The Honda CB900C, also referred to as the Custom, is a large-displacement motorcycle produced primarily in the early 1980s. Positioned as a cruiser-style variant of Honda’s CB series, it combines the performance of a standard motorcycle with styling cues and ergonomics suited for relaxed touring. With its distinctive long-wheelbase design, shaft drive, and reliable inline-four engine, the CB900C offers a balance between comfort, performance, and low maintenance.
Engine and Performance
The CB900C is powered by a robust air-cooled, four-stroke, inline-four engine, derived from Honda’s CB series but tuned for smooth torque delivery rather than peak horsepower. Its engineering focuses on durability and predictable power for cruising and long-distance riding.
Key engine specifications:
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Displacement: 901 cc
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Configuration: Inline four-cylinder, air-cooled, DOHC
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Bore x Stroke: 64.5 mm x 69 mm
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Compression Ratio: 9.0:1
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Valve Train: 16 valves, dual overhead camshaft
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Carburetion: Four constant-velocity carburetors
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Ignition: Electronic CDI (Capacitor Discharge Ignition)
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Power Output: Approximately 95 horsepower at 8,000 rpm
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Torque: Approximately 58 lb-ft at 6,000 rpm
The engine delivers smooth mid-range torque suitable for urban riding and highway cruising. The DOHC design enables higher rev capability while maintaining reliability.
Transmission and Drivetrain
The CB900C uses a five-speed manual transmission, providing a comfortable balance between acceleration and relaxed highway cruising.
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Clutch: Multi-plate wet type
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Final Drive: Shaft drive, enclosed to minimize maintenance
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Gear Ratios: Optimized for smooth city and highway performance
The shaft drive system reduces routine maintenance needs compared to chain-driven motorcycles and contributes to the bike’s reputation for reliability.
Chassis and Frame
Honda engineered the CB900C with a long-wheelbase frame for enhanced stability and rider comfort. The steel double-cradle frame provides durability while accommodating the heavier cruiser bodywork and passenger comfort.
Chassis specifications:
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Frame Type: Steel double-cradle
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Wheelbase: 1,530 mm
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Rake/Trail: 29 degrees / 114 mm
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Dry Weight: Approximately 245 kg
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Seat Height: 780 mm
The frame geometry favors stability at highway speeds while maintaining manageable handling in urban conditions.
Suspension System
The suspension is tuned for comfort, absorbing bumps and providing a smooth ride for both rider and passenger.
Front Suspension:
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Type: Telescopic fork
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Travel: Approximately 130 mm
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Adjustability: Non-adjustable
Rear Suspension:
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Type: Dual shock absorbers with adjustable preload
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Travel: Approximately 110 mm
The setup balances ride comfort with controlled handling, suitable for both city streets and open highways.
Braking System
The CB900C employs reliable braking systems appropriate for its weight and performance.
Front Brakes:
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Dual hydraulic disc brakes
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Disc Diameter: 296 mm
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Calipers: Two-piston
Rear Brake:
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Drum brake
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Diameter: 180 mm
This configuration provides adequate stopping power for both solo and two-up riding, with predictable brake feel.
Wheels and Tires
The wheels are designed to offer stability and traction for a cruiser-style motorcycle.
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Front Wheel: 19-inch cast alloy or spoked depending on market
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Rear Wheel: 16-inch cast alloy or spoked
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Front Tire: 100/90-19
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Rear Tire: 130/90-16
The larger front wheel contributes to straight-line stability, while the rear tire provides a balanced contact patch for cruising and occasional spirited riding.
Fuel System and Efficiency
The CB900C prioritizes reliable fuel delivery and moderate efficiency suitable for long-distance touring.
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Fuel Capacity: Approximately 17 liters (4.5 gallons)
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Fuel System: Four CV carburetors
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Fuel Economy: 35–40 mpg depending on riding style and conditions
The carburetors are tuned for smooth throttle response, and the fuel tank capacity ensures extended riding range without frequent stops.
Bodywork and Styling
The CB900C features cruiser-oriented styling with a stepped seat, swept-back handlebars, and extended fenders. Its design emphasizes comfort and long-distance capability while retaining classic Honda CB series aesthetics.
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Materials: Steel and molded plastics for body panels and fenders
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Seat: Wide, stepped with passenger accommodation
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Handlebars: Raised and swept-back for relaxed ergonomics
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Instrumentation: Analog speedometer, tachometer, fuel gauge, and indicator lights
The bodywork provides wind protection and rider comfort while enhancing the motorcycle’s cruiser identity.
Electrical System
The electrical system supports all essential functions with reliability.
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Battery: 12V maintenance-free
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Lighting: Halogen headlight, turn signals, and tail/brake lights
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Ignition: Electronic CDI for precise timing and dependable starts
The system is designed to minimize electrical failures and facilitate easy maintenance.
Comfort and Ergonomics
Ergonomics are a key feature of the CB900C, with an upright seating position, wide seat, and spacious footpeg placement. These features make it suitable for extended rides, city commuting, and touring with a passenger.
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Rider Position: Upright with relaxed knee bend
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Passenger Comfort: Spacious seat and grab handles
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Wind Protection: Extended fenders and optional aftermarket windscreen
Maintenance and Reliability
The CB900C is known for low maintenance and exceptional reliability. The air-cooled engine, shaft drive, and simple suspension reduce service intervals, making it a practical choice for riders who prioritize durability. Valve adjustments are infrequent, and the engine design supports long-term operation with minimal intervention.
Model Variations and Evolution
Produced primarily between 1981 and 1983, the CB900C shared many components with the standard CB900F but featured cruiser styling and shaft drive. Minor variations included cosmetic differences and minor mechanical improvements depending on the year and market.
Legacy and Influence
The Honda CB900C remains a notable model in Honda’s cruiser history. Its combination of shaft drive, inline-four performance, and cruiser ergonomics influenced later Honda cruisers and touring motorcycles. Enthusiasts appreciate it for its low-maintenance operation, solid reliability, and classic styling.
Conclusion
The Honda CB900C is a versatile and durable cruiser that blends the performance of an inline-four engine with the comfort and practicality of a touring motorcycle. Its long-wheelbase chassis, shaft drive, smooth engine, and ergonomic design make it a unique offering in Honda’s lineup, offering a balance of performance, reliability, and rider comfort. The CB900C remains a respected model for riders who value practicality without sacrificing classic motorcycle performance.
