do any of you guys have an hmf slip on for a 400ex? if so what main jet works best for it? i just want to know because i was thinkin about gettin one but i dont want something that i am going to have to put a real big jet in.

 

Why not? A bigger jet means more power!

 

it also means more fuel consumption

 

I've got a HFM slip on, on my 400, and I love it...it's loud as **** with no quitecore...

HFM sent a 170 Main with it. I put it in in the winter and it ran great. In the heat of the summer, (it's 85+ here) it bogs at the very top end...more like a stumble...

I dropped the jet to a 162 and it hits hard now.

I have a K&N filter, no lid, 14 tooth front sproket...that's about it for engine mods...oh yeah, I'm at 600 ft above sea level.

Do it!!!

Here a pic

http://forums.atvconnection.com/photos.cfm/ID/2514/#TOP

Peace
Willfulone

 

thank you, i think ill get the hmf

 

with the air box lid on and no other mods to the bike, i would run a keihin 152-155. the larger you go, the less power you will have. it will be most noticable on top speed. a 170 is just too big imo.

 

I like my HMF[img]i/expressions/face-icon-small-wink.gif[/img] oh and I'm running a #155 main jet

 

could i run a 152-155 if my only other mod was a K&N air filter?

 

a 152-155 should be good if your only other mod is a filter...

 

Hey Much2Fear, im 15 years old and have a 400ex too in cali. And it seems we like to go to the same places MSG me on AIM at HyperGuy050! [img]i/expressions/face-icon-small-happy.gif[/img]