Yamaha IT400

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Yamaha IT 400
Production 1978
Class Enduro
Single cylinder, two stroke, air-cooled
Bore / Stroke 83.8mm x 83.8mm
Compression ratio 7.6:1
Top Speed 78 mph
Horsepower 39.96 HP (29.8 KW) @ 7000RPM
Torque 30.98 ft/lbs (42.0 Nm) @ 6000RPM
Spark Plug NGK B8EV '76-78 , '79
Transmission Gear box: 5-Speed

Final Drive: Chain

Clutch: Wet multi-discs
Final Drive Chain: 520x106 ‘76-78[1]
Front Sprocket 15T ‘76-78[1]
Rear Sprocket 46T ‘76-78[1]
Suspension Front: Telescopic forks
Rear: Monoshock
Brakes Front: Drum
Rear: Drum
Front Tire 3.00-21
Rear Tire 150/80-18
Wheelbase 56.3 inches (1430 mm)
Weight 126.0 kg (wet)
Recommended Oil Yamalube 10w-40
Manuals Service Manual

The Yamaha IT 400 was a Single cylinder, two stroke, air-cooled Trial motorcycle produced by Yamaha in 1978. Max torque was 30.98 ft/lbs (42.0 Nm) @ 6000 RPM. Claimed horsepower was 39.96 HP (29.8 KW) @ 7000 RPM.


A 83.8mm bore x 83.8mm stroke result in a displacement of just 398.0 cubic centimeters.


The bike has a 5-Speed transmission. Power was moderated via the Wet multi-discs.


It came with a 3.00-21 front tire and a 150/80-18 rear tire. Stopping was achieved via Drum in the front and a Drum in the rear. The front suspension was a Telescopic forks while the rear was equipped with a Monoshock. The wheelbase was 56.3 inches (1430 mm) long.


1976 Yamaha IT400 in Blue
1976 Yamaha IT400 in Blue
1976 Yamaha IT400 in Blue

1978 Yamaha IT 400[edit]

1978 Yamaha IT 400 1978 Yamaha IT 400 1978 Yamaha IT 400 1978 Yamaha IT 400 1978 Yamaha IT 400

The IT 400 motorcycle design is a tough nut for any manufactured to track. Punching the IT through tight wooded sections is easy.


  1. 1.0 1.1 1.2 2019 Western Power Sports Catalog. Western Power Sports. 2019.