Engineered by Yamaha for the naked motorcycle segment, the 2002 Yamaha RZ 50 features a 49 cc (3 cu in) liquid-cooled single cylinder, two-stroke configuration. In factory specification, peak output is rated at 7.2 HP (5.3 kW) at 10,000 rpm while maximum torque reaches 5.9 Nm (4.4 lb-ft) at 8,000 rpm, transferring power to the rear wheel through a 6-speed gearbox and chain final drive. Internal engine geometry specifies a bore and stroke of 40.0 x 39.7 mm (1.6 x 1.6 inches) with a 7.5:1 compression ratio.
On the scales, the RZ 50 measures 80 kg (176 lbs) dry, translating to a power-to-weight ratio of 0.09 HP/kg (11.11 kg per horsepower). Rider ergonomics and chassis geometry center around a 745 mm (29.3 in) seat height — giving shorter riders and urban commuters confident flat-foot reach at traffic stops, combined with a 1,215 mm (47.8 in) wheelbase engineered for quick, flickable steering geometry. The 10-liter (2.6 US gal) fuel tank supports practical everyday commuting and weekend road stints.
Within MotoLibrary's Yamaha archive, this model family spans 2 indexed model years from 2002 to 2006, allowing buyers to track year-over-year changes in emissions tuning, weight and equipment.
Power-to-Weight
0.09 HP/kg (11.11 kg/HP)
Power Band Window
8,000–10,000 rpm
Standover Height
745 mm (29.3 in)
Engine
Displacement49.0 ccm (2.99 cubic inches)
Engine TypeSingle cylinder, two-stroke
Engine DetailsSingle cylinder, two-stroke
Power7.2 HP (5.3 kW)) @ 10000 RPM
Torque5.9 Nm (0.6 kgf-m or 4.4 ft.lbs) @ 8000 RPM
Compression7.5:1
Bore x Stroke40.0 x 39.7 mm (1.6 x 1.6 inches)
CoolingLiquid
Transmission
Gearbox6-speed
Final DriveChain (final drive)
Chassis
Wheelbase1215 mm (47.8 inches)
Ground Clearance135 mm (5.3 inches)
Wheels & Brakes
Front Tyre70/100-17 40P
Rear Tyre80/90-17 44P
Front BrakesSingle disc
Rear BrakesExpanding brake
Dimensions & Weight
Dry Weight80.0 kg (176.4 pounds)
Power/Weight0.0900 HP/kg
Seat Height745 mm (29.3 inches) If adjustable, lowest setting.
Use this page to compare this motorcycle by its real specifications, not only by model name. Focus on the details that affect fit, comfort, handling, range and ownership.
Power
Compare engine output with similar motorcycles if acceleration, highway use or two-up riding matters.
Torque
Torque is useful for judging real-world pull, especially for touring, commuting and loaded riding.
Seat Height
Check the seat height against your inseam and riding posture before choosing a motorcycle.
Weight
Compare weight carefully because it affects low-speed handling, parking and confidence.
Fuel Capacity
Fuel capacity helps estimate touring range and how often you may need to stop.
Brakes
Brake setup is worth comparing if you ride in traffic, mountains or with a passenger.
Transmission
Transmission and final drive affect maintenance, smoothness and everyday usability.
