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Yamaha YZ 490
1987
1987
The 1987 Yamaha YZ 490 represents a significant chapter in the history of open-class two-stroke motocross machines. As the final iteration of a long-running lineage of big-bore YZ models, it faced stiff competition in an era dominated by powerful, often unruly, dirt bikes. Direct competitors included machines like the Honda CR500R and the Kawasaki KX500, all vying for supremacy on the toughest motocross tracks of the time. This particular model year, while not radically different from its immediate predecessors, solidified its place as a formidable, albeit challenging, contender in the motocross world before the eventual shift towards four-stroke dominance.
At the heart of the 1987 YZ 490 was its potent 490.0 ccm (29.90 cubic inches) single-cylinder, two-stroke engine. This large displacement engine was known for its raw power delivery, characteristic of two-strokes of that era. Despite its substantial engine size, the bike maintained a relatively manageable dry weight of 107.0 kg (236.0 pounds). This power-to-weight ratio contributed to its aggressive acceleration and ability to clear large jumps with ease. The engine's simplicity, being a two-stroke, meant fewer moving parts and a distinct powerband that required precise throttle control from the rider.
Riding the YZ 490 was an experience that demanded respect. Its riding characteristics were defined by its powerful engine and a chassis designed for aggressive off-road use. Riders experienced an upright stance, typical of motocross bikes, providing ample leverage for maneuvering. While not lauded for plush comfort, its suspension components were built to absorb the harsh impacts of motocross tracks, offering sufficient travel and damping for its intended purpose. The bike's overall feel was one of raw, untamed power, requiring a skilled hand to harness its full potential over varied terrain.
The 1987 Yamaha YZ 490 was primarily aimed at experienced motocross racers and serious enthusiasts who sought the ultimate in two-stroke power. Its demanding nature meant it wasn't a bike for beginners, but rather for those who could master its considerable output and distinctive power delivery. In retrospect, the YZ 490 stands as an iconic representation of the golden age of open-class two-stroke motocross, a machine that embodied the brute force and thrilling challenge of the sport before the landscape began to shift dramatically.
✅ Why buy this bike?
• Immense low-end torque and horsepower, making it a holeshot king in its era. • Relatively simple two-stroke design, allowing for easier home maintenance and rebuilds. • Classic, iconic '80s motocross styling with a strong vintage appeal for collectors. • Robust and durable engine components, built to withstand the rigors of competitive motocross. • Good parts availability for many common wear items due to its popularity. • Can be a thrilling and challenging ride for experienced riders, rewarding precise throttle control.⚠️ Things to consider
• Brutal power delivery can be difficult to manage, especially for less experienced riders. • Dated suspension technology (conventional forks, basic rear shock) offers limited adjustability and comfort. • Heavy compared to modern motocross bikes, impacting agility and rider fatigue. • Poor braking performance from drum brakes (front and rear) by modern standards. • High vibration levels due to its large single-cylinder two-stroke engine.Rule of thumb: under 125cc / 15HP → A1, under 47HP → A2, above → A.
Estimated average for 490cc class: 45-60 mpg (4.0-5.5 L/100km)
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