SOHC.co.uk Forums > CB750

top end oil feed problem

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royhall:
You may need to spread your search for a cam tower far and wide. This has been a common problem over the years so supply of these parts is not great. Took me a month to locate one for mine. Not just the jets that block either, check that the drillings through the cam tower are clear as they block at the cam journals. Good luck with the rebuild.

AshimotoK0:
I have one spare 750 cam tower but not giving it away for free on here, as I normally would, 'cos it cost me in the 1st place !

If you are interested PM me but I won't have access to measure/mic it up  it up till Tuesday now

Trigger:
You are lucky you don't have this type of CB750K jet, which doesn't even have a part number ;)

adriangsmith:
Well, I found the cause of the jet blockage today.
one single grain of sand stuck in the top of the jet!
This was so hard i thought someone had snapped a drill in the jet at first.
it took some shifting but eventually came out.
Put it under a microscope at work and a grain of sand is what it looks like, which is possible as the outside of the head was caked in it when i got the bike.
Just goes to show how careful and clean you need to be when reassembling one of these engines!

Now has anyone got a cam for an F2 engine and is it different from an F1 or K series cam?

Bryanj:
Any cam will fit and run but the F2 had the most aggressive profile after the original CB750

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