At the heart of the 2024 Sym Jet 4 RX 125 scooter motorcycle, Sym utilizes a 124.6 cc (7.6 cu in) air-cooled single cylinder, four-stroke layout. In factory specification, peak output is rated at 11.3 HP (8.2 kW) at 8,500 rpm while maximum torque reaches 10.3 Nm (7.6 lb-ft) at 6,500 rpm, transferring power to the rear wheel through a automatic gearbox and belt final drive. With a specific output of 90.7 HP per liter and a 2,000 rpm working window between peak torque (6,500 rpm) and peak power (8,500 rpm), the engine character is indicating a tractable, stress-free state of tune focused on everyday usability and broad torque delivery.
On the scales, the Jet 4 RX 125 measures 115 kg (254 lbs) wet (curb), 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 760 mm (29.9 in) seat height — giving shorter riders and urban commuters confident flat-foot reach at traffic stops, combined with a 1,320 mm (52 in) wheelbase engineered for quick, flickable steering geometry. The 6.2-liter (1.6 US gal) fuel tank supports practical everyday commuting and weekend road stints, while factory top speed is listed at 99 km/h (62 mph).
Within MotoLibrary's Sym archive, this model family spans 2 indexed model years from 2022 to 2024, allowing buyers to track year-over-year changes in emissions tuning, weight and equipment.
Specific Output
90.7 HP/L
Power-to-Weight
0.1 HP/kg (10.18 kg/HP)
Power Band Window
6,500–8,500 rpm
Standover Height
760 mm (29.9 in)
Engine
Displacement124.6 ccm (7.60 cubic inches)
Engine TypeSingle cylinder, four-stroke
Power11.3 HP (8.2 kW)) @ 8500 RPM
Torque10.3 Nm (1.1 kgf-m or 7.6 ft.lbs) @ 6500 RPM
Fuel SystemInjection
CoolingAir
Transmission
GearboxAutomatic
Final DriveBelt (final drive)
DrivelineCVT
Performance
Top Speed99.0 km/h (61.5 mph)
Emission DetailsEuro 5
Chassis
Front SuspensionTelescopic Fork
Rear SuspensionSingle Shock
Wheelbase1320 mm (52.0 inches)
Wheels & Brakes
Front Tyre110/70-12
Rear Tyre120/70-12
Front BrakesSingle disc. Combined braking system (CBS)
Front Brake Ø226 mm (8.9 inches)
Rear BrakesExpanding brake (drum brake)
Rear Brake Ø130 mm (5.1 inches)
WheelsCast aluminium
Dimensions & Weight
Weight incl.115.0 kg (253.5 pounds)
Seat Height760 mm (29.9 inches) If adjustable, lowest setting.
Overall Height1110 mm (43.7 inches)
Overall Length1900 mm (74.8 inches)
Overall Width745 mm (29.3 inches)
Fuel Capacity6.20 litres (1.64 US gallons)
Other
StarterElectric
Color OptionsRed, blue, black, grey
InstrumentsLCD dashboard
LightLED lights
Notes
SYM scooters are produced by Sanyang Motor in Taiwan.
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.
Seat Height
Check the seat height against your inseam and riding posture before choosing a motorcycle.
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.
