OS FS-91 Surpass 4-stroke engine with pump unit has the new rear-mounted updraft 60N carb w/pressure regulator. New rear-mounted PD-07 pump unit. Helix gear-driven camshaft, supported by ball bearings. Ringed piston. Does Not use choke valve, but instead an electric starter to start. Grease-packed twin-sealed corrosion-resistant rear ball bearing. Two year warranty. This product includes one assembled engine w/carburetor. One #F Glow plug. One Muffler w/Manifold. One set of instructions, O.S. poster, and decal. (Wrenches, Choke Valve Extension, and Mounting Template Are No Longer Included per O.S.)

Fuel: 5%-15% nitromethane with 18% lubricant. Synthetic, castor, or a synthetic/castor lubricant blend may be used. NOTE: Certain four-cycle fuels cannot be used due to low oil content. However, SOME four-cycle fuels such as the Wildcat 4-Cycle 15% may be used due to its 18% oil content. When choosing fuels for this engine, the modeler must be sure to select a fuel with at least a 18% lubricant content.
Starting and Field Equipment.
Propeller (see SPECS)