[400ex carb on a 300ex] - ATV Riders Forums - Honda, Yamaha, Suzuki, Kawasaki, Polaris, CanAm, Arctic Cat, Kymco ATVs

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400ex carb on a 300ex
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Posted by: jsmith2232

The 300 is all stock except a k&n filter and powercore 4 pipe, is it possible to put the 400's carb on it and do you have any jetting suggestions? I'm tearing her down tomorrow night so any suggestions asap would really help alot, thanks.

Posted by: blasterfreak99

yes it will fit and my bro is using the stock 400 jetting (that or one or two sizes leaner). just make sure to play with the needle jet to make sure it isnt leaning out. my bros was lean on the needle circuit and almost perfect on the pilot and main circuits so you'll just have to do some testing

Posted by: SET THE STAGE

i have one on mine, unfortunately it came with it so i don't really know anything as far as the jetting specs go. sorry

Posted by: quadracer420

Yah you can do it, IIRC it went in very snug in the intake boot on the motor. I had mine jetted at 170 I think. your best bet is to get a lectron flatslide.