SuperTigre"s G-51 ringed engine may look small, but contains a lot of power. The G51 gives your .40-sized model extra gusto for exciting climbs, loops, and snaps. *** 3-YEAR Warranty *** FEATURES: Specially machined crankcase gives increased output Schnuerle ported Crankshaft supported by two ball bearings INCLUDES: One Assembled G51 Engine One Muffler and Header Assembly One Glow Plug (FOXG1400) SPECS: Bore: 23mm (.905") Stroke: 20mm (.787") Power Output: 1.48/15,500 RPM Practical RPM Range: 2500-15,500 Weight w/o muffler: 363g (12.73oz) 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: 87mm (3.43") Crankshaft size: 1/4-28 Suggested Prop size: 10x6, 9-1/2x6 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. COMMENTS: This engine now uses a nut and long bolt to hold the exhaust stack to the engine (Replacement Muffler Screw Set is SUPG4785). They NO LONGER include BOLT-ON style Mufflers with this engine. FUEL: 18% oil content MINIMUM. A synthetic/castor blend is highly recommended. 10%-15% Nitromethane works well. Higher levels of Nitro may require adjustment of the compression ratio to prevent detonation. upNMH 9/14/03 updt jxs 2/04/04 ir/jl MAF4/29/99 *updt*wm 3/21/06 6/01/06 updt lmm 3/26/09