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it is one of two problems - your engine uses a cam with a plastic gear - this gear has a tendency to move - it will probably need replacement . there is also a chance that the valve seat is coming loose (overhead valve ) which keeps the valve open - check the distance of the valve stems to make sure they are both out the same distance if they are not then when you put a new pushrod in and adjust it the valve will be pushed too far and hit the piston in turn bending the pushrod
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