Jet recommendations for 2005 400EX

[waxer]

This thing is stock except for a K&N filter and outerwear, and an HMF slip on exhaust (sport), what jets do you all recommend I get from the dealer to really get the most out of things?

Thanks...

[400exrider707]

Lid or no lid?

[waxer]

Will that really make any difference on a stock motor other than getting the filter dirtier quicker?

Currently it has the lid on it, but if its better to have it off, I might go that route as well.

[6858-400ex]

here in az i have a 165 main but i may go to a 160

[sickmojave]

yes it makes a difference.

with the lid I would try a K155. that's what I run with 4 ~ 1" holes in the lid but I run a stock filter ;)

[04'400ex'er]

lose the lid and start jetting with a 155 main and a 40 pilot. that should be fine on the pilot but you might need a 160 on the main.

[muddy400EX]

im runnin a k&n filter/outerwears with a 165 main. i used to run a lid on it but when the weather started to get hotter it started poppin and sputterin real bad. so i decided to take off the lid and it ran MUCH better! i would to run with no lid, and maybe 160 or 165 main

[waxer]

155 and 40. Does anyone know what size jets come stock?

Is swapping the jets difficult at all?

[muddy400EX]

Originally posted by waxer
155 and 40. Does anyone know what size jets come stock?

Is swapping the jets difficult at all?


my stock main was 148

[sickmojave]

148 main and 38 pilot are the stock sizes, and no it's not hard to do..;)

BTW I run a #40 pilot and think a #42 would work better.. most people use the #42

[Colby@C&DRacing]

I just jeted an 05 the other day with those same mods. 40 or 42 pilot 160 main runs great. With the lid on