Features

• Same mounting dimensions as the O.S. Max FS-70 Surpass Ideal fit for 60 size planes
• Specially designed lubrication system eliminates need for crankcase
• ventilation 60RA carburetor F5030 muffler with rubber O-ring in multi position manifold to help prevent oil leakage

Includes

• O.S. 81FS-a 4-Stroke Aircraft Engine
• carburetor
• muffler
• header
• type F glow plug
• 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 or 14x6-7

Specs

• Displacement: 0.809 cu in (13.26cc)
• Bore: 1.091" (27.7mm)
• Stroke: .866" (22mm)
• Weight with Muffler: 20.11oz (570g)
• Practical RPM Range: 2200-10,000
• Output: 1.3hp @ 11,000 RPM
• Height from Bottom of Mounting Tab/Top of Rocker Cover: 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 Prop Washer: 2.2" (55.5mm)
• Center of Rear Mounting Hole to Prop Washer: 3" (76.2mm)
• Center of Crankshaft to Center of Needle Assembly: 1.4" (36mm)
• Center of Crankshaft to Outer Edge of Carburetor: 1.8" (45mm)
• Muffler Angle in Relation to Engine: 10°
• Needle Settings: High Speed: 2.5 - 3 turns out from fully closed
• Mixture Control (low speed): Flush with carb body, then 1 turn in.