are slotted lock nuts and appear to be Clear Zinc plated.
Title: Re: Please Help Me Check My Chrome Plating List
Post by: Steve Swan on January 03, 2012, 10:19:34 pm
The cover is sort of a dull chrome, perhaps only nickle and chrome (no copper plate under nickle...?)  The bolts are chrome.  As my memory serves me, the nuts are clear zinc.
Title: Re: Please Help Me Check My Chrome Plating List
Post by: kp on January 04, 2012, 05:09:55 am
I believe the bolts and nuts are chrome. The plate ............. not ever thought about that. It's not stainless is it?
Title: Re: Please Help Me Check My Chrome Plating List
Post by: Steve Swan on January 04, 2012, 09:17:57 am
plate's not stainless
Title: Re: Please Help Me Check My Chrome Plating List
Post by: hondasan on January 05, 2012, 05:09:35 pm
Chrome plate and bolts, nuts and lockwashers definately bzp (bright zinc).
Chris R.
Title: Re: Please Help Me Check My Chrome Plating List
Post by: markb on January 05, 2012, 05:30:54 pm
My cover was removed for the dual disk brake conversion Mark but I believe the bolts are original. Gold Zinc. The nuts, I'm not sure of. They are slotted lock nuts and appear to be Clear Zinc plated.
Would the original bolts be long enough for the dual conversion?  I've never seen slotted lock nuts on the front disc.  Maybe those bolts and nuts were part of a conversion kit?
Title: Re: Please Help Me Check My Chrome Plating List
Post by: Wayne on January 05, 2012, 07:07:30 pm
My cover was removed for the dual disk brake conversion Mark but I believe the bolts are original. Gold Zinc. The nuts, I'm not sure of. They are slotted lock nuts and appear to be Clear Zinc plated.
Would the original bolts be long enough for the dual conversion?  I've never seen slotted lock nuts on the front disc.  Maybe those bolts and nuts were part of a conversion kit?

When I think about it they could have been part of the kit Mark. I thought perhaps with the cover removed they may have had enough bolt length. Now that I think about it the cover is probably not near as thick as a rotor hence the different bolts. Odd they used gold zinc. Since I'm going to retain the dual disk setup I'll stick with it unless I find info to the contrary.
Title: Re: Please Help Me Check My Chrome Plating List
Post by: markb on January 05, 2012, 07:11:06 pm
OK, it's not that I didn't trust anyone's opinion but I did a little research on testing for chrome and zinc plating.  I found that you can use hydrocloric acid to test.  A drop of concentrated acid on chrome will have a mild reaction and turn from clear to green after a minute and on zinc will have a vigorous and immediate reaction.  I found some toilet bowl cleaner that contains hydrocloric acid but I'm not sure that it's very concentrated.  I put a drop on a known zinc part and a disc nut and there was an immediate reaction.  The nuts that hold the brake disc are definately zinc.  I tried a drop on the disc bolts and plate and after a minute there was virtually no reaction and it seemed to turn a little yellowish maybe.  No doubt the finish is not zinc so I think I can safely say the plate and bolts are chrome.  With a more concentrated solution I probably would have gotten the expected result.  The plate may be only nickel and chrome but mine is quite shiny.  The metal itself just isn't polished and probably makes is seem duller.  Take it for what it's worth.      
Title: Re: Please Help Me Check My Chrome Plating List
Post by: markb on January 08, 2012, 05:29:08 pm
I thought of one more thing, the horn cover.  Tough one to do.  I'm glad I have one that doesn't need it.  I've added it to the list.
Title: Re: Please Help Me Check My Chrome Plating List
Post by: markb on January 30, 2012, 09:36:45 am
Two more: seat strap clips and screws, front brake hose bracket.
Title: Re: Please Help Me Check My Chrome Plating List
Post by: ashimotok0 on April 04, 2015, 02:52:51 pm
 I was just looking at the 10/69 parts  manual, as I am unsure on the finish of 'Spring Adjusting Caliper' 45119-300-020. Mine from 10/69 looks like it was chromed but not sure if it's standard. Anyone know?

There is a person on eBay UK selling polished SS springs for the CB400/4 brake and claims originals were chromed but it's a long time since I restored my CB400/4.

Cheers ...  Ash
Title: Re: Please Help Me Check My Chrome Plating List
Post by: Steve Swan on April 04, 2015, 10:16:49 pm
not seen anything but chrome
Title: Re: Please Help Me Check My Chrome Plating List
Post by: 4pots1969 on April 05, 2015, 05:52:31 am
I also confirms that it is in chrome finish...
Title: Re: Please Help Me Check My Chrome Plating List
Post by: hondasan on April 05, 2015, 02:38:04 pm
Not sandcast related, but since you mention it Ash.... my 400-4, with just 3000 recorded miles when bought 35 years ago definitely had (and still has) a bzp finish brake caliper spring.

CB750 definitely chromed finish.

Chris R.
Title: Re: Please Help Me Check My Chrome Plating List
Post by: ashimotok0 on April 28, 2015, 08:19:33 am
Just bought a Genuine Honda CB750K0 spring from David Silver and it is chrome plated and yes I agree Chris, 400/4 spring  was BZP.

Cheers ....Ash
Title: Re: Please Help Me Check My Chrome Plating List
Post by: markb on April 28, 2015, 01:39:39 pm
I have edited my original list.  Thank you guys for being so diligent.
Mark
Title: Re: Please Help Me Check My Chrome Plating List
Post by: ashimotok0 on September 14, 2015, 02:41:18 am
I cleaned up my cam chain tensioner housing recently on my 10/69 diecast  and the adjuster bolt and nut appear to  be chrome plated. Any thoughts on this.
My bike had many non-standard parts on it when I got it, so possibly not original finish.
Title: Re: Please Help Me Check My Chrome Plating List
Post by: 4pots1969 on September 14, 2015, 05:25:53 am
No chrome on the clamp screw nut, just zinc plated... ;)