At the heart of the 1987 SVM S 3 125 GS motorcycle, SVM features a 124 cc (7.6 cu in) air-cooled single cylinder, two-stroke configuration. In factory specification, peak output is rated at 19.5 HP (14.2 kW) at 6,800 rpm, transferring power to the rear wheel through a 6-speed gearbox and chain final drive. With a specific output of 157.3 HP per liter, the engine character is placing it firmly in high-revving supersport territory where top-end breathing dominates.
On the scales, the S 3 125 GS measures 82 kg (181 lbs) wet (curb), translating to a power-to-weight ratio of 0.24 HP/kg (4.21 kg per horsepower). The 5-liter (1.3 US gal) fuel tank supports practical everyday commuting and weekend road stints, while factory top speed is listed at 100 km/h (62 mph).
Within MotoLibrary's SVM archive, this model family spans 2 indexed model years from 1986 to 1987, allowing buyers to track year-over-year changes in emissions tuning, weight and equipment.
Specific Output
157.3 HP/L
Power-to-Weight
0.24 HP/kg (4.21 kg/HP)
Engine
Displacement124.0 ccm (7.57 cubic inches)
Engine TypeSingle cylinder, two-stroke
Engine DetailsSingle cylinder, two-stroke
Power19.5 HP (14.2 kW)) @ 6800 RPM
Compression8.5:1
Bore x Stroke54.0 x 54.0 mm (2.1 x 2.1 inches)
Valves/Cylinder0
Fuel ControlMembrane
IgnitionCDI
LubricationSeparate lubrication with automatic oil pump
CoolingAir
Transmission
Gearbox6-speed
Final DriveChain (final drive)
ClutchMultiplate wet clutch in oil bath
DrivelineChain final drive
Chain Size520
Performance
Top Speed100.0 km/h (62.1 mph)
Wheels & Brakes
Front Tyre2.75-21
Rear Tyre4.00-18
Front BrakesSingle disc
Rear BrakesExpanding brake
Dimensions & Weight
Weight incl.82.0 kg (180.8 pounds)
Fuel Capacity5.00 litres (1.32 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.
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.
