What is the engine displacement of the 1970 Yamaha YAS 1?

The 1970 Yamaha YAS 1 has an engine displacement of 125.00 ccm (7.63 cubic inches).

How much horsepower does the 1970 Yamaha YAS 1 have?

The 1970 Yamaha YAS 1 produces 15.00 HP (10.9 kW)) @ 8500 RPM of power.

What is the top speed of the 1970 Yamaha YAS 1?

The 1970 Yamaha YAS 1 has a top speed of 110.0 km/h (68.4 mph).

1970 Yamaha YAS 1 Price, Specs, Review

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Review

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The 1970 Yamaha YAS 1 represents a significant entry in the lightweight motorcycle segment of its era, embodying Yamaha's expanding reach and engineering prowess. As a direct descendant of earlier Yamaha two-stroke twins, it continued to refine the formula for accessible yet spirited riding. In the competitive landscape of the late 1960s and early 1970s, the YAS 1 found itself vying for attention against popular models such as the Suzuki T125 Stinger and the Kawasaki G3SS, all aiming to capture the market of riders seeking nimble and economical transportation with a touch of sporting ambition.

At the heart of the YAS 1 was its 125.00 ccm (7.63 cubic inches) two-stroke engine, a robust and lively powerplant for its class. This engine was capable of producing 15.00 HP (10.9 kW) at a spirited 8500 RPM, translating into a respectable top speed of 110.0 km/h (68.4 mph). Fuel capacity was a practical 9.50 litres (2.51 gallons), offering a decent range for daily commutes and weekend jaunts. These specifications positioned the YAS 1 as a highly capable machine for its displacement, offering performance that could keep pace with many contemporary small-displacement sport bikes.

Riding the Yamaha YAS 1 offered a straightforward and engaging experience. Its relatively light weight and compact chassis contributed to agile handling, making it easy to maneuver through urban environments and winding backroads. The seating position was generally upright, providing a comfortable perch for riders of varying heights, suitable for longer rides without undue strain. Suspension was typical for the period, offering a balance of compliance and support, while the braking system, likely drums front and rear, provided adequate stopping power for its performance capabilities.

Categorized as a Vintage motorcycle today, the 1970 Yamaha YAS 1 would appeal to enthusiasts and collectors who appreciate the simplicity and mechanical honesty of classic two-stroke machines. Its straightforward design and reliable engine make it an approachable vintage bike for those looking to experience the golden age of Japanese motorcycle manufacturing. For someone seeking a piece of motorcycling history that is both rideable and collectible, the YAS 1 offers a compelling proposition, representing a foundational piece of Yamaha's legacy in the global motorcycle market.

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Pros (Advantages)

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✅ Why buy this bike?

The Yamaha YAS 1 1970 is known for its reliable and durable two-stroke engine, providing a good balance of power and efficiency.
It features a sleek and classic design that has stood the test of time, appealing to vintage motorcycle enthusiasts.
The handling and maneuverability of the Yamaha YAS 1 are excellent, making it a joy to ride on twisty roads or in urban environments.
The bike is relatively lightweight, which contributes to its agility and ease of control, especially for newer riders.
Maintenance and servicing for the Yamaha YAS 1 are generally straightforward and parts are still available, making it a practical choice for restoration projects.

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Cons (Disadvantages)

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⚠️ Things to consider

Limited power output compared to modern motorcycles, may not be suitable for high-speed riding.
Outdated suspension and braking technology, potentially compromising safety and handling.
Difficulty in finding replacement parts due to the age of the motorcycle.
Lack of modern features such as ABS, traction control, and other electronic aids found on newer bikes.
Reliability issues may arise due to wear and tear on older components.

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Alternatives

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⚖️ Comparison & Competition

Honda CB750
Introduced in 1969, the CB750 is considered one of the first superbikes and revolutionized the motorcycle industry with its powerful 750cc engine and modern design.
Kawasaki H1 Mach III
Known for its blistering speed, the H1 Mach III was a 500cc 2-stroke triple that was popular in the early 1970s for its raw power and aggressive styling.
Suzuki GT750 Water Buffalo
Launched in 1971, the GT750 was Suzuki's flagship model known for its unique water-cooled 750cc 2-stroke engine, making it a popular choice for touring.
BMW R75/5
A classic touring motorcycle, the R75/5 featured a 750cc air-cooled boxer engine and was praised for its comfortable ride quality and reliability.
Triumph Bonneville T120
A British classic, the Bonneville T120 was powered by a 650cc parallel-twin engine and was renowned for its timeless design and smooth performance