I have a banshee that seems to run pretty good, but am having an odd problem. When I run the motocross track at mid to 3/4 throttle it runs pretty smooth and feels as if the jetting is dead on. However, when I run the drag strip and am full on throttle 90% of the time. Within two passes on the drag strip the mid range begins to run real rough and bubble real bad. IT almost sounds to me like the bike is running to rich and when the throttle is dumped wide open for extended periods of time it runs fine but if I back off the throttle the fuel gets backed up and causes the engine to get choaked down with too much fuel causing a rich condition. Could my needle size be off or could I just need to tune the mid range to restrict fuel flow? I'm running the trinity 2-into-1 carb. -Thanks!

 

add the 160 jet