YZ450f Crank

2 replies to this topic
  • digg1er

Posted May 14, 2007 - 04:11 AM


I've decided to overhaul my 2006 YZ450f. I've removed the head, cylinder, and piston, all seems ok. But I have noticed blue marks on the crank flywheels, adjacent to the big end pin. Is this from manufacturing or is it from overheating during operation?

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  • grayracer513

Posted May 14, 2007 - 06:25 AM


That's heat treating, and is present on all YZF cranks. If it had gotten that hot in operation, the big end of the rod would be blackened, if it survived at all.

  • digg1er

Posted May 16, 2007 - 04:07 AM


Thanks, thought as much, it's local to the bigend pin so probably from heating to allow the pin to be pressed in.

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