This is the one David Silver initially bought for his museum (after the Mecum bike). I think he bought it off Craigslist but I much preferred the Mecum bike for it's originality, other than the novelty value of VIN 750 and of coure a 3 digit VIN. The last time I saw it in his museum it still had the generator cover stamped SOHC !

He replaced VIN750 in his museum  with a Vic Word restoration, which he bought at auction in the UK.

I think the place very near to him geographically and selling VIN 750 (UNIT 1 Motorcycles)   in the UK,  has close ties with DS, as a few of his imported bikes and the odd ex-museum bikes seem to end up there for sale.

https://www.ebay.co.uk/itm/283801601601

I have been working on the electronics for Caswell Europes semi-pro electroplating tanks last week and had to 'phone them to discuss this. I asked about removing 2-part epoxy sealer and got the impression that their remover is primarily for removing the older type non-epoxy type sealers, prior to using their epoxy resin sealer

I think you would need something pretty aggressive like the boiling THF (tetrahydrofuran) I mentioned earlier. Thinking back we had the electronics  module to be stripped in the reagent in a glass vessel, which was connected to a refluxer to recover the vapour. As described in the attached, which I cribbed and pieced together,  from a book on epoxy resins, any stripper will only soften the epoxy and it will particulate,. It will not fully disolve it. It ended up like crumbly Cheshire cheese when I was stripping it ... altough I understand in the USA all cheeses are just one type 

 ...See attached for some stripping technical details plus some avialble reagents  in the USA but I don't know  if they are still available.

I bought one Eric the Vietnam guy years ago and it was me that instiated him selling 'raw' i.e polished but not chromed.
I had the blade rechromed in the UK and very pleased with it. Really as ChrisR says the beaded outside looks more like hand formed but overall I was very pleased.

Interestingly at the time I bought it , he thought I was a woman as my 1st name is Ashley and that can be a girls name in the USA (Ashley was also the name of the wimp in 'Gone with The Wind') but I digress.  Anyay he got quite chatty with me and told me that he also had a press tool for the double-cut front fender, which was funded by a Japanese based company but he wasn't allowed to sell any  made using the tooling direct. He was also making CB750  4 into 4 exhausts at the time .

The best I could find is Alodine 1000/1001 but it contains chromic acid which is pretty nasty stuff. http://www.henkeladhesivesna.com/henkeldocs/oilgas/10400_LT-6267.pdf (please scroll down to Page 30 and further)
 
There is no suggestion that this is what Vic uses but I would imagine it would work very well.
Personally I just thoroughly cleaned the alloy  with acetone after 'satinizing' the surface  and then used Eastwood Diamond Clear ( as suggested by MarkB)
Not that this coating is ideal but  the best non-nasty method for the amateur.

I should have asked Vic about this  at the David Silver CB750 event last year when he looked at and positively identified,  the pair of PP carbs I had. I must say what a lovely decent 'chap' he is when you meet him face to face.

I only studied one silencer (muffler) closely but it was stamped HMCB750....The type fitted to early diecasts for German and possibly other non-US,Non-UK bikes. I could be wrong but I think these were the pipes fitted when it was auctioned. Owner not remotely interested in the pair of original(confirmed) carbs I had from it and showed him. This is all  a real shame. I can just picture Mr. Swan crying into his beer (and rightly so) when he reads this post.

Shimpei has been there as long as i know, seems to be kind of the face of Yamiya to us round-eyes.  despite my attempts to strike a convo with him, no luck have i.

https://www.pressreader.com/australia/old-bike-australasia/20160701/282016146593357

Thanks for the replies guys.

I sent this reply copied below to Yamiya,so they might refuse to sell to me in future   as they get tetchy when you question the quality of a part.

I guess I am stuck with them now !

Two thoughts:-

1) Try to get somebody in the UK to build up the bottom area with hard chrome and grind back to the correct size.
2) Bush the bottom piston with 0.1 mm shim and make some new undersize I.D. damper rings at work. Not sure what the damper rings are made of though and how hard the material is.

What do you guys think please ... I really appreciate your help.

David Silvers stanchions are made in Italy, fully chromed and the diameter is too large to fit the pistons and valve rings. I find it incredible that nobody in 2018 can manage to copy a part faithfully to the original.  It makes you question what the actual metal the stanchions are made from

Ashley Derrick <ashimoto750@gmail.com>
09:03 (8 hours ago)
to shimpei, order

Dear Sir,

Thank you for your reply but I cannot understand why the dimensions of the pipe are not a faithful reproduction of the Honda original part. In my opinion these pipes have not been made to the correct dimensions. Can you check your stock to see if they are the same dimensions as mine please.

Kind regards and best wishes ...Ashley