FEATURES: Same mounting dimensions as the O.S. Max FS-70 Surpass II Ideal fit for 60 size planes Fuel pump delivers fuel consistently to the engine at all times regardless of aircraft's attitude and fuel level Specially designed lubrication system eliminates need for crankcase ventilation 61R carburetor with attached regulator F5030 muffler with rubber O-ring in multi position manifold to help prevent oil leakage

INCLUDES: O.S. 81FS-a P 4-Stroke Aircraft Engine, carburetor, muffler, header, type F glow plug, PD-08 pump and instruction manual

REQUIRES: Fuel: 10%-20% nitromethane with 18% lubricant. Synthetic, castor, or a synthetic/castor lubricant blend may be used. NOTE: Certain four-cycle fuels cannot be used due to low oil content. However, SOME four-cycle fuels such as the Wildcat 4-Cycle 15% (CATP9109) may be used due to its 18% oil content. When choosing fuels for this engine, be sure to select a fuel with at least an 18% lubricant content. Propeller: Sport and aerobatic scale 13x7-9, 14x6-7

SPECS: Displacement: 0.809 cu in (13.26cc) Bore: 1.091" (27.7mm) Stroke: .866" (22mm) Weight with Muffler: 22oz (624g) Practical RPM Range: 2200-10,000 Output: 1.28hp @ 10,000 RPM Height from Bottom of Mounting Tab to Top of Crankcase: 3.8" (97mm) Width of Crankcase below Mounting Tabs: 1.6" (40mm) Center of Mounting Holes Same Side: .83" (21mm) Center of Mounting Holes Opposite Side: 2" (50.8mm) Center of Front Mounting Hole to Drive Washer: 2.2" (55.5mm) Center of Rear Mounting Hole to Drive Washer: 3" (76.2mm) Center of Crankcase to Center of Needle Assembly: 1.4" (35.6mm) Center of Crankcase to Outer Edge of Needle Assembly: 1.8" (45.7mm) Muffler Angle in Relation to Engine: 10°

Carburetor Needle Settings: Needle Valve, 1-1/2 - 2 turns open from fully closed