O.S. Engine OSMG0525 25FX Non-Ringed ABN Motor with Muffler  [OSMG0525]

Balanced 25FX Power for Tight Mounts

The O.S. Engine 25FX Non-Ringed with Muffler provides a compact, well engineered option for model pilots. Identified by part number OSMG0525, it focuses on a low mass design with performance-minded features.

Schnuerle Porting and Bearing Support

Schnuerle porting helps the engine breathe efficiently across the rev band, improving combustion. The twin ball bearings on the crank reduce internal wear and contribute to smooth throttle response. The ABN non-ring cylinder helps keep weight to a minimum.

Tuning Options and RPM Range

The side exhaust supports muffler or tuned pipe setups to suit different flying styles. With recommended props from 9x5 up to 10x5, the engine covers a practical rpm band between 2,500 and 19,000 for a variety of models.

Physical Dimensions and Fitment

Compact at 75.6mm long and 248g, the 25FX is easy to locate in snug cowls and benefits from a side exhaust that simplifies plumbing and placement.

The O.S. Engine 25FX is a solid choice for pilots who want a compact engine with flexible exhaust options and steady performance for both sport and aerobatic flying.