I have a banshee that was just rebuilt last october and only has about 20 hrs on it. It is ported, decked head, v force 3 reeds, cpi pipes and silencers, 320 main. I did a compression test and the left side only has 110 pounds and the right side has 150. the left side doesn't seem to be firing with minimal exhaust coming out the left side exhaust and its cold. Went through and cleaned the carbs and still no luck. Has good spark. put new plugs in, swapped spark plug boots and the problem stays on the left side. looking for ideas before I tear into the motor. Thanks