i have a 06 450r with a k&n filter and white brothers mx4 slip on, the pipe came with a 180 main jet but my stock one is only a 120 i think thats to big of a jump it ran sluggish at the end of the gears with the 180. what size jet should i use?

 

did you adjust your fuel mix screw when you put the 180 in?

 

Check out this post It wil helpClick here

 

no i didnt but i put a 135 in it for the time being it works fine for now. but thanks