jetting with sparks pipe

[FreeStylerEx]

I just finished my build on my 450r, and I installed the cam full sparks big core pipe. and have alot of jets. well I orginally put a 175 jet in "sparks recomended" and it started to shoot blue flames out and bogged out so bad! Now I put a 180 in and it runs alot better but still backfires a little bit. I have a needle with the clip on the 4th groove from top. Now the airbox lid is off and it is a 06 so it has the fcr carb. Please help me, its stressing me out!

[pro-rider46]

do you have a hrc needle. if not get one. nice upgrade from stock, and put it on the 3rd clip, then see how it does, where is you elevation

[FreeStylerEx]

i have a dyno jet needle and its on the 4th clip. Im close to sea level im in Virginia

[pro-rider46]

well dyno jets needle has 7clips right? so your in the middle at 4. so thats about right, do you have your airbox lid off, and a aftermarket filter?

[FreeStylerEx]

yep, uni filtter, lid removed. Maybe the fuel screw needs to be adjusted? I closed it then opened it 3 full turns. How will I know if my jetting is percise?