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MotoLibrary Score
35/100Commuter
Power
8 HP
Top Speed
90 km/h
Engine
123 ccm
Technical Overview
1977 MM VZ 3 Technical Analysis & Specification Breakdown
At the heart of the 1977 MM VZ 3 motorcycle, MM features a 123 cc (7.5 cu in) air-cooled single cylinder, two-stroke configuration. In factory specification, peak output is rated at 8 HP (5.8 kW) at 5,900 rpm, transferring power to the rear wheel through a 4-speed gearbox and chain final drive. With a specific output of 65 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 VZ 3 measures 108 kg (238 lbs) wet (curb), translating to a power-to-weight ratio of 0.07 HP/kg (13.5 kg per horsepower). The 11-liter (2.9 US gal) fuel tank supports practical everyday commuting and weekend road stints, while factory top speed is listed at 90 km/h (56 mph).
Specific Output
65 HP/L
Power-to-Weight
0.07 HP/kg (13.5 kg/HP)
Engine
Displacement123.0 ccm (7.51 cubic inches)
Engine TypeSingle cylinder, two-stroke
Engine DetailsSingle cylinder, two-stroke
Power8.0 HP (5.8 kW)) @ 5900 RPM
Compression9.0:1
Bore x Stroke52.0 x 58.0 mm (2.0 x 2.3 inches)
Valves/Cylinder0
Fuel ControlPort control
LubricationSeparate lubrication with automatic oil pump
CoolingAir
Transmission
Gearbox4-speed
Final DriveChain (final drive)
ClutchMultiplate wet clutch in oil bath
DrivelineChain final drive
Chain Size520
Performance
Top Speed90.0 km/h (55.9 mph)
Wheels & Brakes
Front Tyre3.00-18
Rear Tyre3.00-18
Front BrakesExpanding brake
Rear BrakesExpanding brake
Dimensions & Weight
Weight incl.108.0 kg (238.1 pounds)
Fuel Capacity11.00 litres (2.91 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)
Spark PlugsNGK BR9EG / BR10EG
Battery12V 4Ah (YTX4L-BS)
Other
StarterKick
Electrical12V 4Ah (YTX4L-BS)
Buying Checklist
Before You Compare This Bike
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.
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.
