SOHC.co.uk Forums > CB500/550

Very odd oil leak

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Nurse Julie:

--- Quote from: SteveW on April 18, 2020, 05:10:42 PM ---Breather pipe is fine.

This possibly sounds far fetched, but could oil get past the valve stem oil seals. Then down the valve and back all the way into the carb bowl. Then leaking out of the carb bowl seal?

The rest of the carb is clean, it’s just the bowl that has oil on it.

--- End quote ---
I don't think that could happen but if you pull the plug out of cylinder #1 the combustion chamber would have to be full of oil to confirm your theory.

SteveW:
I’ll have a look tomorrow and take some pictures. It’s doing my head in  :(

JezzaPeach:
Have you put oil down the throttle cables?

JezzaPeach:
Also is there oil on the gear shift shaft? And presumably the chain cover is on?
My shifter shaft seal was leaking and was finding its way to the chain and all over the sump

SteveW:
Throttle cables have not been oiled and gear shaft seal is new.

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