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View Full Version : 400ex jetting?



trailrider894
03-10-2009, 04:21 PM
I'm pretty sure my stock 400ex carb isn't jetted right. I'm at about 873ft above sea level. and it is about 50-80 degrees now . what jets should i run i have a open lid airbox,k&n filter with outwears,white bros-series pipe and curtis sparks timing key and crf timing chain.

Dangerous400EX
03-10-2009, 05:35 PM
With similar mods I am running a 42 pilot and 152 main and throttle response has been great. I have not ran it in warm weather like this yet, but so far it has been great.

Elevation is about the same also

trailrider894
03-10-2009, 05:52 PM
well it is still cold here in missouri. but with warmer weather on the way. i don't wanna re-jet it twice.