SOHC.co.uk Forums > CB750

top end oil feed problem

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adriangsmith:
Hi all,
I've had to strip my engine down (750 F2) as it got a little warm and i thought had partially seized whilst i was syncing the carbs and tweaking the mixture settings.
So engine out of bike, cam cover off and the right hand side of the camshaft was bone dry.
removed and cam tower and end of cam shaft have worn away and torn each other up.
continued top end strip down and found no further signs of damage.
however there are some metal fragments in the sump pan so think a full strip down is needed now to find the cause.
so gutted as i was 90% complete on my build.

So my question is where and how does oil enter the top end of the engine? and why would only the right hand end be dry? the rest was well covered with oil and never had the oil pressure light flicker at all during running.
Also now need another camshaft and cam tower. my cam shaft is stamped up R2.

yozzer74:
Is one of your oil metering jets blocked

Trigger:
yep, sounds like a blocked head jet. Cam towers can be line bored but, you have to metal spray and grind the cam to fit ;)

Mike on a bike:
Yep these bad boys snapped my cam. Pull them out and check them. A is out. B is in place, so easy to miss them.

adriangsmith:
Thanks all.
Will check these out this evening.

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