AJS Motorcycles (1911–Present)

Origins of a Legendary British Marque

The AJS story starts in Wolverhampton, England, where the Stevens brothers—Harry, George, Jack, and Joe— experimented with petrol engines as early as 1897 in their father’s engineering works. In 1909 they founded AJS, named for Albert John Stevens (Jack), and quickly earned a reputation for well-engineered motorcycles, tricars, and light cars.

By 1914 AJS had arrived on the racing scene, entering the Isle of Man Junior TT with 350 cc side-valve machines featuring all-chain drive and two-speed gearboxes. Eric and Cyril Williams delivered a sensational 1–2 finish, with Eric setting the fastest lap at over 47 mph.

Triumphs on the Isle of Man

The 1920s cemented AJS as a TT powerhouse: Cyril Williams won the 1920 Junior TT, while in 1921 Eric Williams and H. R. Davies finished 1–2. Davies then stunned the paddock by winning the Senior TT on a 350 cc AJS. Another 1–2 followed in 1922, and Jimmy Guthrie added the 1930 Lightweight TT. On the road, the celebrated 350 cc “Big Port” OHV sports model became a rider favourite.

Innovation and Challenges

In 1926, AJS unveiled chain-driven overhead-cam racers, underscoring its engineering ambition. Diversification into cars, buses, trucks, and even radios over-stretched the firm, and in 1931 AJS was sold to the Collier brothers of Matchless, forming Associated Motor Cycles (AMC). Under AMC, the experimental OHC V-four appeared (shown at Olympia in 1935), blisteringly quick but hampered by handling.

Post-War Racing Legends

After WWII, AJS launched modern 350 cc and 500 cc singles with Teledraulic forks and later swinging-arm suspension. The headline act was the radical 500 cc DOHC “Porcupine”. In 1949, Les Graham won the first-ever 500 cc World Championship on a Porcupine, etching AJS into racing lore.

Alongside it, the AJS 7R “Boy Racer”—a 350 cc OHC single—became the privateer’s weapon of choice. Between 1950 and 1965, riders won the Junior Manx Grand Prix ten times on 7Rs, making it a backbone of European Junior-class racing.

Beyond the Racetrack

AJS excelled in trials and motocross too. The marque’s 350 cc and 500 cc singles earned a reputation for durability and balance. While post-war roadsters can look conservative today, they matched the tastes of the time and sold strongly at home and abroad.

Decline and Closure

Lightweight 250 cc and 350 cc models arrived in 1958, but the 1960s brought falling sales and management woes. AMC collapsed in 1967 and was taken over by Manganese Bronze Holdings. Production of AJS machines largely ceased, though Villiers-engined motocross models carried the name briefly into the early 1970s.

The Modern AJS Brand

The AJS name survived thanks to Fluff Brown, a former factory race mechanic who acquired the rights in the 1970s and revived AJS via competition machines such as the AJS Stormer. Today, AJS Motorcycles Ltd. remains a UK-based, family-run company offering primarily 50 cc and 125 cc mopeds, scooters, and learner-legal motorcycles—modern, lightweight commuter bikes that proudly wear the historic AJS badge.

One of the most popular models is the AJS Cadwell 125 , a retro-styled 125 cc motorcycle inspired by the brand’s classic racing heritage.

Legacy of AJS

From 1920s TT glory to the 1949 World Championship, AJS stands for British engineering flair and racing spirit. Although the original manufacturer closed more than half a century ago, the AJS name still rides on, linking new riders to one of motorcycling’s most storied marques.