FEATURES: Single RINGED piston and cylinder sleeve Includes the Silent muffler (SUPG1561) with exhaust stack Schnuerle porting Twin-needle carburettor One-piece crankcase Two crankshaft ball bearings

INCLUDES: One Assembled GS40 Ringed Engine w/Carb. One Muffler, Gasket, Mounting Nuts, Bolts, Brass Pressure Fitting, and Exhaust Stack. One Glow Plug (SUPG1200) One Set of Instructions, Parts List, and Decals

SPECS: Bore: 21.5mm (.846") Stroke: 17.8mm (.701") Weight w/o muffler: 372g (13.05oz) Weight with muffler: 541g (19.1oz) RPM Range: 3,000-17,000 Displacement: .39 cu in. (6.46cc) Power Output: 1.15 BHP at 15,500 RPM Width between centers of mounting holes: 42mm (1.65") Length between centers of mounting holes: 19mm (.75") Width of crankcase excluding mounting flanges: 34mm (1.34") Length from backplate to front of drive washer: 80mm (3.15") Height from bottom of crankcase to top of head: 84mm (3.31") Crankshaft size: 1/4-28 Suggested prop size: 9x7, 9x8, 10x5, 10x6, 10x7, 11x4, 11x5 breakin: 10x6 Carb Settings: H-2-turns out from closed position. L- Take carb off, rotate and look at bottom side. Turn trottle until wide open, set tip of low end needle half-way across cat eye.

REQUIRES: Fuel with 5%-15% Nitromethane and 17% or greater lubricant content (all the fuels we carry meet this requirement). Prop