I've got a predator 212 hemi and it doesn't seem to turn the Rpms I think it should. I've tried jetting up and down but doesn't improve. Max rpm I've seen is about 6,700rpms. Motor is on a mini bike with gear ratio of 5.00. 14.5in tires, 75t axle gear, 15t clutch.
Mod list: Arc flywheel 8*...