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Wow this is the real deal 1968 prototype CB750

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AshimotoK0:
https://www.cb750prototype.com/

Bryanj:
There are a couple of diferent posts about that recently on the US forum Ash, what they say makes sense to me in that a running prototype would be there before a pre full production set sent out to tease the dealers but not sure about Honda leting that out of the factory first

Laverda Dave:
Some amazing history and early engine photos in that article. Thanks for posting Ash, great read👍

K2-K6:
Very interesting Ash.

Makes sense that they took it there as soon as something tangible was available to show, what with history of them in USA Honda network asking for a multi cylinder engine to advance from the 450 twin as request from marketing position etc.

The notes say "only CB750" to use accelerator pump on carbs .... probably don't know about the F2 then, and also Keihin made  :)

Interesting about having a Hyvo primary chain on that one only too. Last development of this bottom end, going into RCB racer, went to gear primary drive with a idler intermediary gear to keep the gearbox rotation in same direction too.

AshimotoK0:

--- Quote from: K2-K6 on May 15, 2024, 11:36:48 PM ---
The notes say "only CB750" to use accelerator pump on carbs .... probably don't know about the F2 then, and also Keihin made  :)

--- End quote ---

Yes I though that too .. very complicated carbs too yet the 4 pre-production prototype bikes had 4x modified CL77 carbs sprayed with silver paint!

Not seen anything about the way he came by it ,which is a bit of a shame... but early days yet I suppose. Always nice to know the history after it was shipped to the USA. I guess it must have gone back to Japan at some stage but that's only a wild guess.

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