7 flights old BME 102. Not an EVO. In cowl stock mufflers, Aeroworks 33% 330L not the arf. Prop 26-10Menz S. Lawnboy 32-1. Every flight motor sags off and sounds like its running on 1 cylinder. Since 1st flight we put a plate in front of diaphram, changed plugs, sent ignition back to C&H where the coil and plug wire was replaced. Initial start up 6300RPM. Down hill from there. Currently backed off high end to 6000RPM. No change! Great transition, all obvious gone over a dozen times. After flight temps left cylinder 140-right cylinder 185-200. At idle motor shakes and plane is a dog...My old BME-100 will smoke this engine. BY the way its not the needles. Any hints before we sent back motor? Thanks Walt