Built around Yuki's allround motorcycle platform, the 2018 Yuki 125 Manxman pairs a 125 cc (7.6 cu in) single cylinder, four-stroke architecture with road-focused gearing. In factory specification, peak output is rated at 11.4 HP (8.3 kW) at 8,500 rpm while maximum torque reaches 9.5 Nm (7 lb-ft) at 8,000 rpm, transferring power to the rear wheel through a 5-speed gearbox and chain final drive. With a specific output of 91.2 HP per liter and a 500 rpm working window between peak torque (8,000 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 125 Manxman measures 115 kg (254 lbs) dry, translating to a power-to-weight ratio of 0.1 HP/kg (10.09 kg per horsepower). Rider ergonomics and chassis geometry center around a 720 mm (28.3 in) seat height — giving shorter riders and urban commuters confident flat-foot reach at traffic stops, combined with a 1,240 mm (48.8 in) wheelbase engineered for quick, flickable steering geometry. The 9-liter (2.4 US gal) fuel tank supports practical everyday commuting and weekend road stints, while factory top speed is listed at 90 km/h (56 mph).
Within MotoLibrary's Yuki archive, this model family spans 2 indexed model years from 2015 to 2018, allowing buyers to track year-over-year changes in emissions tuning, weight and equipment.
Specific Output
91.2 HP/L
Power-to-Weight
0.1 HP/kg (10.09 kg/HP)
Power Band Window
8,000–8,500 rpm
Standover Height
720 mm (28.3 in)
Engine
Displacement125.0 ccm (7.63 cubic inches)
Engine TypeSingle cylinder, four-stroke
Power11.4 HP (8.3 kW)) @ 8500 RPM
Torque9.5 Nm (1.0 kgf-m or 7.0 ft.lbs) @ 8000 RPM
Fuel SystemCarburettor
Fuel ControlOverhead Cams (OHC)
IgnitionCDI
Transmission
Gearbox5-speed
Final DriveChain (final drive)
Performance
Top Speed90.0 km/h (55.9 mph)
Chassis
Front SuspensionTelescopic fork
Rear SuspensionTwin shock absorbers
Wheelbase1240 mm (48.8 inches)
Wheels & Brakes
Front Tyre90/90-18
Rear Tyre120/80-16
Front BrakesSingle disc
Rear BrakesExpanding brake (drum brake)
Dimensions & Weight
Dry Weight115.0 kg (253.5 pounds)
Power/Weight0.0991 HP/kg
Seat Height720 mm (28.3 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.
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.
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.
