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02 crf450R broken balance shaft gear????

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I have a 02 crf450 it has a 511 stroker kit and I was riding it at the local sand dunes all weekend high speed high RPM the last day I was in 5th gear and pop hole in case packed up came home pulled clutch cover off the balance shaft gear came apart I have not fully disassembled it yet but there is no other damage to any other parts that I can see any ideas of what happened? thanks

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You'll have to take it apart further to find out, but an 02 being wrung out with a 511 kit sounds like cases may have just gotten weak from metal fatigue and failed. Really doesn't matter tho.

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