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View Full Version : 2003 400ex carb tuning


250exkid
04-01-2008, 05:14 PM
ok do i turn the air/fuel screw in or out and what does what to richen it and lean it? my machine is back firing on deleration. so is that to lean? THANKS!!!
250exkid
04-01-2008, 08:36 PM
BUMP
TRXRacer1
04-01-2008, 08:51 PM
You turn it out to richen and in to lean.
250exkid
04-02-2008, 08:10 PM
kk thanks
400sEXridr
04-02-2008, 09:04 PM
back firing on decel sounds lean to me
250exkid
04-03-2008, 06:37 PM
ok so i should back the screw out to richen it and it should help?
400sEXridr
04-03-2008, 06:53 PM
yeah that should help a little bit