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I have an 05 kx250f, a lot of people say it's crap but mine runs great. It backfires a lot after having it in high revs, is it normal?

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I see the problem on your bike pic, take that breather pipe off the tank cap and throw it far away, and get a proper breather pipe that routes up into the frame.

 

Those aftermarket pipes dont breath and cause a vacuum in your tank so you dont get fuel through and the bike runs lean till the carb manages to fill again.   

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