Need Jetting Help

[Jekyl_22]

I know this kinda stuff gets old, but.... does anyone have some jetting recommendations for a 400ex that is bored out to a 440, high compression piston (11:1), White Bros. Track Cam, and modified stock exhaust (5" silencer and ground out header welds)? I am absolutly clueless when it comes to jetting. The jetting is still stock...:rolleyes:

[Silverfox@C&DRacing]

Try a 165 main and a 42 pilot.

[Narly R]

Hey whats the stock jetting in those?


Man figuring out what jetting in my bike is such a PAIN!!:mad: But I finally gots to test it out yesterday and I broke my chain!:D

[Jekyl_22]

You broke the chain? That sucks!

So how do I know if the jetting is right or not?

[Narly R]

hmm well on a 2 stroke go to where you think it will be a little fat and then go down to where it feels and sounds good. I enden up at a 158-160. Are ya at like a 155-160? Lets say your at a 155 Id say go to like a 163 or so!:confused: Good luck and hopefully well be going this weekend!:rolleyes: