Engine will not fire, on compression stoke will not pull.Have checked plug spark this is ok. When plug removed, movement is correct. It is as if there is too much compression.I have de-coked and checked valve movement which appears to be ok. Have also checked stop system which appears ok. please help

Howard Mitton, August 2009

Have you checked whether the flywheel key has sheered. Sure sounds like your problem.

John, September 2009