At the heart of the 2006 Yamaha RZ 50 sport motorcycle, Yamaha relies on a 49 cc (3 cu in) liquid-cooled single cylinder, two-stroke powerplant. In factory specification, peak output is rated at 7.1 HP (5.2 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 37.0 mm (1.6 x 1.5 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 (11.27 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 (11.27 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
Power7.1 HP (5.2 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 37.0 mm (1.6 x 1.5 inches)
Valves/Cylinder0
Fuel SystemCarburettor
Fuel ControlReed valve / power valve
IgnitionC.D.I. Formula
LubricationSeparate lubrication with automatic oil pump
CoolingLiquid
Transmission
Gearbox6-speed
Final DriveChain (final drive)
ClutchWet multiple plate coil springs
DrivelineChain final drive
Chain Size420
Chassis
Front SuspensionHydraulic telescopic fork
Rear SuspensionSwingarm with twin shocks
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 BrakesSingle disc
Dimensions & Weight
Dry Weight80.0 kg (176.4 pounds)
Power/Weight0.0888 HP/kg
Seat Height745 mm (29.3 inches) If adjustable, lowest setting.
Fuel Capacity10.00 litres (2.64 US gallons)
Oil Capacity1.30 litres 2T reservoir / 0.80 L gearbox
Service & Fluids
Engine Oil2-stroke synthetic motorcycle oil (API TC / JASO FC/FD)
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.
Suspension
Suspension details can matter for comfort, road feel and long-distance riding.
Transmission
Transmission and final drive affect maintenance, smoothness and everyday usability.
