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Ricks426

Discolouration on Crank Throws

6 posts in this topic

I took apart my 2000 YZ426F everything looks good inside, but on the crank throws right above where the connecting rod joins to the journal, looks like it got high heat at one point. it has red and blue swirls like the header pipes get. Is this common, or should I really be worried about it. This is a high hour bike and I don't want to put hundreds or even thousands into this motor...

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I believe those heat marks are from when the rod was installed onto the crank at the factory.

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its normal ignore it! Tried to find a pic from some old threads but couldn't. They come that way new.

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