Engineered by Suzuki for the naked motorcycle segment, the 1989 Suzuki GS 125 ESF pairs a 124 cc (7.6 cu in) air-cooled single cylinder, four-stroke architecture with road-focused gearing. In factory specification, peak output is rated at 13.3 HP (9.7 kW) at 8,500 rpm, transferring power to the rear wheel through a 5-speed gearbox and chain final drive. With a specific output of 107.3 HP per liter, the engine character is reflecting a performance-oriented street tune that balances strong mid-range pull with an energetic top-end rush.
On the scales, the GS 125 ESF measures 103 kg (227 lbs) dry, translating to a power-to-weight ratio of 0.13 HP/kg (7.74 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 1,270 mm (50 in) wheelbase engineered for quick, flickable steering geometry. The 11-liter (2.9 US gal) fuel tank supports practical everyday commuting and weekend road stints, while factory top speed is listed at 115 km/h (71 mph).
Specific Output
107.3 HP/L
Power-to-Weight
0.13 HP/kg (7.74 kg/HP)
Standover Height
745 mm (29.3 in)
Engine
Displacement124.0 ccm (7.57 cubic inches)
Engine TypeSingle cylinder, four-stroke
Engine DetailsSingle cylinder, four-stroke
Power13.3 HP (9.7 kW)) @ 8500 RPM
Compression9.5:1
Bore x Stroke57.0 x 48.8 mm (2.2 x 1.9 inches)
Valves/Cylinder2
Fuel SystemCarburettor. Mikuni VM24SS 24 mm
Fuel ControlOverhead Cams (OHC)
IgnitionElectronic, transistor controlled
LubricationPressure fed, wet sump
CoolingAir
Max RPM10000
Transmission
Gearbox5-speed
Final DriveChain (final drive)
ClutchWet plate
Performance
Top Speed114.7 km/h (71.3 mph)
ExhaustSignle pipe
Chassis
Wheelbase1270 mm (50.0 inches)
Ground Clearance170 mm (6.7 inches)
Wheels & Brakes
Front BrakesSingle disc
Rear BrakesExpanding brake (drum brake)
Dimensions & Weight
Dry Weight103.0 kg (227.1 pounds)
Power/Weight0.1288 HP/kg
Seat Height745 mm (29.3 inches) If adjustable, lowest setting.
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.
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.
Transmission
Transmission and final drive affect maintenance, smoothness and everyday usability.
