O.S. Speed B2105 .21 Nitro Engine – 1/8 Off-Road Buggy Racing

O.S. Part #1EK00

The O.S. Speed B2105 is a high-performance .21 nitro engine developed for serious 1/8-scale off-road buggy racing. Designed for racers who want smooth drivability, strong usable power, and dependable performance, the B2105 delivers the precision and consistency expected from O.S. Speed.

Its race-focused power delivery is designed to remain controllable through rough sections, technical corners, changing grip conditions, and long straights. The smooth, linear response helps drivers apply power more effectively while maintaining confidence and consistency throughout a race.

For competitive racers looking for a premium 1/8 buggy engine, the O.S. Speed B2105 offers a strong balance of acceleration, throttle control, high-RPM performance, and race-day reliability.

Key features

-Genuine O.S. Speed B2105 .21 nitro engine

-Designed for 1/8-scale off-road buggy racing

-Smooth, controllable power delivery

-Strong usable power throughout the RPM range

-Race-focused throttle response and drivability

-Built for demanding off-road track conditions

-Premium O.S. Speed engineering and reliability

Specs

Displacement: 3.49 cc (0.213 cu. in.)

Bore: 16.27 mm (0.641 in.)

Stroke: 16.80 mm (0.661 in.)

Output Power: 2.68 PS (2.64 HP) at 34,000 RPM

Practical RPM Range: 4,000–42,000 RPM

Engine Weight: 348 g (12.28 oz)

Free ground shipping!