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MotoLibrary Score
47/100Balanced
Power/Weight
0.45 hp/kg
Torque
40 Nm
Engine
426 ccm
Technical Overview
2002 Yamaha YZ 426 F Technical Analysis & Specification Breakdown
Engineered by Yamaha for the cross - motocross motorcycle segment, the 2002 Yamaha YZ 426 F pairs a 426 cc (26 cu in) liquid-cooled single cylinder, four-stroke architecture with road-focused gearing. In factory specification, peak output is rated at 47 HP (34.3 kW) at 9,800 rpm while maximum torque reaches 40 Nm (29.5 lb-ft) at 7,800 rpm, transferring power to the rear wheel through a 5-speed gearbox and chain final drive. With a specific output of 110.3 HP per liter and a 2,000 rpm working window between peak torque (7,800 rpm) and peak power (9,800 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 YZ 426 F measures 105 kg (231 lbs) dry, translating to a power-to-weight ratio of 0.45 HP/kg (2.23 kg per horsepower). Rider ergonomics and chassis geometry center around a 998 mm (39.3 in) seat height — reflecting a long-travel chassis stance that favors ground clearance and off-pavement control, combined with a 1,490 mm (58.7 in) wheelbase engineered for balanced agility and highway composure. The 8-liter (2.1 US gal) fuel tank supports practical everyday commuting and weekend road stints.
Specific Output
110.3 HP/L
Power-to-Weight
0.45 HP/kg (2.23 kg/HP)
Power Band Window
7,800–9,800 rpm
Standover Height
998 mm (39.3 in)
Engine
Displacement426.0 ccm (25.99 cubic inches)
Engine TypeSingle cylinder, four-stroke
Engine DetailsTitanium valves
Power47.0 HP (34.3 kW)) @ 9800 RPM
Torque40.0 Nm (4.1 kgf-m or 29.5 ft.lbs) @ 7800 RPM
Compression12.5:1
Bore x Stroke95.0 x 60.1 mm (3.7 x 2.4 inches)
Valves/Cylinder5
Fuel SystemCarburettor. Keihin
Fuel ControlDouble Overhead Cams/Twin Cam (DOHC)
Ignitiondigital CDI
CoolingLiquid
Max RPM11600
Transmission
Gearbox5-speed
Final DriveChain (final drive)
ClutchWet, multiple discs, cable operated
Chassis
Front SuspensionKayaba cartridge upside-down
Front Travel300 mm (11.8 inches)
Rear SuspensionKayba single shock
Rear Travel315 mm (12.4 inches)
Wheelbase1490 mm (58.7 inches)
Ground Clearance375 mm (14.8 inches)
Wheels & Brakes
Front Tyre80/100-21
Rear Tyre110/90-19
Front BrakesSingle disc
Front Brake Ø250 mm (9.8 inches)
Rear BrakesSingle disc
Rear Brake Ø240 mm (9.4 inches)
Dimensions & Weight
Dry Weight105.0 kg (231.5 pounds)
Power/Weight0.4476 HP/kg
Seat Height998 mm (39.3 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.
