Yamaha YZ490: history, specs, pictures

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Yamaha YZ490
1982 Yamaha YZ490J in Yellow
Manufacturer Yamaha
Production 82-90
Predecessor Yamaha YZ465
Engine 490
Sparkplug NGK B9EG '82 , '83-85 , '86-87
NGK B8EG '88-90
Front Tire 3.00-21 '82
80/100-21 '86-87 , '88-90
100/90-21 '83-85
Rear Tire 140/80-18 '83-85
110/100-18 '88-90
140/90-18 '82
80/100-18 '86-87
Related Yamaha IT490
Manuals Service Manual
Tech Specs · Brochures · Reviews · Ads · Videos

The Yamaha YZ490 is a motorcycle produced by Yamaha from 1982 to 1990.

Yamaha introduced the YZ 490 in 1982, after a solid run with the YZ465.

Problems[edit]

Sadly, the 490 was heavier than the 465, nowhere near as reliable, horribly difficult to start (hot or cold), came with a grim suspension, vibrated enough to bring blisters to your hands and was impossible to jet.

If you jetted it rich enough to keep this dog from seizing, it would blubber, puke, foul plugs and produce no power. If you jetted it to run strong, it would invariably seize. It came with air leaks, a wandering ignition, gimpy motor mounts and the worst case of Yamahop at high speeds since the original DT-1. Yamaha issued a mountain of service bulletins to try to fix the problems. None of them worked.


1982[edit]


1983[edit]



1984[edit]


1985[edit]


See Also[edit]


Yamaha YZ490
Manufacturer Yamaha
Also called YZ 490
Production 1987
Class All
Engine single cylinder, two-stroke
Horse Power 53.77 HP (40.1 KW) @ 7000RPM
Fuel system carburetor
Transmission Gear box: 5-speed

Final Drive: chain

Clutch: wet plate
Brakes Front: single disc
Rear: expanding brake (drum brake)
Weight 235.89 pounds (107.0 Kg)
Manuals Service Manual
Tech Specs · Brochures · Reviews · Ads · Videos

The Yamaha YZ490 was a single cylinder, two-stroke All motorcycle produced by Yamaha in 1987. Claimed horsepower was 53.77 HP (40.1 KW) @ 7000 RPM.

Engine[edit]

The engine was a air cooled single cylinder, two-stroke.

Drive[edit]

The bike has a 5-speed transmission. Power was moderated via the wet plate.

Chassis[edit]

Stopping was achieved via single disc in the front and a expanding brake (drum brake) in the rear. The bike weighed just 235.89 pounds (107.0 Kg).

In Media[edit]