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View Full Version : Is is possible I need a 180 main jet?


Steven
10-12-2002, 02:18 PM
Has anyone heard of a 440EX needing as high as a dynojet 180 main jet?

The reason I ask is because I did another plug check after a 10 second long 5th gear run at wide open throttle.

This time a had the dynojet 175 main in and when I pulled the plug, it looked like I could go richer yet.

Also for the first time today, I got a little backfire after playing around at part throttle for about 2-3 minutes. This means I need a richer part throttle setting right?

I'm at sea level and I run 100 octane race gas.

Thanks, Steve.
Sick0
10-12-2002, 05:07 PM
May be with 440 and thw cam.
01_400exrider
10-12-2002, 05:52 PM
Steve how much diff is your 440 vs your 400?
CAIN730
10-12-2002, 05:54 PM
Never seen the k&n jet kit but does it come with a new pilot jet? The pilot jet only controls starting and very low throttle but keep in mind that at wide open throttle the pilot circit is still working so a larger pilot jet will slightly affect your W.O.T. mixture. Try a 42 or 45 kehin pilot jet.
Steven
10-13-2002, 03:11 PM
Huge difference.

Anybody have and first or second rate knowledge of jetting with the below set up?

Steve
Bean
10-13-2002, 03:16 PM
race gas makes a plug burn white, fyi

also, try the 180, if it bogs, drop back down
DEAL
10-13-2002, 07:14 PM
If your at sea level Yes you probably will need a larger jet.
Steven
10-14-2002, 05:32 PM
Anybody, else have advise?