jetting?

[blasterrider123]

does any one know wat the jetting is for a gutted stock silencer on a 2000 400ex it woud be a big help thanks

[mojoe2878]

i dont know for sure if you would need to rejet for that or not.
pull the plug and see what it looks like, if its white or looks like it needs a rejet then you would probably only need to go up to a 150. maybe try a 40 or 42 pilot for easier starting or just back the air/screw needle out some.

[cals400ex]

a keihin 150 mainjet should do just fine assuming your air box has no modifications.