Yamaha IT 490 (1977-78)

The Yamaha IT 490 motorcycle was produced in 1977-78 and had a two-stroke, single cylinder, read valve engine with a capacity of 396cc. The bore and stroke were 85mm x 70mm with a compression ratio of 7.6:1. The bike had a VM38SS Mikuni carburetor and CDI ignition, with a kick-start. It could produce a maximum power of 40hp/29.8kW at 7000 rpm and maximum torque of 30.9 lb-ft/41.8Nm at 6000 rpm. The motorcycle had a 5-speed transmission and chain final drive. The front suspension consisted of 43mm telescopic adjustable forks with 300mm/11.8in of front wheel travel. The rear suspension had a mono-shock with adjustable spring preload and rebound damping with 300mm/11.8in of rear wheel travel. The brakes were drum on both the front and rear wheels. The front tyre size was 3.00-21 and the rear tyre was 150/80-18. The rake was 31.5 degrees with a trail of 142mm/5.5in, a wheelbase of 1430mm/56.2in, and a ground clearance of 240mm/9.4in. Its dry weight was 115kg/253.5lbs, and it had a fuel capacity of 13.6 litres/3.4 US gal.

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Technical specifications:

Make Model: Yamaha IT 400

Year: 1977 – 78

Engine: Two stroke, single cylinder, read valve

Capacity: 396 cc / 24.1 cu-in

Bore x Stroke: 85 x 70 mm

Cooling System: Air cooled

Compression Ratio: 7.6:1

Induction: VM38SS Mikuni carburetor

Ignition: CDI

Starting: Kick

Max Power: 40 hp / 29.8 kW @ 7000 rpm

Max Torque: 30.9 lb-ft / 41.8 Nm @ 6000 rpm

Transmission: 5 Speed

Final Drive: Chain

Front Suspension: 43mm Telescopic adjustable forks

Front Wheel Travel: 300 mm / 11.8 in

Rear Suspension: Mono shock, adjustable spring preload and rebound damping

Rear Wheel Travel: 300 mm / 11.8 in

Front Brakes: Drum

Rear Brakes: Drum

Front Tyre: 3.00 -21

Rear Tyre: 150/80 -18

Rake: 31.5 degrees

Trail: 142 mm / 5.5 in

Wheelbase: 1430 mm / 56.2 in

Ground Clearance: 240 mm / 9.4 in

Dry Weight: 115 kg / 253.5 lbs

Fuel Capacity: 13.6 Litres / 3.4 US gal