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View Full Version : jetting a yz400f/ 400ex



accorracer
08-03-2006, 08:38 PM
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?

accorracer
08-04-2006, 03:50 PM
really needing pilot jet info m,ore than anything

drue4mpg
08-06-2006, 06:09 PM
i run a 45 pilot

accorracer
08-08-2006, 07:22 AM
damn i got a 52 in there and i still have to have the chocke pulled for it to idle at all