Yamaha AS 1

The 1968 Yamaha AS1 marks a significant point in Yamaha's lightweight sportbike lineage, building on the success of earlier models and setting a precedent for future two-stroke twins. Introduced at a time when the 125cc segment was fiercely competitive, the AS1 aimed to capture the market with its sporty aspirations and accessible performance. It directly challenged contemporaries like the Suzuki T125 Stinger and the Honda CB125, offering a distinct two-stroke alternative to the burgeoning four-stroke options. This model quickly gained a reputation for its lively character and became a popular choice for riders seeking an agile and fun machine.

Underpinning the AS1's spirited nature was its 125.0 ccm (7.63 cubic inches) twin, two-stroke engine. This powerplant was capable of producing a respectable 12.7 Nm (1.3 kgf-m or 9.4 ft.lbs) of torque at 8000 RPM, delivering a strong pull through its rev range. The lightweight design contributed to its impressive top speed of 120.7 km/h (75.0 mph), making it one of the faster 125s of its era. Weighing in at a mere 98.0 kg (216.0 pounds) dry, the AS1 offered an excellent power-to-weight ratio. Its 9.46 litres (2.50 US gallons) fuel tank provided a decent range for its class, ensuring extended rides between fill-ups.

Riding the AS1 was an engaging experience, characteristic of lightweight sportbikes of the late 60s. Its compact dimensions and low weight translated to nimble handling, making it adept at navigating winding roads and urban environments alike. While not equipped with track-focused ergonomics in the modern sense, the riding position was sporty for its time, encouraging an active interaction with the machine. The two-stroke twin delivered a distinctive exhaust note and a punchy power delivery that was both addictive and confidence-inspiring for its target demographic. Comfort was reasonable for a small-displacement machine, prioritizing agility over plush touring capabilities.

The Yamaha AS1 primarily targeted younger riders, enthusiasts, and commuters looking for an affordable yet performance-oriented motorcycle. Its blend of lightweight design and spirited two-stroke power made it an appealing choice for those stepping up from smaller machines or seeking a fun weekend ride. Today, the AS1 is a sought-after classic, appreciated for its historical significance and the pure riding experience it offers. It represents a pivotal moment in Yamaha's commitment to producing capable and enjoyable two-stroke motorcycles for the masses.