What is the engine displacement of the 1971 Yamaha YAS1?

The 1971 Yamaha YAS1 has an engine displacement of 125.00 ccm (7.63 cubic inches).

1971 Yamaha YAS1 Price, Specs, Review

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Review

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The 1971 Yamaha YAS1 holds a significant place in the history of lightweight motorcycling, representing an evolution of Yamaha's early two-stroke prowess. Emerging in an era where smaller displacement bikes were crucial for both daily transport and entry-level sport riding, the YAS1 built upon the success of its predecessors. It faced direct competition from machines like the Honda CB125S and Suzuki T125, each vying for market share among riders seeking an accessible and economical two-wheeled experience. This model, in particular, showcased Yamaha's dedication to refined two-stroke engineering, setting a benchmark for its class.

At the heart of the YAS1 was its 125.00 ccm (7.63 cubic inches) engine. This two-stroke, air-cooled parallel twin powerplant was designed for reliable, accessible power delivery. While specific horsepower figures varied slightly by market, the engine's design emphasized a smooth powerband for its displacement, making it manageable for new riders yet engaging enough for more experienced enthusiasts. The 125.00 ccm engine, a common size for the Vintage category, provided sufficient acceleration for navigating urban environments and maintaining pace on secondary roads, embodying the practical performance expected of motorcycles from this era.

Riding the YAS1 offered a straightforward and engaging experience. Its relatively light weight and nimble chassis contributed to easy maneuverability, making it well-suited for city commuting and spirited rides on winding backroads. The ergonomics were generally upright, providing a comfortable posture for extended periods, a common characteristic for many standard motorcycles of the time. Suspension components, while basic by modern standards, were effective for absorbing road imperfections, contributing to a generally compliant ride. The overall feel was one of simplicity and directness, allowing the rider to connect intimately with the machine and the road.

As a Vintage category motorcycle, the 1971 Yamaha YAS1 primarily appeals to collectors, restorers, and enthusiasts of classic Japanese motorcycles. Its straightforward mechanics and availability of parts (both original and reproduction) make it an attractive project bike or a weekend rider for those who appreciate the unadulterated charm of early two-stroke motoring. The YAS1 offers a tangible connection to a pivotal period in motorcycle development, representing a time when lightweight, efficient machines were at the forefront of personal transportation and recreational riding.

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Pros (Advantages)

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✅ Why buy this bike?

The Yamaha YAS1 1971 is known for its reliable and durable two-stroke engine, providing a smooth and powerful performance.
It has a classic and stylish design that appeals to vintage motorcycle enthusiasts.
The handling of the Yamaha YAS1 is nimble and responsive, making it a joy to ride on twisty roads.
This model is relatively lightweight, which enhances its agility and ease of maneuverability.
The Yamaha YAS1 1971 is praised for its comfortable riding position, suitable for both short commutes and longer journeys.

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Cons (Disadvantages)

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⚠️ Things to consider

Limited power output compared to modern motorcycles, which may not satisfy riders looking for high performance.
Outdated suspension technology and handling characteristics that may feel less refined and responsive compared to newer models.
Lack of modern safety features such as ABS, traction control, and advanced braking systems, which could compromise rider safety.
Limited availability of replacement parts due to the age of the motorcycle, which may make maintenance and repairs more challenging and expensive.
Potential for higher maintenance requirements and more frequent breakdowns due to the vintage nature of the bike and wear and tear over time.

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Alternatives

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⚖️ Comparison & Competition

Honda CB350
The Honda CB350 is a classic motorcycle known for its reliability and smooth performance. It features a 325cc twin-cylinder engine, making it a great choice for riders looking for a balance of power and agility.
Suzuki T500
The Suzuki T500 is a two-stroke twin motorcycle that offers a unique riding experience with its distinctive engine sound and strong acceleration. It has a 500cc engine and is popular among vintage motorcycle enthusiasts.
Kawasaki H1 Mach III
The Kawasaki H1 Mach III is a high-performance two-stroke triple motorcycle that was known for its incredible speed and power in the early 1970s. With a 500cc engine, it is a thrilling option for riders seeking a bit of excitement.
BMW R75/5
The BMW R75/5 is a classic German motorcycle known for its durability and comfort. It features a 750cc horizontally opposed twin engine, providing a smooth and stable ride for long-distance touring.
Triumph Bonneville T120
The Triumph Bonneville T120 is an iconic British motorcycle with a rich heritage dating back to the 1950s. It boasts a 650cc parallel-twin engine and offers a blend of vintage styling and modern performance for riders who appreciate classic motorcycles