XT crank web showing heat, normal ???

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katana

Grey Hound
Joined
Dec 5, 2011
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Location
Calvinia
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Yamaha T7
I just pulled the barrel on my 550 engine.  The bore isn't too worn and the piston still looks newish.  I have ordered a new set of rings that I'll fit after a hone.  

I noted a blueish colour around the crankpin on the webs that looks suspect.  A quick google search gave me a pic I can post as I do not have photo options today.  This is for a 2nd hand ebay part that looks the same.  

Any experts that can tell me why the colour is there?

:thumleft:
 

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