O.S. Engine 55AX  [OSMG0556]

Increase displacement inside 40-size model the simple method: simply fall in a 55AX engine! You'll enjoy more horsepower for moving larger props ?X this means improved 3D, accuracy and sport flying. In addition, there's no modifications needed!

Mounts in to the bolt pattern for a 46AX.

A diagonally-placed needle eliminates the necessity for a remote needle valve.

The 5-sided, angular head design seems great and especially increases area area for better cooling.

Specs:

• Stock quantity: OSMG0556
• Displacement: 0.545 cu in (9 cc)
• Bore: 0.91 in (23 mm)
• Stroke: 0.85 in (21.5 mm)
• Practical rpm: 2,000-17,000
• Output: 1.75 hp @ 16,000 rpm
• Body fat: 14.3 oz (404 g)
• Includes: #8 radiance plug, 40J carburetor, energy Box E-3070 muffler
• Suggested Props: 12x7, 12x8, 13x6, 13x7