There is a knocking sound when I first start the motor at low idle, when and I shut it off and sometimes at the moment of engaging blades. It seems to come from the motor. Once the motor is running at max throttle, it sounds fine. Blades are tight, deck is clean, all belts seem fine and tight and the pulleys seem fine. I can pull up and down a bit on the crankshaft, but it has the same play as my newer 30" mower so I guess this play is normal. Any ideas? Oil level is fine, oil is nice and it doesn't smoke. Only at startup sometimes.
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