04 YZ450F cutting out in 4th

It only does it when I'm in 4th gear. I can redline 1,2,3, and no cutting out once I hold the throttle steady in 4th it starts to cut out really bad. I can punch it and it wont cut out but as soon as hold the throttle steady it starts to cut out. Any ideas? thanks. :)

Tps? Maybe it's going bad. :)

that happened to me too !! on my yz450f , 2004.. it happened on the highway when i was goin to the track i couldnt keep a steady throttle position and i changed the jets and runs great i think it was cause im at sea level or something ike that but its jetting

which jets did you install ? thanks.

I'm running the James Dean kit with the stock pipe, and the stock pilot jet. Run the recommended main jet/ needle and clip pos. per your alltitude and it should run sweet. Mine runs crisp as hell. It's well worth the $$$ imho.

I'm running the James Dean kit with the stock pipe, and the stock pilot jet. Run the recommended main jet/ needle and clip pos. per your alltitude and it should run sweet. Mine runs crisp as hell. It's well worth the $$$ imho.

how much does the jd jet kit run??

and does it still work good on after market pipes??

oooh man i dont know

what jet i put in there sorry !! i took it to the mechanic and he put another one in there and messed with the carb alil and now its puuuuuuuurfect ! :)

Thanks for the info, a buddy of mine also recommended the James Dean as well.

Just cut back on the main. You are just slightly rich. Cutting out under more load is normal in higher gears and not lower ones if you are just slightly rich. :)

thanks for the info will try cutting back on the main. :)

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