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I may be way off base on this, but I thought i read somewhere that those valves leak, to repair use a pushrod and lapping compound to smooth the seat where the ball sits. evidently what happens,(not to me but,) oil from the tank siphons down to the crankcase when let set idle for some time. The ball in the seat is supposed to prevent this. I've heard of stupid ideas like strecthing the spring to cure, but the fault is at the ball and seat. More pressure does nothing but reduce oil from getting to your motor when it is running. my .02.
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To Ride, Shoot Straight, and Speak the Truth
Col. Jeff Cooper. RIP