ATTN: 400ex riders with HMF exhaust

[Bush0102]

What size main jet are you guys using? I have my airbox lid on and i'm currently running a 182. I'm going to drop to a 172 but i was wondering if maybe a 165 or so would be better

[hondarider2006]

I was running a 155 with my lid on...any more mods besides your slip-on?

[Bush0102]

K&N, and i use an outerwear

[sickmojave]

I run a 155k with 4 ~1" holes in lid.;)

[cals400ex]

we ran around a keihin 152 with a slip on and K&N. we are at 625 feet above sea level. however, the jetting does change as the temperature changes.

[T.Hopp]

155 main. Sea level, HMF slip-on, Twin Air filter, 6-1" holes in lid and degree key. I tried a 160 and it didn't like it.

[PHIL_B54]

see my sig...open top alum. air box, approx 700ft above sea level

[journeyman]

im runnin a 152 with a 42 pilot with a uni air in a 05 400ex.