Specs Bore 1.85 #34; (47mm) Carb Type Reed valve Crankshaft Type Threaded Cylinders Single Displacement 3.7 cu in (61.0cc) Engine (Only) Weight 3.02 lbs (1370g) Power Type Gas HP 6 HP @ 7,500RPM Ignition Weight 3.9 oz (110g) Muffler Type 2-piece aluminum Muffler Weight 3.9 oz (110 g) Oil Type amp; Content 30:1 2-cycle oil mixture Plug Type NGK CM6 Product Height 4.96 #34; (126mm) from center of crankshaft to top of cylinder head Product Length 6.8 #34; (172mm) Product Width 3.54 #34; (90mm) between center of upper mounting holes Prop Range 22 x 10 - 24 x 8 Recommended Fuel 87 - 93 octane gasoline Starter Type Hand Held Starter Stroke .98 #34; (35mm) Total Weight 7.8 lbs (3532 g)