Positioned in WSK's touring motorcycle lineup, the 1977 WSK M21W2B Kobuz pairs a 174 cc (10.6 cu in) air-cooled single cylinder, two-stroke architecture with road-focused gearing. In factory specification, peak output is rated at 14 HP (10.2 kW) at 6,000 rpm while maximum torque reaches 16 Nm (11.8 lb-ft), transferring power to the rear wheel through a 4-speed gearbox and chain final drive. With a specific output of 80.5 HP per liter, the engine character is indicating a tractable, stress-free state of tune focused on everyday usability and broad torque delivery.
On the scales, the M21W2B Kobuz measures 112 kg (247 lbs) dry, translating to a power-to-weight ratio of 0.13 HP/kg (8 kg per horsepower). Rider ergonomics and chassis geometry center around a 1,320 mm (52 in) wheelbase engineered for quick, flickable steering geometry. The 10-liter (2.6 US gal) fuel tank paired with a rated consumption of 3 L/100 km provides an estimated theoretical range of roughly 333 km (207 miles) between fill-ups.
Specific Output
80.5 HP/L
Power-to-Weight
0.13 HP/kg (8 kg/HP)
Theoretical Range
~333 km (207 mi)
Engine
Displacement174.0 ccm (10.62 cubic inches)
Engine TypeSingle cylinder, two-stroke
Engine DetailsSingle cylinder, two-stroke
Power14.0 HP (10.2 kW)) @ 6000 RPM
Torque16.0 Nm (1.6 kgf-m or 11.8 ft.lbs)
Compression9.0:1
Bore x Stroke61.0 x 59.0 mm (2.4 x 2.3 inches)
Fuel SystemCarburettor. GM26U Pegaz
IgnitionBattery
LubricationMixture 1:30
CoolingAir
Transmission
Gearbox4-speed
Final DriveChain (final drive)
ClutchWet 4-plate
Performance
Fuel Consumption3.00 litres/100 km (33.3 km/l or 78.41 mpg)
Greenhouse Gases69.6 CO2 g/km. (CO2 - Carbon dioxide emission)
ExhaustSingle stainless steel pipes
Chassis
Frame TypeSingle, steel welded tubes
Front SuspensionCoil springs with oil shock absorbers in fork
Front Travel150 mm (5.9 inches)
Rear SuspensionTrailing arms with two coil springs and oil shock absorbers
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.
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.
