Hi Jack, Is the sound constant through the entire rev range or does it come and go? If the knocking is constant there is a probability it is caused by incorrect and loose valve adjustments. If the sound comes and goes it will most likely be a defective bearing, if the sound is from the top of the engine, it could be a dudgeon pin bearing (Otherwise known as a small end bearing) It connects the piston to the connecting rod. However there are many other components which may result in similar sounds. Regards John
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