SOHC.co.uk Forums > CB750
Original Finishes CB750K0 engine PLUS CB500 Four
AshimotoK0:
Thought I would start a thread with the finishes on the original CB750 Engine. Please comment. and please add later model finishes if you know them
Crankcases ... Silver painted
Head ... Silver painted
Barrels ... Silver painted.
Clutch cover ... polished then clear coat
Alternator cover .. polished then clear coat
Transmission ('mission') cover ... polished then clear coated
Rocker cover ... polished then clear coated.
Cam chain adjuster housing ... Silver painted.
Oil filter housing ... Silver painted
Breather cover ... Silver painted ?
plus on cycle parts:-
Wheel hubs F & R plus rear sprocket carrier ... polished then clear coated ?
Fork leg sliders ... Polished then clear coated
Brake caliper arm and holder ... Silver painted ?
Brake caliper housing ... Silver painted
Top Yoke ... Black satin painted
R & L bar switches ... black anodized
Front brake M/cyl & cap... Black anodized
Any thoughts on surface prep on the aluminium? The 'Alodine' aircraft style treatment looks the dogs B but pretty nasty stuff as it contains chromic acid and some treatments contain hydrofluoric acid .. again nasty stuff. We don't want to become one of Nurse Julie's patients do we ::)
kettle738:
Hi Ash, here's my opinion for what it's worth, everything on the engine as you suggest, but I think the smooth breather cover and cam chain tensioner housings had low gloss silver.....which I suspect will just be lacquer over the same paint applied to the rest of the engine.
Cycle parts, as you suggest, but I have never seen unmolested hubs with a true polished finish between the spoke webs....plain cast bright alloy on the rear hub with polishing limited to the outer surface of the spoke webs and the same on the front, no polishing of the centre part of the hub, just the outer webs.....the central portion, as far as I know is bright matt alloy with a thin layer of lacquer over the whole thing.
Wheels that have been 'restored' are usually blindingly obvious because the entire hub gets a mirror polish.
Fork sliders, polished and lacquered, but with that very fine brushed effect that is so hard to replicate.
Brake caliper....silver paint.....not sure about the arm, it looks like barely polished on the top surface and matt elsewhere, possibly just with a coat of thin lacquer, but I'm far from sure.....I doubt they would put any finish at all on the face where the caliper mounts.
It might be an idea to throw some part numbers into Google to see if there are any decent pics out there of NOS parts; failing that, take a look at the SOOC site, the high res pics of an unrestored bike, and the caliper in particular which is photo number 25... even then it's a bit of a guess. Further to that, photo #41 shows the rear hub finish very well
Can you get access to that 500 mile unrestored UK bike....or get someone to take some appropriate pics of it? Failing that, brochure pics or contemporary road test photos might give you a clue.
Just my opinion of course, but I do like anorak detail, so I'm happy to be proved wrong if there is something to learn.
Mick.........kettle738.
PS Are you going to get your switches and M/Cyl black anodised?
Trigger:
Very hard to get lacquered to stick to a high polished finish, lacquer needs the surface to be keyed the same as paint ;)
AshimotoK0:
Cheers for that Mick, just the kind of input /feedback I need. I will try and get in touch with Bob Heath who owns the 500 miler plus the Dave Silver Mecum Auction Museum bike only has around 2.5k on it and it was ex-private collection/museum. Bob takes a while to answer emails though. Glad to hear your thoughts about the hub finish as I didn't know what to do about the centres but your observations are in keeping with my 1969 CB350K1 import bike, which was stored indoors and retains all of it's original finishes. It too has clear lacquered finish hubs , semi polished on the faces but unpolished on the inner 'ribbed' section. Do you reckon that the crankcase lower half was painted, I suspect it was but turns out that the CB350K1 I have had silver painted upper/bare aluminium semi-polished finish as original.
Agreed on the brush alloy finish on the fork sliders, I have warmed to blingy chrome but I hate highly polished alloy on 60's/early 70's Hondas ...it just doesn't look right. How about the tappet caps .. what do you reckon on those?
I agree this is all anoraky and there will be many on here who think our obsession is a form of madness but It's a hobby for me that keeps me sane in a weird sort of way.
Unsure on the black anodized finish, may just paint them using the 'Wyatt' method.
AshimotoK0:
--- Quote from: Trigger on September 10, 2015, 09:22:53 AM ---Very hard to get lacquered to stick to a high polished finish, lacquer needs the surface to be keyed the same as paint ;)
--- End quote ---
You need very nasty chemical treatments to do that Graham ... like Vic World uses.
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