| MODEL | YAMAHA IT 490 1983 |
| Year | 1983 |
| Engine Type | Two stroke, single cylinder, reed valve |
| Displacement / Capacity | 487 cc / 29.7 cu in |
| Bore X Stroke | 87 x 82 mm |
| Compression Ratio | 6.9:1 |
| Cooling System | Air cooled |
| Max Power | 25.4 kW / 34.65 hp @ 6000 rpm |
| Max Torque | 41.5 Nm / 30.64 lb-ft @ 5500 rpm |
| Ignition | CDI |
| Induction | 38 mm Mikuni carburetor |
| Start System | Kick |
| TRANSMISSION SPECS | |
| Lubrication | — |
| Gear Box | 5-speed |
| Clutch | Wet, multi-plate |
| Final Drive | Chain |
| CHASSIS SPECS | |
| Frame | Single-downtube, full cradle, chrome-moly; box-section aluminium swing arm |
| Front Suspension | 43 mm telescopic forks, 300 mm / 11.8 in travel |
| Rear Suspension | Monoshock, adjustable spring preload and rebound damping, 300 mm / 11.8 in travel |
| Front Brakes | Drum |
| Rear Brakes | Drum |
| DIMENSION SPECS | |
| Overall Length | — |
| Overall Width | — |
| Overall Height | — |
| Seat Height | 942 mm / 37.1 in |
| Wheelbase | 1485 mm / 58.5 in |
| Ground Clearance | 330 mm / 13 in |
| Dry Weight | 125 kg / 275.6 lbs |
| Wet Weight | — |
| WHEEL SPECS | |
| Front Tyre | 3.00 x 21 |
| Rear Tyre | 150/80 x 18 |
| FUEL SYSTEM | |
| Fuel Capacity | 13.6 Litres / 3.6 US gal |
| Fuel Consumption | — |
| Top Speed | — |
A big air-cooled two-stroke single from Yamaha's early-1980s enduro line, built for open trail and off-road riding. It pairs a long-travel monoshock rear end with simple drum brakes and a reed-valve 487 cc engine tuned for torque rather than top-end power.
