Craftsman Part #753-06246, Ace Line Trimmer Engine Flywheel | 3.50 x 2.00 x 3.50. This engine flywheel (part number 753-06246) is for line trimmers. Engine flywheel 753-06246 attaches to the crankshaft behind the recoil starter assembly. The recoil starter engages the flywheel to spin and start the engine. Let the engine cool and ... - Craftsman Part #753-06246, Ace Line Trimmer Engine Flywheel | 3.50 x 2.00 x 3.50.