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I have found that one intake valve has no clearance.(rear cylinder)The adjuster screw can be adjusted all the way out and the valve, spring retainer, and keepers are resting against the rocker arm. I never seen anything like this. It still runs fine.It is like the valve has worn badly or the seat has. Has anyone seen this before.
 

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Bad seat and valve. These are a hit and miss thing on these kawie motors. Best bet is to take the head(s) off and inspect all valves.
 

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pretty much what he said, the valve is sinking. The main culprit is the valve
 
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