I just change the exhaust cam for a Hotcam with au-decomp,everything is set ok and correct valves clearances. I also installed a yz450 '08 carb. Now with my new cam i have to get WFO trottle to get it running...after that it run nice and smooth,nice idlle. If i shut it off,it start on the first kick. But cold it is a pain in the %@#**!*( should i go with a leaner pilot jet!!!