for a long life on the 3.3 run her a little rich get that performance tune then richen back up a tad the 3.3 has a tendency to snap the rod when its tuned for performance and your really pushing the motor. Main thing on motor USE AFTER RUN OIL EVERY TIME YOU PUT IT UP FOR THE DAY. and b4 adding ARO (after run oil) make sure all the fuel is burnt from the case even when it dies from running out of fuel there is still fuel in the case. Start it up until you dont get any fire then add ARO. Make sure you periodically check your clutch bell bearings and shoes.