O.S Marine inboard engine has water-cooled cylinder head. One-piece crankcase. ABC construction. Ball bearing-supported crankshaft. Rear Exhaust (rear exhaust points toward front of boat). Schnuerle Porting. Rear rotor intake. New type #40A carb. This product incudes one assembled engine. One instruction manual and decals.

Fuel with a lubricant content of 16% and a nitro content between 10%- 20%. Glow plug, the O.S. #8 is recommended for 5%-25% nitro fuels).
Header, Flywheel, Joint, and Tuned Pipe
IMPORTANT: A .65-.90 size tuned pipe MUST be used with this engine. Using a smaller tuned pipe will cause engine failure.