O.S. Speed R2104 1/8 Scale Engine (OSMG2025)

Introducing the O.S. Speed R2104 1/8-scale racing engine, a factory-tuned powerplant built for competitive 1/8-scale RC racing. It uses a 9-port piston liner to boost torque in the low-to-mid range and maintains ample power on high-traction tracks, while a redesigned crankshaft counterweight delivers a smooth transition from low RPM to peak performance.

Cooling and durability are enhanced by a heat sink head with wider fin spacing for improved airflow and balance, with anodizing available in black and red for a striking look. An inner head silicon O-ring helps seal out dust, and the proven 21M2(B) carburetor provides reliable fuel delivery across generations. This engine is designed to deliver consistent, race-ready performance on demanding surfaces.