You need to get the Mikini small round main jets.
P.S. Did you go to Del Amo Motorsports? Don't!!! Those guys completely suck.

 

Did you get yours dialed in? I can't get mine dialed in. I am currently running 165/170 with Sparks ign. advance, snorkel off and BG full exhaust. It doesn't like anthing over half throttle, AT ALL, It coughs and cuts out. I keep reading all these posts but it seems that these people are going back and forth. HELP!

 

Your condition sounds like mine. It keeps cutting out and coughing. With the ign. advance I think I am running to rich @ 165/170 but the plug looks lean, I believe @%$@#.

 

ERICsRAPTOR,
I would have to disagree with you. My bike is pulling hard throughout all the gears. The small problem is that when running at full throttle, say in 4th gear, if I let off just for a split second and hammer the throttle again. It will pop and hesitate and pull hard again. This is why I say it is lean. It runs like a raped ape, other than the slight hicup. I have have done several plug tests and it is still lean. When I made the mods, I installed a new plug. After running for a few hours both at idle and full throttle, the plug ceramic still looks brand new.
I tried 155/160 last night and still looks lean. It is better than it was, has a little color but, I know it is still lean. Tonight, If I can get a chance, I will try 160/165. I'll let you know then.

 

yup, Del Amo counter people and the mechanics have not even seen a Raptor and they don't have a shop manual or scematics!! I will swing by Long Beach today.

 

You might want to consider getting a Dyno Jet kit. Kind of expensive at $83.00 but it comes with several sizes of main jets, lighter slide springs and possibly most important, new needles. The needles have a way different taper than stock and needles can have a big effect on jetting. The kit covers a wide variety of ATV configurations such as type of pipe, altitude, air filter setup, etc. The instructions are good and I think it takes a lot of the guesswork out of jetting this thing. I'm pretty happy with the way it runs.