O.S. Engine 12XZ(P) Lightweight Competition Engine  [OSMG1990]

Precision 1/10 Power from the O.S. Engine 12XZ

In 1/10 on-road racing circles, the O.S. Engine 12XZ stands out for its engineering focus and race approval. It has been developed to meet the demands of experienced hobbyists and club competitors.

Designed for Usable Torque

By reworking the crankcase and liner port geometry, the 12XZ improves torque delivery where it counts most. That translates to stronger exits from corners and better driveability around varied layouts.

Structural and Thermal Improvements

• Low-Friction Crankshaft: A specialised surface treatment cuts friction and helps extend component life, and the silicone-filled shaft smooths induction characteristics.
• Precision Balance: Tungsten counterweights provide better rotational balance, which aids stability at high engine speeds.
• Optimized Cooling: The outer aluminum head is machined with ventilation holes to reduce mass and promote faster heat rejection during extended runs.

Tuning with the 12F(B) Carburetor

The included 12F(B) carburetor has been tuned to match the 12XZ character, and with the RP6 glow plug it gives consistent combustion across a practical rpm spread of 5,000 to 44,000.

For racers who prioritise weight savings and a broad usable rpm band, the O.S. Engine 12XZ is a well-balanced option that supports consistent lap times and straightforward tuning.