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View Full Version : z400 hmf jetting


MoToX199
03-15-2006, 04:08 AM
i just ordered a hmf slip on for my 400 and i cant wait to get it on! but my question is i need to get jets for it but idk which ones to get,i allready have a K&N with the air box lid on,so what jets do you recommend? and do i have to adjust the needle? thnx for any help!

p.s. i called like 5 different places and they all told me differnt jets to run so thats why i am confused and postin this up here
MoToX199
03-15-2006, 01:00 PM
no one?
sandfighterz
03-15-2006, 07:18 PM
Originally posted by trick400ex
i just ordered a hmf slip on for my 400 and i cant wait to get it on! but my question is i need to get jets for it but idk which ones to get,i allready have a K&N with the air box lid on,so what jets do you recommend? and do i have to adjust the needle? thnx for any help!

p.s. i called like 5 different places and they all told me differnt jets to run so thats why i am confused and postin this up here

if you leave the air lid on i would go to a 160 165. but i would recommend you take the lid off and run 175
chazekxt
03-15-2006, 10:45 PM
when i had my z400 i had a hmf slip on white bros power filter and 1 two inch hole in lid i ran a 165 dyno jet in mine i think a 175 would be to bigg we are about 1175 ft here in ks.
YFZ450Ridr
03-15-2006, 10:45 PM
i run no air box lid, uni filter, and a white bros slip on and i have a 175 main.
chazekxt
03-15-2006, 10:46 PM
and i had stock needle too
MoToX199
03-16-2006, 04:02 AM
so you didnt have to adjust the needle? also does it make a differnce that i have a K&N and you had a white bros? i dont think it owuld cause that big off a differnce,thnx for all the help though
MoToX199
03-28-2006, 03:05 PM
i talked to thr hmf guys and they said 145 main this doesnt seem right with what you guys are sayin so could someone please help me out here?
JW450R1
03-28-2006, 04:59 PM
if u want max. performance go with the air box lid off.what type of jet kit is it.call them.hmf uses diiferent jet sizes if your using dyno jet.the sizes are different.
MoToX199
03-28-2006, 07:02 PM
i prefer to leave my lid on,im goin to orde a jet direct from my dealer so them w/e then give me then,im not goin to use the dyno jet kit
JW450R1
03-29-2006, 07:03 PM
there is a difference in the after market needles to.the taper for the bigger jets.
MoToX199
03-30-2006, 03:54 AM
most likely is goin to be mikuni and i ride in alot of dusty areas so i would like to leave it on