SOHC.co.uk Forums > CB750

Inlet valves

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UK Pete:
Here you go paul,  http://www.ebay.co.uk/itm/150406958929 he does all sorts of goodies for the F2
and silvers stocks the standard valve guides as well, i bought all my stuff at dynomans then i discovered this guy at half the price   (ARSE!
how badly pitted are the lower stems, it might be ok to still use them, can you post a picture
Pete

UKROBK7:
I can recommend Cyclex as well.  Just watch out for the customs duties!  I had to pay an extra

K2-K6:
As the others are saying the F2 is probably a good deal more critical than a Mini motor in this area and although four-stroke principles are related, you are unlikely to get two motors more different than these.

I understand that a good part of the flow in the F2 head is affected by the dimensions of the valve seat angles and without being particular in this area other stuff can't produce any really measured improvement from a basically std motor.

Standard mini heads are by comparison very poor for performance so gain is easy as the head is a significant restriction.

The F2 motor went up only by about 5bhp from previous models with all that Honda could do to it (valve size, rev increase, cam lift and timing, carb changes)  I'd seriously doubt that any small changes could make any gain on that but more likely to loose some if not at least meeting a good production spec.

pauliexjr:

--- Quote from: UK Pete on October 05, 2011, 08:58:43 AM ---Here you go paul,  http://www.ebay.co.uk/itm/150406958929
--- End quote ---
This guy is the dogs wotsits! Less than 12 hours to reply to my enquiry 'will they fit stock valve guides' and a price of around

UK Pete:
All the good guys seem to be in the USA,
As for the frame mod there are a couple of options , the best one is the gorden frame kit found on the other sohc forum, but there is also my own version of the frame mod  which is a real cheap way of doing it for less than

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