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Part number help-YZ Camshaft

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I searched and saw over 80 threads on the YZ cam mod. I read many of them. My question should be simple I hope. I have a 2004 WR450F. What year YZ Exhaust Cam will drop into my motor? I know for a while they were the same part number and then at some point they changed, I just need to know the years to be on the look out for.

2nd question. Did anyone ever find a solution to the E-start problem? I think INDY500 mentioned putting in a 72 Starter Jet...can anyone confirm this and say if it helped?

Thanks,

Mike

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