Specifications: Stock Number: DLEG0020 Displacement: 20 cc (1.22 cu in) Bore: 1.3 in (32 mm) Stroke: 1.0 in (25 mm) Weight: 28.9 oz (820 g) RPM Range: 1,750-9,000 Output: 2.5 hp @ 9,000 rpm Requires: Gasoline, 2-cycle oil, ignition battery & propeller Includes: electronic ignition, muffler, spark plug, gasket, bolts, throttle arm extension & manual Suggested Propellers: 14x10, 15x8, 16x6, 16x8, 17x6 Suggested Break-in Prop: n/a Technical Data: Ignition Battery: 4.8-8.4V NiCd or NiMH, 6.6V LiFe or 7.4V LiPo pack (Voltage regulator required with LiPo or LiFe pack above 8.4v) Compression Ratio: 10.5:1 Gasoline/Oil Mix: 30:1 Replacement Spark Plug: DLEG2126 Weight Breakdown: Engine: 22.9 oz (650 g); Muffler: 1.8 oz (50 g); Ignition: 4.2 oz (120 g)