Honda CB250N

Honda CB250N

The Honda CB250N represents a harmonious blend of sporty performance and everyday practicality in the late-1970s 250-cc motorcycle class. With its twin-cylinder engine, disc front brake, and upright riding position, it bridged the gap between commuter machines and true roadsters. Riders prized its smooth power delivery, agile handling, and Honda’s hallmark reliability. Decades on, the CB250N remains a sought-after classic for both collectors and modern riders seeking a lightweight, characterful machine.

Historical Background

Genesis of the CB250N

In 1978, Honda expanded its popular CB250 lineup with the CB250N model—often called the Super Dream in European markets. Building on the success of the earlier CB250T, Honda engineers introduced a revised cylinder head and cam profile for improved midrange torque. A larger front disc brake and updated styling cues elevated the CB250N above its predecessors.

Market Impact and Evolution

The CB250N enjoyed strong sales through the early 1980s, appealing to new riders and experienced commuters alike. Its combination of manageable performance and low upkeep costs undercut larger-displacement rivals. Minor updates—such as revised side-panel graphics and seat trims—kept it fresh until production wound down in 1983. Today, its enduring parts availability and straightforward mechanics make it a favorite among restorers.

Design and Ergonomics

Styling Details

The CB250N’s aesthetic is defined by clean lines and restrained chrome accents. A sculpted tank flows into a stepped dual-seat, while polished exhaust headers wrap neatly around each cylinder. Side covers feature subtle pinstriping and model badging. A round headlamp framed by thin chrome trim rings and a simple rectangular tail lamp preserve the era’s minimalist roadster appeal.

Rider Positioning

An upright handlebar sits just above the top yoke, promoting a relaxed posture for both city traffic and country cruising. Footpegs are centrally located—neither too cramped nor excessively forward—to balance control with comfort. At 780 mm, the seat height accommodates a wide spectrum of rider statures, and the narrow tank waist allows easy ground reach.

Engine and Powertrain

Parallel-Twin Configuration

Power comes from a 249 cc air-cooled, single-overhead-cam, parallel-twin engine. Its 53 × 54 mm bore and stroke deliver a broad, tractable torque curve. Lightweight aluminum pistons and a short, direct cam drive ensure crisp throttle response—ideal for navigating urban streets.

Output Figures

The CB250N produces approximately 22 hp at 9,000 rpm and 19 Nm of torque at 7,500 rpm. While modest on paper, the smooth, rev-happy engine rewards riders with linear acceleration and usable power from 4,000 rpm onward.

Fuel Delivery and Ignition

Dual 24 mm Keihin constant-velocity carburetors feed each cylinder, featuring vacuum-slide operation for stable idling and instant throttle response. An electronic CDI ignition system provides consistent spark timing and reduces the need for frequent maintenance.

Transmission and Final Drive

A five-speed constant-mesh gearbox offers well-spaced ratios for quick launches and relaxed highway cruising. Power transfers to the rear wheel via an O-ring–sealed chain, combining efficiency with extended service intervals.

Chassis and Suspension

Frame Construction

The CB250N’s backbone is a tubular steel twin-cradle frame that uses the engine as a stressed member. This design balances rigidity for precise handling with controlled flex to absorb road irregularities.

Front Suspension

Conventional 35 mm telescopic forks provide 130 mm of travel. Springs and damping are tuned to soak up urban bumps without sacrificing corner-entry feedback.

Rear Suspension

Dual coil-spring shock absorbers offer five-position preload adjustment and 115 mm of travel. Riders can dial in firmness for solo rides or soften the rear end when carrying a pillion or luggage.

Brakes and Wheels

Front Brake

A 275 mm hydraulic disc brake with a two-piston caliper delivers strong, fade-resistant stopping power. Braided hoses improve lever feel and reduce expansion under heavy use.

Rear Brake

A 110 mm leading-trailing drum brake provides predictable rear-wheel control. Shoe replacement and adjustment require minimal disassembly, keeping maintenance simple.

Wheels and Tires

Cast aluminum rims measure 18 inches front and rear. Standard tires of 2.75-18 up front and 3.00-18 at the rear strike a balance between grip and rolling comfort, while their slim profiles support crisp steering responses.

Electrical and Instrumentation

A 12 V, 9 Ah battery pairs with a stator output of roughly 130 W at 5,000 rpm. The lighting setup includes a halogen headlamp, incandescent turn signals, and an LED-style tail lamp in later production. The instrument cluster features twin analog gauges for speedometer and tachometer, flanked by warning lights for neutral, high beam, turn signals, and oil pressure.

Performance and Handling

Urban Agility

At a curb weight of approximately 135 kg, the CB250N feels exceptionally light in traffic. Its narrow profile and low seat height make lane splitting and tight U-turns effortless. The engine’s midrange pull accelerates quickly from stoplights without laboring the drivetrain.

Highway Capability

While not built for high-speed runs, the CB250N can maintain a steady 110 km/h on open roads. Above 8,000 rpm, vibration increases modestly, but the chassis remains composed. Fuel economy of around 4 L/100 km provides a practical range of 300 km on the 13 L tank.

Maintenance and Service

Routine servicing on the CB250N is straightforward:

• Oil and filter change every 5,000 km
• Valve clearance check every 10,000 km
• Carburetor synchronization and cleaning every 12,000 km
• Chain lubrication and tension adjustment every 1,000 km
• Brake fluid replacement every 24 months

Spare parts remain widely available through Honda’s vintage-parts network, keeping long-term ownership costs in check.

Technical Specifications

Conclusion

The Honda CB250N remains a testament to thoughtful motorcycle design in the 250-cc class. Its blend of smooth twin-cylinder performance, agile chassis dynamics, and low maintenance demands earned it a devoted following both in its heyday and today. Whether as a daily commuter, weekend tourer, or classic restoration project, the CB250N continues to deliver an engaging riding experience with enduring charm.