O.S. 12XZ(P) Speed ABC engine with 12FB slide carburetor has specially coated silicone filled crankshaft with precision ceramic bearing that greatly reduces wear and friction, plus a Tungsten weight for added balance at higher RPM. Meets IFMAR regulations. Machined aluminum outer head with holes drilled for lighter weight and better cooling. Newly designed crankcase and liner port for increased torque at low to mid speed. New 12F(B) slide valve carburetor designed to match power characteristics of engine. ABC cylinder liner construction, "A"luminum piston with "B"rass liner that is "C"hrome plated.

Fuel: 10-30% nitro content, 20% recommended for break-in
Exhaust System: Depending on vehicle
Air cleaner assembly, glow starter and track equipment.

Some notes on Slide Valve and Rotary Carburetors:
Rotary Carbs offer a larger response in the middle of the power band. This works well for off-road applications when throttle response must be varied. Slide Valve Carbs provide greater response at the beginning and end of the power band. This works well for on-road and racing applications for fast take-offs and high speed.