Jetting

[Ag400exRider]

I have an hmf slip on competition series pipe and k&n air filter on an 07, I have a 165 jet in right now with the air box lid on. Is tht right?!

[russellsroost31]

did u mess with the fule/air mix screw and the 165 sounds a lil rich id say 160 to 155 with 4 to 5 one inch holes in the airbox lid

[Ag400exRider]

Yes I turned it out like 2 and 1/2 turns and if I leve the 165 in and get a pre filter instead of the lid would tht be ok?

[Drfat400ex]

That sounds pretty rich, but it all depends on the bike, so nobody can tell you if it is or not, but do a plug reading, if it's chocolate brownish then it's perfect, white is lean and black is rich. Also a pre-filter does absolutly nothing to your jetting.

[chevymanrick]

Yea I agree that sounds pretty rich honestly, u should be around a 155 main, how does the bike run at wot?

[ajw2685]

My set-up is in my sig and I only need a 162 with an airbox lid that looks like swiss cheese.

[Drfat400ex]

Yeah I'm running a k&n, t-4 slip on, and a k&n powerlid and I'm running a 155 main.

[Ag400exRider]

I had the 160 in it and the plug looked like I was a Lil white so I put the 165 in it and now spark plug looks ok but to me it feels a little sluggish, would to much fuel make it sluggish?!

[chevymanrick]

Yea to get an accurate plug reading is difficult there is a certain procedure, if u look under the stickys at the top of the forum I believe there is instructions how to properly do a plug reading on your main jet, but it sounds to me that you are to rich I'd go back to your 160 if that one felt good or if u wanted u could try a 162, see if the sluggishness disappears..