O.S. 81FS-a 34810 4-Stroke Engine OSMG0981

O.S. 81FS-a 4-Stroke EngineOSMG0981

Features

• O.S. 81FS-a 4-Stroke EngineOSMG0981

• Mounts easily in the same space as the FS-70SII with no modifications.

• A rubber O-ring on the muffler's multi-positional manifold helps prevent oil leakage.

• The specially designed lubrication system eliminates the need for crankcase ventilation.

• The 60RA carburetor is equipped with a venturi that reduces the chance of fuel leaking out onto the cowl, while also creating more positive air/fuel flow.

Specifications

• Displacement: 0.809 cu in (13.26cc)

• Bore: 1.091" (27.7mm)

• Stroke: .866" (22mm)

• Weight with Muffler: 19.63oz (556g)

• Practical RPM Range: 2200-12,000

• Output: 1.3hp @ 11,000 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�

Package Contents

• O.S. 81FS-a 4-Stroke Aircraft Engine, carburetor, muffler, header, type F glow plug, manual

Requirements

• 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 or 14x6-7