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Discussion Starter · #1 ·
hello people new to the site, I have a 2009 400x i bought brand new and last year i installed a big gun full exhaust and K&N air filter i also bought a dyno jet kit and installed the required jets but after that it wasnt running that good so i took the jets out and put stock jets back in, and this was last year ive been riding it alot and i just dont want to damage the atv from not having aftermarket jets. if anyone knows what jets would be good or any advice would be much appreciated. thanks
 
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