Sport · 1981

RD 250 (reduced effect)

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MotoLibrary Score

43 /100 Commuter

Power

27 HP

Top Speed

149 km/h

Engine

247 ccm

Technical Overview

1981 Yamaha RD 250 (reduced effect) Technical Analysis & Specification Breakdown

At the heart of the 1981 Yamaha RD 250 (reduced effect) sport motorcycle, Yamaha features a 247 cc (15.1 cu in) liquid-cooled twin, two-stroke configuration. In factory specification, peak output is rated at 27 HP (19.7 kW) at 8,100 rpm, transferring power to the rear wheel through a 6-speed gearbox and chain final drive. With a specific output of 109.3 HP per liter, the engine character is reflecting a performance-oriented street tune that balances strong mid-range pull with an energetic top-end rush.

On the scales, the RD 250 (reduced effect) measures 158 kg (348 lbs) wet (curb), translating to a power-to-weight ratio of 0.17 HP/kg (5.85 kg per horsepower). The 17-liter (4.5 US gal) fuel tank supports practical everyday commuting and weekend road stints, while factory top speed is listed at 149 km/h (93 mph).

Specific Output

109.3 HP/L

Power-to-Weight

0.17 HP/kg (5.85 kg/HP)

Engine

Displacement 247.0 ccm (15.07 cubic inches)

Engine Type Twin, two-stroke

Engine Details Twin, two-stroke

Power 27.0 HP (19.7 kW)) @ 8100 RPM

Compression 6.2:1

Bore x Stroke 54.0 x 54.0 mm (2.1 x 2.1 inches)

Fuel Control Membrane

Cooling Liquid

Transmission

Gearbox 6-speed

Final Drive Chain (final drive)

Performance

Top Speed 149.0 km/h (92.6 mph)

Wheels & Brakes

Front Tyre 3.00-18

Rear Tyre 3.50-18

Front Brakes Single disc

Rear Brakes Expanding brake

Dimensions & Weight

Weight incl. 158.0 kg (348.3 pounds)

Fuel Capacity 17.00 litres (4.49 US gallons)

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Power

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Fuel Capacity

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Brakes

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Transmission

Transmission and final drive affect maintenance, smoothness and everyday usability.

Rider Profile

Who Is This Bike For?

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Beginner

A2 license compatible, manageable power.

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Best For

Sport & Track

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