New to the forums and need some help jetting a 2003 CRF450R carb on a kart with a 450R motor on it. Looking for some help or advice. The motor doesn't act like it has any pop when you hit the throttle. To me it acts real lean and hesitates for a second on restarts. Then it takes off and gets above 5k its fine and then we run wide open at 8500-9500.
No airbox just k and n filter.
fmf mega bomb exhaust
stock cam for now.
pro circuit springs and valves.
alt: 800 feet Alabama
Stock pilot
stock needle
main 190
Thanks