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MotoLibrary Score
46/100Balanced
Power/Weight
0.32 hp/kg
Top Speed
137 km/h
Torque
40 Nm
Engine
397 ccm
Technical Overview
1979 Yamaha IT Technical Analysis & Specification Breakdown
Engineered by Yamaha for the enduro - offroad motorcycle segment, the 1979 Yamaha IT utilizes a 397 cc (24.2 cu in) air-cooled single cylinder, two-stroke layout. In factory specification, peak output is rated at 36.7 HP (26.8 kW) at 6,500 rpm while maximum torque reaches 40.2 Nm (29.7 lb-ft), transferring power to the rear wheel through a 6-speed gearbox and chain final drive. With a specific output of 92.4 HP per liter, 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 measures 113.4 kg (250 lbs) dry, translating to a power-to-weight ratio of 0.32 HP/kg (3.09 kg per horsepower). Rider ergonomics and chassis geometry center around a 1,420 mm (55.9 in) wheelbase engineered for balanced agility and highway composure. The 12-liter (3.2 US gal) fuel tank supports practical everyday commuting and weekend road stints, while factory top speed is listed at 137 km/h (85 mph).
Specific Output
92.4 HP/L
Power-to-Weight
0.32 HP/kg (3.09 kg/HP)
Engine
Displacement397.0 ccm (24.22 cubic inches)
Engine TypeSingle cylinder, two-stroke
Engine DetailsSingle cylinder, two-stroke
Power36.7 HP (26.8 kW)) @ 6500 RPM
Torque40.2 Nm (4.1 kgf-m or 29.7 ft.lbs)
Compression7.9:1
Bore x Stroke85.0 x 64.0 mm (3.3 x 2.5 inches)
Fuel SystemCarburettor. Mikuni, 26mm
Fuel ControlPort control
IgnitionMagneto type
LubricationPre mix
CoolingAir
Transmission
Gearbox6-speed
Final DriveChain (final drive)
ClutchWet multiple disc
Performance
Top Speed136.8 km/h (85.0 mph)
ExhaustUpswept expansion chamber with USFS-approved spark arrestor and silencer
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.
