O.S. Speed B2105 Competition .21 Nitro Engine w/Pipe Combo

Description

Engine Overview:

The O.S.SPEED B2105 Off-Road Buggy Engine is designed for competitive buggy racing, offering enhanced power and drivability. Manufactured by O.S. Engines, this engine boasts a redesigned cylinder and liner with three ports, delivering greater torque from mid to high-end. The black and silver anodized cooling head ensures efficient heat dissipation, while the DLC-coated crankshaft and revised internal shape optimize both power characteristics and ease of use compared to previous models.

The O.S.SPEED B2105 also incorporates a double-seal front bearing for improved durability and stability. Inherited from the B2104 crankcase, the engine features ceramic bearings and a specially treated thrust plate to reduce wear and enhance engine life. With a practical RPM range of 4,000 to 42,000, this engine offers smooth and linear power delivery for superior performance in off-road racing environments.

Features:

• Redesigned cylinder and liner with three ports for improved torque
• Black and silver anodized cooling head for efficient heat dissipation
• DLC-coated crankshaft with revised internal shape for better power delivery
• Double-seal front bearing for increased durability and idle stability
• Ceramic bearing in the crankcase for reliable performance
• Specially treated thrust plate reduces friction wear for longer engine life

Specifications:

• Displacement: 3.49 cc / 0.213 cu.in.
• Bore: 0.641 in. (16.27mm)
• Stroke: 0.661in. (16.80mm)
• Output Power: 2.68 ps / 2.64 hp / 34,000 r.p.m.
• Practical RPM Range: 4,000-42,000 r.p.m.
• Engine Weight: 12.28 oz. (348g)
• Recommended Application: 1/8 Buggy Off-Road

Includes:

• (1) B2105 Competition .21 Nitro Engine w/Pipe Combo

CA Residents Prop 65 Warning WARNING: This product can expose you to chemicals including Di(2-ethylhexyl)phthalate (DEHP), which is known to the State of California to cause cancer and birth defects or other reproductive harm. For more information go to www.P65Warnings.ca.gov Details…

This product is expected to become available for purchase on Saturday, October 10, 2026