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Just Got a 07 400ex not running cheap.. Got a 87mm cylinder and wisco 87mm 10.1 piston. Got maybe 5hrs on it with easy run time and it runs good.. Stock exhaust with im guessing the po took the baffle out and carb has stock jetting with uni filter and airbox lid has a triangle cut out of it. Never bought a jet kit with any other atv. Just bought jets with peoples recommendations and turned out good.
Im at sea level and what would be the recommended jets to use?
 

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Get on youtube and learn how to chop your plugs. No-one can tell you what your "custom" bike needs for jets. Put gorilla tape over your airbox hole to plug it off (inside and out). I just covered up some holes in one of my 400ex's that the previous owner had drilled. I dont believe the intake of dust is worth any perceived hp gain.

-DallanC
 
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