I had the same with mine. I bought it and 1 month later it started knocking. It wasthe rod bearings. If it is them in your case then pull the engine and check them make sure the rod bearing caps in the right place,where you pulled them off from. check the main bearing too. Befor you put the new rod bearings on make sure there are no groves in the crank. Make sure you put the caps back in the orignal place they cam from
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