MOTOR OS 25FX COM ESCAPE 12660

O.S. has Updated the .25 SF with this New High-Performance .25 FX.

This Engine may be used in Sport and Aerobatic Aircraft. The FX is Designed to Use a Muffler or Tuned Pipe. Comes with a 2-Year Warranty.

FEATURES:

Remote Needle Attached to the Backplate keeps fingers away from prop

Twin Ball Bearing-Supported Crankshaft

Schnuerle Porting (Schnuerle scavenging)

Advanced Bi-Metallic Liner. This process uses a double layer of plating material, rather than one thicker layer. This helps the metal to bond to the cylinder, and is more durable. Also, the plating process is more consistent, resulting in a more precise fit between piston and sleeve, for better compression, longer life.

Side Exhaust

One-Piece Crankcase

INCLUDES:

One Expansion Style Muffler

One Set of Instructions, Decal, and Poster

One Assembled .25 FX w/Carb

SPECS:

Displacement: 4.07cc (.2485 cu in)

Bore: 18mm (.708")

Stroke: 16mm (.630")

Horsepower: .84 BHP at 18,000 RPM

Weight: 248g (8.8oz) 10.8oz w/muffler

Length: 75.6mm (2.98") distance from the backplate to drive washer

Width: 30mm(1.18") width of engine neglecting engine mounting flanges 38mm (1.50") distance between centers of the mounting holes

Height: 75.5mm (2.97")

Crankshaft Thread Size: 1/4-28

Recommended Props: Pattern Flying: 9x5, 9x6

Pattern Flying if a tuned pipe is used: 9.5x5

Sport Flying: 9x5, 9x6, 9.5x5, 10x4, 10x5

Practical RPM Range: 2,500 - 19,000 RPM

REQUIRES:

Long Glow Plug (O.S. #8 recommended)

Fuel with 18% (minimum) lubricant content and 5%-15% Nitromethane (All 5%-15% fuels we carry meet these requirements)