zero shim gap

Kevin Hollis kh at
Sun Jul 11 07:44:01 PDT 2010

Hmmm, I have oil all over a plug and an exhaust shim gap of zero.
Does that imply that the valve hasn't been closing and hot gases have 
burnt into the guide causing oil to seep in ?

Also, while I've got the top off, how can I check cam chain wear ?


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