i need help
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Then you have the later motor.There was talk of some misaligned crankplate holes,contamination(metal going through it)or just fatigue from unbalanced crank.Crank mainbearing failure is fairly rare I would just try to eliminate any contamination sources either get crank balanced or buy new one and put it back together.I have been using the ballbearing mainbearings rather than stock but I didnt have enough time on motor to be able to recommend them.How did your oil and filter look?
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