O.S. Engine #35910 - OS FS-91 SURPASS II-P  [OS-35910]

That's a FS-91 Surpass 4-stroke engine with Pump Unit. Amazing in Box

Features:

• Completely new rear-mounted updraft 60N carbohydrate w/pressure regulator.
• New rear-mounted PD-07 pump product.
• Helix gear-driven camshaft, supported by ball bearings.
• Ringed piston.
• Grease-packed twin-sealed corrosion-resistant rear ball bearing.

Includes:

• One Assembled Engine w/Carburetor.
• One #F Glow plug.
• One Muffler w/Manifold.
• One Band Of Instructions.

Specs:

• Bore: 27.7mm (1.09")
• Stroke: 24.8mm (.976")
• Displacement: 14.95cc (0.912 cubic inches)
• energy manufacturing: 1.6 BHP at 11,000 RPM
• Weight-Without Muffler: 22.9oz (649g)
• Body fat With Muffler: 24.6oz (697g)
• Practical RPM Range: 2,000 - 12,000 RPM

Recommended Prop(s):

• Stunt planes: 11x10, 11x11, 12x9.5, 12x10, 12x11
• Scale models: 13.5x8, 14x7, 15x6, 16x6, (12x8 & 12.5x7-3 blade)