SOHC.co.uk Forums > CB750

unusual modded engine SOHC?

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K2-K6:
Have a close look at the bottom, then the top.

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See what's been done?

Bryanj:
Shame there are no internals

Laverda Dave:
Interesting. Did I read somewhere in the distant past that Honda used the sohc bottom end but with a dohc top end for the 850(?) RSC racer in the late 70's and early 80's? Is this one of those bikes.
Or just maybe I've been soaking in Christmas brandy for too long today 🎄🤕

K2-K6:
Yes Dave,  the RCB was built on CB750 bottom end but had bespoke barrels and twin cam head that made the first iteration 16valve endurance racer.

That one had cams really close together as in this photo

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Then came the later RSC1000? (think that was it's designation) which was development of production 900 twin cam road engine that was the CB900 but a completely different engine to the SOHC.

That first post here seems to have grafted on the CB900 type head onto CB750 SOHC cases, which I've not seen before. So they appear to have made a hybrid out of production motors. 

The brandy is not playing tricks  :)

Laverda Dave:
Thanks for update Nigel (you really should think about writing a book with all your knowledge).
Looking at the original photo again I can now see what you mean. Whoever is building the bike is spending some ti. E and money and hopefully the internals will be added soon as Brian mentions.
Where did the photo surface from and how old is it, it may actually be running by now?

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