SOHC.co.uk Forums > CB750

Engine reconditioning - any specialists about

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Yoshi823:
The 750 engine is one of the easiest engines to work on.

I recommend new valve guides made from aluminium/bronze to the standard lengths.Too short and the valves 'wobble' and cause back-to-front bore wear.

I also suggest that whenever anyone has an engine out of the frame to replace the tacho drive oil seal.When this leaks there is nothing that can be done except having the complete engine out...just for this very small seal.

I heard that the pistons and rings to use are the CB350 twin items.I think this takes them out to 65mm bore size and 836cc with a standard stroke....but don't quote me on this as I remember reading this a fair few years ago.

Seamus:
Just for info the CB350 pistons give a volume of 810cc.

How do I know? Cos I have one. Be aware that the compression is also increased a good bit as the CB 350 pistons have a bigger dome (as opposed to the flat pistons of the 750).

SteveD CB500K0:
There are a couple of very good independants around here (Reading) who will work on these old bikes (they actually prefer it)

Let me know if you are still looking.

Steve

mick:
Hi it is possible to replace the rev counter drive oil seal with the engine in the frame  ;) cheers Mick.

Seamus:
It's not supposd to be, but if it is fitted from the outside it could be possible to hook the old one out and replace.

Unfortunately I cannot remember as I did mine with the rocker cover off.

Best advice is have a look and see if you can get it out.

Good luck

Seamus

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