06 yz 450 Crank Question

I did a top end nik the cyclinder, piston&rings timing chain. I noticed that the crank had alot of heat indication were the rod connects to the crank at the bearing (discoloration), I was wondering if this was normal? The rod had no play up and down and very slight side to side and rotated smoothly.

Edited by STR8SHOOTR

Piiiccctttuuurrreeesssss

The heat bluing around the crank pin is a result of the original manufacturing process. The procedure for measuring bearing/pin wear is outlined in the manual. A dial gauge is used to measure the amount that the small end of the rod can be rocked side to side without the big end sliding on the crank.

The heat bluing around the crank pin is a result of the original manufacturing process. The procedure for measuring bearing/pin wear is outlined in the manual. A dial gauge is used to measure the amount that the small end of the rod can be rocked side to side without the big end sliding on the crank.

Thanks again Gray!

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