I just purchased a Pro Circuit exhaust and K&N ProFlow for my new Banshee. I live in St. Louis Mo and was wondering where I should start off with Jetting. I did not buy Jet Kit planned on just going to Yamaha and buy some factory

 

What jet is in it stock? Are you going to be running with the airbox lid on or off?? If you run no lid I would probably start at 180 and go from there depending on how the quad runs and what the plugs read.

 

Stock is 200's, I would start a 260's and go from there, I'll bet you'll be at 280's when dialed in probably! And change the pilot jets from 025's to 030's, My Banshee it running 340's mains and 035's pilots
with Pro Circuit pipes with alot more goodies in Michigan, Your area my be different depending on altitude and sea level affecting jetting I hope this helps you.

 

you sont need to change the pilots till you get different needles, you will probably be about 270 or 280's at sea level you would probably be around 300or 310's. later

 

Go will 300 mains, third clip on the needles.