Positioned in Yamaha's sport motorcycle lineup, the 2017 Yamaha YZF-R25 pairs a 249 cc (15.2 cu in) liquid-cooled twin, four-stroke architecture with road-focused gearing. In factory specification, peak output is rated at 30 HP (21.9 kW) at 12,000 rpm while maximum torque reaches 22.6 Nm (16.7 lb-ft) at 10,000 rpm, transferring power to the rear wheel through a 6-speed gearbox and chain final drive. With a specific output of 120.5 HP per liter and a 2,000 rpm working window between peak torque (10,000 rpm) and peak power (12,000 rpm), 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 YZF-R25 measures 166 kg (366 lbs) wet (curb), translating to a power-to-weight ratio of 0.18 HP/kg (5.53 kg per horsepower). Rider ergonomics and chassis geometry center around a 780 mm (30.7 in) seat height — offering a neutral standover height that accommodates most average-inseam riders without sacrificing cornering clearance, combined with a 1,380 mm (54.3 in) wheelbase engineered for quick, flickable steering geometry. The 14.3-liter (3.8 US gal) fuel tank supports practical everyday commuting and weekend road stints.
Within MotoLibrary's Yamaha archive, this model family spans 6 indexed model years from 2015 to 2021, allowing buyers to track year-over-year changes in emissions tuning, weight and equipment.
Specific Output
120.5 HP/L
Power-to-Weight
0.18 HP/kg (5.53 kg/HP)
Power Band Window
10,000–12,000 rpm
Standover Height
780 mm (30.7 in)
Engine
Displacement249.0 ccm (15.19 cubic inches)
Engine TypeTwin, four-stroke
Engine DetailsTwin, four-stroke
Power30.0 HP (21.9 kW)) @ 12000 RPM
Torque22.6 Nm (2.3 kgf-m or 16.7 ft.lbs) @ 10000 RPM
Compression11.2:1
Bore x Stroke60.0 x 44.1 mm (2.4 x 1.7 inches)
Valves/Cylinder4
Fuel SystemInjection. EFI
Fuel ControlDouble Overhead Cams/Twin Cam (DOHC)
IgnitionTCI
LubricationWet sump
CoolingLiquid
Transmission
Gearbox6-speed
Final DriveChain (final drive)
ClutchWet, multiple-disc coil spring
Chassis
Frame TypeDiamond
Rake25.0°
Trail95 mm (3.7 inches)
Front SuspensionTelescopic forks
Front Travel130 mm (5.1 inches)
Rear SuspensionMonocross
Rear Travel114 mm (4.5 inches)
Wheelbase1380 mm (54.3 inches)
Ground Clearance160 mm (6.3 inches)
Wheels & Brakes
Front Tyre110/70-17
Rear Tyre140/70-17
Front BrakesSingle disc. Hydraulic disc, Dual Piston Floating
Front Brake Ø298 mm (11.7 inches)
Rear BrakesSingle disc. Hydraulic disc, Single Piston
Rear Brake Ø220 mm (8.7 inches)
Dimensions & Weight
Weight incl.166.0 kg (366.0 pounds)
Seat Height780 mm (30.7 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.
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.
