OS MAX-25FX II (4.07cc), (21L) incl. muffler, # OS12662
As of April 2026 · Prices incl. VAT unless stated otherwise.
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OS MAX-25FX II (4.07cc), (21L) incl. muffler, # OS12662
OS MAX-25FX II (4.07 ccm), (21L) incl. Silencer
# OS12662
The O.S. 25FX II is a powerful 2-stroke internal combustion engine with a side exhaust. The OS MAX 25FX II is the perfect choice for smaller sport, scale, and aerobatic models in the .25 class. The 25FX II features the proven 21L carburetor, which guarantees perfect throttling and easy adjustment. The two-piece 892 silencer is included in the scope of delivery. The exhaust port of the silencer can be rotated to suit the model and the mounting position of the engine.
Features:
- 2-stroke internal combustion engine with 892 silencer
- 21L carburetor
- Perfect control response
- Low-vibration operation
- Easy adjustment
Technical data:
- Displacement: 4.07ccm
- Power approx. 0.62 kW (0.84) (hp) at 18000 rpm
- RPM range: 2,500 - 19,000 rpm
- Bore: 18mm
- Stroke: 16mm
- Weight: 260g
- Carburetor: 21L
- Shaft thread 1 /4 "-28 UNF
- Weight 260 g
- Length to hub: approx. 75.6 mm
- Width: approx. 46 mm
- Height: approx. 75.5 mm
- Mounting hole spacing longitudinal 15 mm transverse 38 mm
- Mounting hole Ø 3.2 mm
- Recommended propellers: Sport: 9x5, 9x6, 9.5x5, 10x5 and Aerobatics: 9x6, 9.5x5
Recommended fuel:
- at least 18% castor oil or synthetic oil (or mixture of synthetic oil and castor oil), 5-20% nitromethane.
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