The Kawasaki GPZ305 is a sport touring motorcycle produced by Kawasaki Heavy Industries from 1983 to 1994. It was part of Kawasaki's popular GPZ series, which featured a range of sport-oriented motorcycles with varying engine displacements. The GPZ305 was marketed as an accessible, lightweight, and reliable option, bridging the gap between smaller commuter bikes and larger, more powerful sportbikes.
History and Development
Introduced in 1983, the GPZ305 was developed during a period where manufacturers were offering a wider range of displacement options for riders seeking different levels of performance and experience. It shared styling cues with its larger GPZ siblings, such as the GPZ550 and GPZ750, giving it a sporty appearance. A notable variant, the GPZ305 Belt Drive, featured a quiet and low-maintenance belt final drive system, distinguishing it from most chain-driven motorcycles of the era. This model was particularly aimed at the commuter market and new riders due to its user-friendly nature. Production continued for over a decade, indicating its popularity and practicality.
Technical Specifications
The Kawasaki GPZ305 was characterized by its practical yet spirited performance for its class.
- Engine:
- Type: Liquid-cooled, 4-stroke, parallel-twin
- Valve Train: DOHC, 2 valves per cylinder
- Displacement: 305 cc
- Bore x Stroke: 61.0 x 52.0 mm
- Compression Ratio: Approximately 9.5:1
- Fuel System: Dual Keihin carburetors
- Ignition: Electronic
- Starting System: Electric starter
- Power and Performance:
- Maximum Power: Around 27-30 bhp (20-22 kW) at 9,500 rpm (varied slightly by market)
- Maximum Torque: Approximately 17-18 lb-ft (23-24 Nm) at 8,000 rpm
- Top Speed: Approximately 95-100 mph (150-160 km/h)
- Drivetrain:
- Transmission: 6-speed constant mesh
- Clutch: Wet, multi-plate
- Final Drive: Chain (standard models) or Belt (GPZ305 Belt Drive variant)
- Chassis:
- Frame: Double-cradle steel tube
- Front Suspension: 35mm conventional telescopic fork
- Rear Suspension: Uni-Trak single shock absorber with adjustable preload
- Front Brake: Single disc with 2-piston caliper
- Rear Brake: Drum (early models) or Single disc (later models and some variants)
- Front Tire: 100/90-16
- Rear Tire: 120/90-16
- Dimensions and Weight:
- Wheelbase: Approximately 1,385 mm (54.5 in)
- Seat Height: Approximately 775 mm (30.5 in)
- Curb Weight: Approximately 150-160 kg (330-350 lbs)
Features and Characteristics
The GPZ305 was designed with an emphasis on user-friendliness and reliability. Its liquid-cooled twin-cylinder engine provided smooth power delivery and good fuel efficiency for its class. The Uni-Trak rear suspension system, a Kawasaki hallmark, offered progressive damping. The option of a belt drive on certain models was a significant feature, reducing maintenance requirements compared to traditional chain drives and contributing to a quieter ride. Its relatively low seat height and light weight made it a popular choice for new riders, women riders, and commuters.
Legacy
The Kawasaki GPZ305, despite its smaller displacement, played an important role in Kawasaki's lineup by offering an accessible entry point into sportbike ownership. It demonstrated Kawasaki's commitment to providing a range of motorcycles for diverse rider needs. Its design and mechanical principles influenced subsequent Kawasaki models in the entry-level sportbike segment, eventually leading to models like the Kawasaki EX500/GPZ500S (Ninja 500R in North America), which built upon the parallel-twin engine architecture. Today, the GPZ305 is remembered as a durable and practical classic, often appreciated by enthusiasts for its simplicity and reliability.