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Valve Stem Seal on Rocker bolt?

Tommiman

New member
Got into some heavy weeds this past weekend and heard a pop then the motor stopped and wouldn't start. After taking off the valve cover found the problem was the exhaust side push rod slipped off the rocker arm. Upon further inspection do to the resistance of the weeds it caused the valve stem seal that was on the bolt to mushroom which allowed the push rod to slip off.

My question is: Is that valve stem seal suppose to be there? Looking at the attached diagram it should not be there. I'm not the original owner and it's a Yamaha 2.5 Four Stroke.

Thanks
Valve.jpg
 
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