2002 WR426 Cylinder Discoloration

I have been out of riding for about 10 years and just picked up a 2002 WR 426. I was looking the bike over and noticed a discoloration on the cylinder exterior. It's like it's a different metal than the head. Is this normal and if so, what is it? Thanks for any help.




Mine looks pretty much the same way. I think it's the result of different manufacturing processes...I believe the cylinder is "as cast", and the head gets some bead blasting or shot peening to improve material properties.

It's normal.

Thanks guys for your reponse.

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