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Yz250f blue exhaust pipe

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Hi guys I attached a pic of a used 2011 yz250f i bought . The bike doesn't get much use , it starts and works fine . I read up on blueing of exhausts due to heat. But I'm not sure if mine is getting too hot . I do feel the heat by my leg . Is there anything I should worry about ? Running too lean/rich?

 

The blueing seems to run quite a way to the join on the exhaust.

 

I've haven't seen any other yz250f will this much blue !

 

Thanks for your help

Karl

IMG_4092.JPG

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Btw it was like this when I bought it , so I'm not sure if previous owner left the choke on too long and it got like this , maybe I should try to clean and see if it comes back ? How do I clean tho ?

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