OS Engine FS40S Ringed 4-Stroke w Muffler

This is a FS-40 Surpass Four-Stroke Model Aircraft Glow Engine. / / FEATURES: Rear-mounted updraft carburetor / 30% larger intake valves than the original FS series / Helix gear-driven camshaft / Ringed piston / Ball bearing-supported camshaft and crankshaft / Two year warranty / / INCLUDES: One Assembled engine w/Carb and #F Plug / One Muffler w/Manifold / One Set of Instructions, O.S. Poster, and Decal. / (Wrenches, Choke Valve Extension, and Mounting Template Are No / Longer Included per O.S.) / / REQUIRES: Fuel: 5%-15% nitromethane with 18% lubricant. Synthetic, castor, or / a castor/synthetic 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, the modeler must be sure to / select a fuel with at least a 18% lubricant content. / Starting and Field Equipment. / Propeller (see SPECS) / / SPECS: Bore: 21.2mm (.835") / Stoke: 18.4mm (.724") / Power Output: .65 BHP at 12,000 RPM / Weight- w/o muffler: 12.5oz (354g) / with muffler: 13.3oz (377g) / Practical RPM Range: 2,200 - 12,000 RPM / Crankshaft Thread Size: 1/4-28 / Valve Clearance: Between .04mm and .1mm (.0015" and .004") / Measured between the valve tip and rocker arm. / Length: 77.5mm(3.05") from backplate to the front of the drive washer / Width: 32.5mm (1.28") width of engine neglecting the mounting flanges / 42mm (1.65") side-to-side mounting holes on-center / Height: 98mm (3.85") / Suggested Prop(s): 10x7.5, 11x6, 12x5, 12x6 (2-blade), 9x7 (3-blade) / Construction: Aluminum and aluminum alloys