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MotoLibrary Score
43/100Commuter
Power/Weight
0.28 hp/kg
Torque
42 Nm
Engine
487 ccm
Technical Overview
1983 Yamaha IT 490 Technical Analysis & Specification Breakdown
Engineered by Yamaha for the enduro - offroad motorcycle segment, the 1983 Yamaha IT 490 relies on a 487 cc (29.7 cu in) air-cooled single cylinder, two-stroke powerplant. In factory specification, peak output is rated at 35 HP (25.5 kW) at 6,000 rpm while maximum torque reaches 42 Nm (31 lb-ft) at 5,500 rpm, transferring power to the rear wheel through a 5-speed gearbox and chain final drive. With a specific output of 71.9 HP per liter and a 500 rpm working window between peak torque (5,500 rpm) and peak power (6,000 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 IT 490 measures 125 kg (276 lbs) dry, translating to a power-to-weight ratio of 0.28 HP/kg (3.57 kg per horsepower). The 13.6-liter (3.6 US gal) fuel tank supports practical everyday commuting and weekend road stints.
Specific Output
71.9 HP/L
Power-to-Weight
0.28 HP/kg (3.57 kg/HP)
Power Band Window
5,500–6,000 rpm
Engine
Displacement487.0 ccm (29.72 cubic inches)
Engine TypeSingle cylinder, two-stroke
Engine DetailsSingle cylinder, two-stroke
Power35.0 HP (25.5 kW)) @ 6000 RPM
Torque42.0 Nm (4.3 kgf-m or 31.0 ft.lbs) @ 5500 RPM
Compression4.9:1
Bore x Stroke87.0 x 82.0 mm (3.4 x 3.2 inches)
Fuel SystemCarburettor. 38mm Mikuni
IgnitionCDI
CoolingAir
Transmission
Gearbox5-speed
Final DriveChain (final drive)
Chassis
Front Suspension43mm Telescopic adjustable forks
Front Travel300 mm (11.8 inches)
Rear SuspensionMono shock, adjustable spring preload and rebound damping
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.
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.
