SOHC.co.uk Forums > CB500/550

camshaft valve timing

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bigmockuk:
Hi all, just how easy is it to mis-align the cam sprocket by one tooth when doing a rebuild? considering the sprocket has no marks or would this matter? Im used to singles/twins but first time on a four.I had no 3 spitting back thru the carb before dismantle,lapped in all valves which were`nt that bad! so working backwards to find if a P.O made a mistake?

Bryanj:
The Marks are on the cam and crank and yes its easy to get one toth out and yes it matters a lot

Trigger:
Spitting back thru the carbs can be a problem with the carbs sucking air. Check the carb rubbers first. If they are OK then you will have to strip the carbs. Know of a CB550K3 doing this and it was a split in the brass tube in the float bowl.

bigmockuk:
Thanks guys,when i say no3 carb was spitting back i actually had the air filter box off at the time,had just set float heights and was checking for leaks when i noticed my palm getting wet when turning engine over or would be normal with the air box off? half expected no3 inlet valve had a bad seat but all was well

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