O.S. Engine OSMG0981 81FS-a 60-Size 4-Stroke Powerplant  [OSMG0981]

Give Your 60-Size Model a Reliable 4-Stroke with the O.S. Engine 81FS-a

The O.S. Engine 81FS-a, model number OSMG0981, is designed for pilots who want more robust 4-stroke performance in 60-size aircraft. It fits the FS-70SII mounting footprint, allowing straightforward installation while improving overall engine output.

Sealed lubrication and fuel management

The 81FS-a uses an internal lubrication layout that removes the need for crankcase breathing, which simplifies servicing and keeps oil where it belongs. The supplied 60RA carburetor with venturi helps regulate air and fuel flow to reduce the chance of fuel reaching the cowl. The muffler manifold includes a rubber O-ring to minimise oil escape at the exhaust joint.

Key fit and performance points

With its thoughtful engineering, the O.S. Engine 81FS-a is a practical choice for flyers who want a cleaner running 4-stroke with dependable power delivery.