[kfx-400] - ATV Riders Forums - Honda, Yamaha, Suzuki, Kawasaki, Polaris, CanAm, Arctic Cat, Kymco ATVs

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kfx-400
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Posted by: buck naked-r

what is the stock jetting on the kfx-400

got a friend who bought one used and it came with a dyno jet style main jet>[160]...needle on 4thclip.......but the lid was off and now the screen in the tail pipe was taken out.

where trying to get the jetting close.......also has a k&n filter

where at sea-level between 20&100ft above

i tried a 170,but i think it was way rich....tip of the pipe was very black.

oh and what is stock gearing on a kfx-400........this bike has 15/37-on 22"tires....and it doesn't want to pull 5th

Posted by: indyZrider

stock is a 135 mikuni jet. you can probably put thae needle on the 3rd clip and drop it to a 155-160. gearing is 14-40 on 20" tires. that thing is geared for serious high speed. hope this helps.