YZ450 Crank rebuilding

2 replies to this topic
  • MXRose3

Posted February 16, 2016 - 01:19 PM


I've rebuilt plenty of two stroke cranks before, but I'm stumped by the 4 stroke big end bearing pin.   It has two small holes in one end.   Does it matter which side crank web it gets pressed into?

I can't see it making much difference in terms of weight offset.    Just curious if anyone has done there own cranks on these bikes.


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  • grayracer513

Posted February 16, 2016 - 02:00 PM


Yes, it makes a difference.  Those are the oil passages that lead to the rod bearing.  They go into the RIGHT side crank axle/flywheel, where they align with the groove in the inside of the pin bore that carries oil up from the right side end of the crank.

  • MXRose3

Posted February 16, 2016 - 07:52 PM



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