426ex jetting issues

[xtullyx16]

I jus built a 426ex with the following mods-

hmf full exhaust
modded lid (holes on top)
k'n airfilter
10:8 comp wiesco piston
stage 1 cam
175 main 50 pilot Needle clip 2nd from bottom


when my motor was stock with the following mods-

full hmf
modded lid
k'n airfilter

i was running 155 main 42 pilot stock set needle and it was ripping

any ideas of where i should go or what to try?? it just seems to be a turd (slow)

[tsargent4]

try a 160-165 main jet, your pilot is way too big, stay with the 42, and your needle clip should be on the 3rd of 4th...

[mxduner]

Originally posted by xtullyx16
I jus built a 426ex with the following mods-

hmf full exhaust
modded lid (holes on top)
k'n airfilter
10:8 comp wiesco piston
stage 1 cam
175 main 50 pilot Needle clip 2nd from bottom


when my motor was stock with the following mods-

full hmf
modded lid
k'n airfilter
ditch the stock carb and get an fcr.My bro put a ct 425 kit in and it barely beat a stock machine.trust me we tried every jetting combo, and some one on here told me to do this, and it made a HUGE difference.

i was running 155 main 42 pilot stock set needle and it was ripping

any ideas of where i should go or what to try?? it just seems to be a turd (slow)

[spanky426ex]

im not sure on your jetting but i have a 426 with the following mods i have stage 2 cam full port and polished head 13.1 compression full yosh pipe, the bike ran great then decided to put a 450r carb and im tellin ya that is the best thing you can do for power is gave that basturd some more air and fuel. i got one off e-bay bout 3 years ago for 150 bucks.

[Balaz_73*00]

42 pilot 3rd clip position and like a 145-150 main...had a similar setup and worked great for me