User Rating: /5 · No user ratings yet✓ Your rating was saved
MotoLibrary Score
37/100Commuter
Power/Weight
0.1 hp/kg
Top Speed
100 km/h
Engine
123 ccm
Technical Overview
1974 CZ 125 Sport Technical Analysis & Specification Breakdown
At the heart of the 1974 CZ 125 Sport touring motorcycle, CZ utilizes a 123.2 cc (7.5 cu in) air-cooled single cylinder, two-stroke layout. In factory specification, peak output is rated at 11 HP (8 kW), transferring power to the rear wheel through a 4-speed gearbox and chain final drive. With a specific output of 89.3 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 125 Sport measures 112 kg (247 lbs) dry, translating to a power-to-weight ratio of 0.1 HP/kg (10.18 kg per horsepower). Rider ergonomics and chassis geometry center around a 1,950 mm (76.8 in) wheelbase engineered for planted straight-line stability. The 11.5-liter (3 US gal) fuel tank supports practical everyday commuting and weekend road stints, while factory top speed is listed at 100 km/h (62 mph).
Specific Output
89.3 HP/L
Power-to-Weight
0.1 HP/kg (10.18 kg/HP)
Engine
Displacement123.2 ccm (7.52 cubic inches)
Engine TypeSingle cylinder, two-stroke
Engine DetailsSingle cylinder, two-stroke
Power11.0 HP (8.0 kW))
Compression8.8:1
Bore x Stroke52.0 x 58.0 mm (2.0 x 2.3 inches)
Valves/Cylinder0
Fuel SystemCarburettor. Jikov 24mm
Fuel ControlPiston port
LubricationFuel mix
CoolingAir
Max RPM5750
Transmission
Gearbox4-speed
Final DriveChain (final drive)
ClutchWet plate
DrivelineChain final drive
Chain Size520
Performance
Top Speed99.8 km/h (62.0 mph)
ExhaustSingle pipe
Chassis
Frame TypeTubular
Front SuspensionForks
Front Travel130 mm (5.1 inches)
Rear SuspensionTwin shocks
Rear Travel100 mm (3.9 inches)
Wheelbase1950 mm (76.8 inches)
Ground Clearance84 mm (3.3 inches)
Wheels & Brakes
Front Tyre3.00-18
Rear Tyre3.00-18
Front BrakesExpanding brake (drum brake)
Front Brake Ø160 mm (6.3 inches)
Rear BrakesExpanding brake (drum brake)
Rear Brake Ø160 mm (6.3 inches)
Dimensions & Weight
Dry Weight112.0 kg (246.9 pounds)
Power/Weight0.0982 HP/kg
Overall Height1005 mm (39.6 inches)
Overall Length1295 mm (51.0 inches)
Overall Width650 mm (25.6 inches)
Fuel Capacity11.50 litres (3.04 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.
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.
