AJS Stormer Y4 250 Mk 2 1974 - Specifications & Review

Introducing the 1974 AJS Stormer Y4 250 Mk 2, a motorcycle that stands as a testament to the golden era of cross motocross racing. With a price tag of just US$ 1149, the Stormer Y4 250 Mk 2 was designed for enthusiasts eager to conquer off-road terrains while enjoying a blend of rugged performance and classic British engineering. This bike not only marked AJS's commitment to the competitive motocross scene but also showcased the company’s innovative spirit during a time when two-stroke engines were becoming increasingly favored for their lightweight and powerful characteristics.

At the heart of the Stormer Y4 250 Mk 2 lies a spirited 247cc single-cylinder, two-stroke engine, capable of churning out an impressive 25 HP at 7000 RPM. With a compression ratio of 11.0:1 and a reliable AMAL 32mm carburettor, riders will appreciate the punchy throttle response and exhilarating acceleration that make this machine a joy to ride. The 4-speed gearbox, combined with a wet plate diaphragm clutch, ensures smooth gear changes even in the heat of competition. The lightweight frame, weighing in at just 104.3 kg (230 lbs), coupled with a power-to-weight ratio of 0.2396 HP/kg, allows the Stormer to dart through trails and obstacles with agility and ease, making it an excellent choice for both seasoned racers and adventurous newcomers alike.

The Stormer Y4 250 Mk 2 is adorned with features that enhance both performance and rider comfort. Its double downtube, full cradle frame provides stability while the telescopic front forks offer 7 inches of travel, absorbing the bumps and jolts of rugged terrain. The drum brakes at both the front and rear, while simple, provide reliable stopping power when needed. With a ground clearance of 10 inches and a seat height of 30 inches, this motorcycle is designed to accommodate various riders, making it accessible for many enthusiasts. The eye-catching color scheme of an orange tank, grey frame, and black side panels adds to its aesthetic appeal, ensuring that it stands out on the track or the trails.

Pros:

1. Lightweight and Agile: Weighing just 230 lbs, the Stormer delivers exceptional maneuverability on and off the track.
2. Robust Performance: The two-stroke engine provides a thrilling ride with a responsive throttle, ideal for motocross enthusiasts.
3. Classic Aesthetic: Its distinctive color scheme and vintage design make it a head-turner for collectors and riders alike.

Cons:

1. Drum Brakes: While reliable, drum brakes may not provide the stopping power that modern riders expect from off-road machines.
2. Limited Fuel Capacity: With a fuel tank capacity of only 2 gallons, longer rides may require more frequent refueling stops.
3. Kick Starter: The absence of an electric starter can be a drawback for those who prefer the convenience of modern starting systems.

Overall, the 1974 AJS Stormer Y4 250 Mk 2 is an exciting blend of classic charm and robust performance, making it a must-consider for any motorcycle enthusiast looking to relive the thrill of vintage cross motocross riding.