300ex main jet size for hmf slip on pipe

[redrider09]

hey i order a HMF slip on pipe yesterday and want to no what size main jet i should use i will be runing with air box lid off and a K&N filter please help thanks

[skyhighatv]

the main jet is a 122 i beleive. i have a 250x w full supertrapp shorty/tc pipe and a k&n, im currently running a 140 main,runs good.no lid on air box.

[red rider88]

the supertrapp on the 250x sounds great thts wat i run

thnks for the pic greg

[300exOH]

Originally posted by redrider09
hey i order a HMF slip on pipe yesterday and want to no what size main jet i should use i will be runing with air box lid off and a K&N filter please help thanks

I am running a 135 main, stock needle and 42 pilot on mine with a sparks x-4 and a modded airbox lid. You may be able to get jetting info from HMF's website or by calling them.

[hardkoratvmxr]

i am running a k&n closed air box and just hmf slip on with 125 main jet and 2nd neelde clip from bottom

[redrider09]

thanks for the info i already have a k&n jet kit and it has a 124 or 128 so i think im goin go with the 128 thanks for your help i cant wait to get my pipe on thanks

[ethanp87]

i would run the 128 might need a 130.