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Naked bike · 1991

CB-1

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MotoLibrary Score
49 /100 Balanced
Power
50 HP
Top Speed
173 km/h
Engine
399 ccm

1991 Honda CB-1 Technical Analysis & Specification Breakdown

At the heart of the 1991 Honda CB-1 naked motorcycle, Honda features a 399 cc (24.4 cu in) liquid-cooled in-line four, four-stroke configuration. In factory specification, peak output is rated at 50 HP (36.5 kW) at 10,800 rpm, transferring power to the rear wheel through a 6-speed gearbox and chain final drive. With a specific output of 125.3 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 CB-1 measures 189 kg (417 lbs) wet (curb), translating to a power-to-weight ratio of 0.26 HP/kg (3.78 kg per horsepower). The 15-liter (4 US gal) fuel tank supports practical everyday commuting and weekend road stints, while factory top speed is listed at 173 km/h (107 mph).

Specific Output
125.3 HP/L
Power-to-Weight
0.26 HP/kg (3.78 kg/HP)
Engine
Displacement 399.0 ccm (24.35 cubic inches)
Engine Type In-line four, four-stroke
Engine Details In-line four, four-stroke
Power 50.0 HP (36.5 kW)) @ 10800 RPM
Compression 11.3:1
Bore x Stroke 55.0 x 42.0 mm (2.2 x 1.7 inches)
Valves/Cylinder 4
Fuel Control Double Overhead Cams/Twin Cam (DOHC)
Cooling Liquid
Transmission
Gearbox 6-speed
Final Drive Chain (final drive)
Performance
Top Speed 173.0 km/h (107.5 mph)
Wheels & Brakes
Front Tyre 110/70-17
Rear Tyre 140/70-17
Front Brakes Single disc
Rear Brakes Single disc
Dimensions & Weight
Weight incl. 189.0 kg (416.7 pounds)
Fuel Capacity 15.00 litres (3.96 US gallons)
More from Honda
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Power
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Transmission
Transmission and final drive affect maintenance, smoothness and everyday usability.
Rider Profile

Who Is This Bike For?

🟡
Intermediate
Requires some riding experience.
🏍️
Best For
City & Weekend Rides
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