I have a 2007 yz 450. I recently rejetted it, and it has way better response now, and pulls hard to redline, but every once in a while when i roll onto the throttle(even slowly)it just dies, and is hard to restart(4-5 kicks)used to be 1 kick. I rejetted it because the jets i got in the white bros. kit were ridicolous I ride at about 1500-3000ft. Temps anywhere from 20f to 60f Previous jetting was: 180main:eek: 52pilot 42leak starter jet(stock) needle:#4(stock) White bros fuel screw 2 1/8out Current jetting: 170main 48pilot 42leak starter jet(stock) needle:#4(stock) White bros fuel screw 2 1/4out One more question i have is i plan on doing the o-ring mod soon. Am i going to want to go back to a bigger leak jet?