[jetting a yz400f/ 400ex] - ATV Riders Forums - Honda, Yamaha, Suzuki, Kawasaki, Polaris, CanAm, Arctic Cat, Kymco ATVs

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jetting a yz400f/ 400ex
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Posted by: accorracer

i have a 400ex with a yz400f motor, 41mm fcr carb and hmf slip on exhaust.

the problem is it won't start or idle with out the choke pulled out so i know i'm lean

can anyone give me any idea of a base line jetting i have what seems to be 3 jets in this carb the sizes now are 52,52, and a 160

is this close to what anyone else is running?

Posted by: accorracer

really needing pilot jet info m,ore than anything

Posted by: drue4mpg

i run a 45 pilot

Posted by: accorracer

damn i got a 52 in there and i still have to have the chocke pulled for it to idle at all