counterweight discoloration

[yam 3]

I had a base gasket leak first off. Pulled the cyclinder to replace and i noticed that the counterweights had some discoloration where the crank pin goes. I do not recall seeing this before. There is no up and down play in the crank and very little side to side play. I was really wondering if this was normal or not. The bike is a 2002 yz250 w/an FMF pipe and boyeson pro series reeds, other than that it is stock. I am also noticing some carbon in the intake not a lot just a very light "dusting".

Thanks in advance

 

[Rich Rohrich]

The bluish discoloration on the crank is a normal part of the manufacturing process. It's nothing to worry about.

 

[yam 3]

Thanks Rich!!!!!! A little piece of mind goes a long way!!!!

 

[jmics19067]

if it is not too late just see if you can look in the oil slots of the bearing to make sure the the bearing itself isn't blue to double check.