alright so ive got a 09 sm with rs4 pipes i bought used. PO had not jetted the bike but did the 3x3 mod. when i got the bike it backfired like crazy (shotgun backfiring) on decel, reving, all that. it also started up without the choke when cold. i played with the a/f screw before jetting and turned it in just a bit and it stoped backfiring on decel, but then it started backfiring whenever i left off throttle from 1/2-3/4, so basicly when i upshifted or just roll off the gas. now i have a jd jet kit installed and its still doing the same exact thing. i feel like the powerband is a little more smoother overall but it still cranks over cold with no choke easily, and pops when rolling off the throttle. specs are 300 ft elevation 160 main blue jd needle 3rd clip 25 pilot 2.75 extended fuel screw 3x3 mod rs4 yoshi pipes carb was completely stock before jd kit anyone with rs4s tune their bike? seems like its running rich on pilot and maybe a tad lean up top. inputs?