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trouble661
01-23-2004, 06:54 PM
i just installed a wb pipe on my 400ex. it dies when i pin the throttle from idle. is it too rich or too lean?. seems to run ok mid and full throttle. but then i have only ran it down the street a few times. can someone point me in the right direction on carb set up? im about 600ft above sea level and i have the midwest humidity etc.

DantheEXman
01-23-2004, 07:05 PM
go down on eon the main jet. SOmeone correct me if im wrong... Also it could be the air mixture screw on the carb.

2004TRX450R
01-23-2004, 07:27 PM
That would be your idle mixture is to lean. Richen up the pilot screw 1/2 to 1 turn.

sprtrx300ex
01-23-2004, 07:58 PM
Are you giving the bike time to warm up?

Whats your jetting(main, needle, pilot)?

BSTURDIVANT
01-23-2004, 08:13 PM
Raise the needle 1 clip position ( down on clip) and go to 3 turns open on air mixture screw from all the way in seated lightly.

If it still stumbles, go to 45 pilot 2 turns out!

01-23-2004, 09:15 PM
DO Not richen ur mixture, its not ur main jet, its ur fuel screw or ur needle move the clip up and see if that helps also it sounds like u dont let it warm up.

cals400ex
01-24-2004, 01:25 AM
whats your jetting at after you put the pipe on?

yes, i would ride it a little longer to make sure it is fully warmed up.

trouble661
01-24-2004, 09:16 AM
cal.. stock jetting

cals400ex
01-24-2004, 01:41 PM
i would just rejet it like we mentioned on your other posts and make sure the bike is up to full temp and let us know how it works.