i have a 686 raptor and i have a yousie full system, K&N lid is on to help keep water out for ice racing. i have live at 7000 ft and have 150/148 for jets the needle clip is all the way at the top and i have a studdering problem when under steady acceleration, the problem dosen't start untill after idle and clears up in the upper ranges. What changes yall think i should do, ia tryed 145/140 with diffrent needle positions and it did not get better so i changed to 150/148 and it got better but it did not go away, i have tryed all the needle positions with this jetting and where i have it now is where it is best so far.

Thanks Yall
Dannan Wagner
Pro Quad #98

 

You do know that the bigger jet gose in the right side carb. I am running a 170/175 jets in my 686 raptor. If you are running to rich try taking your air filter and air box lid off and ride it around and if it runs fine than you know that is running to rich. What dose your spark plug look like? If its a white color than its to lean and you need to go up, if its a black color than your burning to rich.