O.S. Multi-Cylinder 4-Stroke engine has pushrod-driven overhead valves.Ringed pistons. Gear-driven camshaft. 5 -crankshaft ball bearings. 2 -camshaft ball bearings. Four cylinders (flat, 2 opposing 2). Firing Order: 1-3-4-2. This product includes one assembled FF-320 4-stroke engine. One set of instructions, decals and poster. One choke valve. Four glow plugs. One motor mount. One safety prop nut assembly. One glow plug extension harness. One spare woodruff key.

2-STROKE Fuel with 5%-15% nitromethane and 16% MINIMUM oil content. (All 5%-15% fuels we carry meet these requirements). DO NOT USE 4-STROKE FUELS!!)