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.
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 |
