CARB Tuning

Jetting is determined by intake and exhaust, how much air gets in and how it flows out. Baffles in the exhaust hold back pressure on the exh. valve giving more lower end torque as you reach the power band. Popping or back fire while backing off throttle is a sign of exhaust leak near the exhaust pipe meets the cylinder head, air is leaking in the pipe and lighting the unburnt gasses, change your exhaust gaskets and torque the pipes at the head before clamping or tightening rear pipe mounts. The best way to rejet is on a dyno with a master tech. Good luck! B)