Yamaha IT 490 (1983) vs Yamaha IT 400 (1977-78)
Comparison technical specifications
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| Make: | Yamaha | Yamaha |
| Model: | IT 490 | IT 400 |
| Years: | 1983 | 1977-78 |
| Engine: | Two stroke, single cylinder, read valve | Two stroke, single cylinder, read valve |
| Capacity: | 487 cc / 29.7 cu-in | 396 cc / 24.1 cu-in |
| Bore x Stroke: | 87 x 82 mm | 85 x 70 mm |
| Cooling System: | Air cooled | Air cooled |
| Compression Ratio: | 4.9;1 | 7.6:1 |
| Induction: | VM38SS Mikuni carburetor | VM38SS Mikuni carburetor |
| Ignition: | CDI | CDI |
| Max Power: | 35 hp @ 6000 rpm | 40 hp / 29.8 kW @ 7000 rpm |
| Max Torque: | 31 lb-ft @ 5500 rpm | 30.9 lb-ft / 41.8 Nm @ 6000 rpm |
| Transmission: | 5 Speed | 5 Speed |
| Final Drive: | Chain | Chain |
| Front Suspension: | 43mm Telescopic adjustable forks | 43mm Telescopic adjustable forks |
| Front Wheel Travel: | 300 mm / 11.8 in | 300 mm / 11.8 in |
| Rear Suspension: | Mono shock, adjustable spring preload and rebound damping | Mono shock, adjustable spring preload and rebound damping |
| Rear Wheel Travel: | 300 mm / 11.8 in | 300 mm / 11.8 in |
| Front Brakes: | Drum | Drum |
| Rear Brakes: | Drum | Drum |
| Front Tyre: | 3.00 -21 | 3.00 -21 |
| Rear Tyre: | 150/80 -18 | 150/80 -18 |
| Rake: | 28° | 31.5° |
| Trail: | 125 mm / 4.9 in | 142 mm / 5.5 in |
| Wheelbase: | 1435 mm / 56.5 in | 1430 mm / 56.2 in |
| Ground Clearance: | 332 mm / 13.1 in | 240 mm / 9.4 in |
| Dry Weight: | 112.5 kg / 248 lbs | 115 kg / 253.5 lbs |
| Fuel Capacity: | 13.6 Litres / 3.6 US gal | 13.6 Litres / 3.4 US gal |