2025 Sym Joymax Z Plus 300 Technical Analysis & Specification Breakdown
Engineered by Sym for the scooter motorcycle segment, the 2025 Sym Joymax Z Plus 300 relies on a 278.3 cc (17 cu in) liquid-cooled single cylinder, four-stroke powerplant. In factory specification, peak output is rated at 25.6 HP (18.7 kW) at 7,500 rpm while maximum torque reaches 26.2 Nm (19.3 lb-ft) at 6,750 rpm, transferring power to the rear wheel through a automatic gearbox and belt final drive. With a specific output of 92 HP per liter and a 750 rpm working window between peak torque (6,750 rpm) and peak power (7,500 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 Joymax Z Plus 300 measures 185 kg (408 lbs) wet (curb), translating to a power-to-weight ratio of 0.14 HP/kg (7.23 kg per horsepower). Rider ergonomics and chassis geometry center around a 747 mm (29.4 in) seat height — giving shorter riders and urban commuters confident flat-foot reach at traffic stops, combined with a 1,550 mm (61 in) wheelbase engineered for planted straight-line stability. The 12-liter (3.2 US gal) fuel tank supports practical everyday commuting and weekend road stints, while factory top speed is listed at 122 km/h (76 mph).
Within MotoLibrary's Sym archive, this model family spans 3 indexed model years from 2023 to 2025, allowing buyers to track year-over-year changes in emissions tuning, weight and equipment.
Specific Output
92 HP/L
Power-to-Weight
0.14 HP/kg (7.23 kg/HP)
Power Band Window
6,750–7,500 rpm
Standover Height
747 mm (29.4 in)
Engine
Displacement278.3 ccm (16.98 cubic inches)
Engine TypeSingle cylinder, four-stroke
Power25.6 HP (18.7 kW)) @ 7500 RPM
Torque26.2 Nm (2.7 kgf-m or 19.3 ft.lbs) @ 6750 RPM
Bore x Stroke75.0 x 63.0 mm (3.0 x 2.5 inches)
Fuel SystemInjection
Fuel ControlOverhead Cams (OHC)
CoolingLiquid
Transmission
GearboxAutomatic
Final DriveBelt (final drive)
DrivelineCVT
Performance
Top Speed122.0 km/h (75.8 mph)
Emission DetailsEuro 5
Chassis
Front SuspensionTelescope fork
Rear SuspensionDual Shock
Wheelbase1550 mm (61.0 inches)
Wheels & Brakes
Front Tyre120/70-14
Rear Tyre140/60-13
Front BrakesSingle disc. ABS.
Front Brake Ø260 mm (10.2 inches)
Rear BrakesSingle disc. ABS.
Rear Brake Ø240 mm (9.4 inches)
Dimensions & Weight
Weight incl.185.0 kg (407.9 pounds)
Seat Height747 mm (29.4 inches) If adjustable, lowest setting.
Overall Height1440 mm (56.7 inches)
Overall Length2190 mm (86.2 inches)
Overall Width750 mm (29.5 inches)
Fuel Capacity12.00 litres (3.17 US gallons)
Other
StarterElectric
Color OptionsGrey, blue, black
InstrumentsColor LCD instrument panel
LightLED lights
Carrying CapacityUnderseat storage
Notes
The SYM brand is owned 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.
