Fireballs!

[ridehonda400ex]

Okay so i jetted my fourwheeler over the winter for my HMF pipe and its got a 152 main and stock pilot and needle. But now its warming up and i got some black smoke and fireballs every once in a while and when it idles and i hammer the throttle it will bog. Would a 150 main be a good idea? My pipe doesnt have a quiet core. Just the spark arrestor

[atvextremerider]

Originally posted by ridehonda400ex
Okay so i jetted my fourwheeler over the winter for my HMF pipe and its got a 152 main and stock pilot and needle. But now its warming up and i got some black smoke and fireballs every once in a while and when it idles and i hammer the throttle it will bog. Would a 150 main be a good idea? My pipe doesnt have a quiet core. Just the spark arrestor
On the hmf web site it says to use a 165/170 Keihin Hex

[ridehonda400ex]

That would be wayyy to rich. And i only will buy Original Kehein Jets

[crownandmonster]

How many turns are you out on the A/F screw?

[honda400ex2003]

3.5 turns out on the /a and put a 150 in it for anything over 40 or 50 degrees and you should be good to go.

steve

[ridehonda400ex]

3.5 wont be to much? its stock pilot

[honda400ex2003]

you will be fine with it unless you have to go more than that. any more than 3.5 and you will need a bigger pilot. steve

[ridehonda400ex]

Thanks steve. Ill give it a shot