Sparks exaust jetting

[thibs101]

Gooday i just bought a stock 2008 450r and love it! so i decided to get a exaust for it and the nices sounding one was the curtis Sparks. in the instruction it says to put a 175 main jet in your carb but that seem fkn huge jumping from a stock 120 to a 175. i was also told to try 150-160 but im not shure which way to go.. iv never done this kind of stuff befor and id apreciate it if some one couyld guide me in the proper direction. bough a uni ari filter and runing lid but may take it off if it preforms beter.

thx for reading!
Marc T

[xcrider]

Call curtis sparks they can set you up.

[eastside 400]

165-175 main jet, 42-48 pilot with the fuel screw 2-2.5 out from fully in. 55 leak jet. With the lid off the airbox

[thibs101]

thank you sir il try that i apreciate it!!

[thibs101]

i tried the 150 jet it leaned it out badddddd so i put the 175 lie you said and took the air lid off and its works great!!!!!! kinda woried about not having a air lid on it but well see how she hold up. thanks again bud!!