Dont know where the ball came from but your problem does not sound as if it is from the reciprocating part of the engine, sounds more like a dragging revolving sound so it could be from the cam shaft or even parts of the gear system. The only way you will know is to strip it down.photograph step by step to make it easier to re assemble. Anyhow it does not give one much confidence in the lifans products or the company as far as I am concerned.
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