Yamaha IT490
Yamaha IT490 | |
Manufacturer | |
---|---|
Also called | IT 490 |
Production | 1983 - 1984 |
Class | Enduro |
Predecessor | Yamaha IT465 |
Engine | Two stroke, single cylinder, read valve, air cooled |
Bore / Stroke | 86.4mm x 86.4mm |
Compression ratio | 4.9:1 |
Top Speed | 80 mph |
Horsepower | 35.0 HP (26.1 KW) @ 6000RPM |
Torque | 30.98 ft/lbs (42.0 Nm) @ 5500RPM |
Ignition | cdi |
Spark Plug | NGK B8ES '83-84 |
Transmission | Gear box: 5-Speed Final Drive: Chain |
Final Drive | Chain: 520x110 ‘83-84[1] |
Front Sprocket | 14T ‘83-84[1] |
Rear Sprocket | 44T ‘83-84[1] |
Suspension | Front: 43mm Telescopic adjustable forks Rear: Mono shock, adjustable spring preload and rebound damping |
Brakes | Front: Drum Rear: Drum |
Front Tire | 3.00 -21 |
Rear Tire | 150/80 -18 |
Wheelbase | 56.5 inches (1435 mm) |
Seat Height | 37.2 inches (945 mm) |
Weight | 275.58 pounds (125.0 Kg) (dry), 123.0 kg (wet) |
Recommended Oil | Yamalube 10w-40 |
Fuel Capacity | 3.59 Gallon (13.60 Liters) |
Related | Yamaha IT125, Yamaha IT175, Yamaha IT200, Yamaha IT250, Yamaha IT350, Yamaha IT490, Yamaha IT500, Yamaha YZ490 |
Competition | Honda CR500, Kawasaki KX500 |
Manuals | Service Manual |
The Yamaha IT 490 was a Two stroke, single cylinder, read valve, air cooled Enduro motorcycle produced by Yamaha between 1983 and 1984. Max torque was 30.98 ft/lbs (42.0 Nm) @ 5500 RPM. Claimed horsepower was 35.0 HP (26.1 KW) @ 6000 RPM.
Engine[edit | edit source]
The engine was a air cooled Two stroke, single cylinder, read valve, air cooled. A 86.4mm bore x 86.4mm stroke result in a displacement of just 490.0 cubic centimeters.
Drive[edit | edit source]
The bike has a 5-Speed transmission. Power was moderated via the Wet multi-discs.
Chassis[edit | edit source]
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 43mm Telescopic adjustable forks while the rear was equipped with a Mono shock, adjustable spring preload and rebound damping. The IT 490 was fitted with a 3.59 Gallon (13.60 Liters) fuel tank. The bike weighed just 275.58 pounds (125.0 Kg). The wheelbase was 56.5 inches (1435 mm) long.
1983[edit | edit source]
1984 Yamaha IT 490[edit | edit source]
The big news in the powerplant is the bump in displacement from 465 to 487cc, accomplished simply by increasing the cylinder bore two millimeters. This follows the large, seven-millimeter increase in stroke which boosted the IT's displacement from 425 to 465cc in 1981. Aside from the trendiness involved in increasing their open-classers' engine sizes, most manufacturers are nudging 500cc because more displacement is the most straightforward route to better power.
See Also[edit | edit source]
References[edit | edit source]
- ↑ 1.0 1.1 1.2 2019 Western Power Sports Catalog. Western Power Sports. 2019.
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