The AJS “Big Port” was one of the defining overhead-valve singles of the mid-1920s, earning its nickname from the large exhaust port that improved breathing and made it a formidable competition machine. Introduced in 1925, the 350 cc Big Port quickly became a favorite in trials, grass-track, and hill-climb events, cementing AJS’s reputation for fast and durable sporting motorcycles.
This particular machine was once owned by Ed Hewitt, a keen competitor and secretary of a vintage motorcycle club in the 1940s. He used the bike in the famous Banbury Run and continued to race it in grass-track and hill-climb events. After Hewitt’s passing, the AJS changed hands, being acquired by Mike Hawkins around 2002. Although Hewitt’s awards did not accompany the sale, the motorcycle still carries the aura of its active competition past.
Mechanically, the Big Port is designed for performance. An inch-and-seven-eighth exhaust pipe, combined with a lightweight 200-pound chassis, allows speeds of up to 80 mph, which is exceptional for a 350cc machine of its day. Power is delivered through a three-speed gearbox geared for distinct low, middle, and high ratios. Lubrication is provided by an automatic oil pump supplemented by a manual lever for an extra dose when needed under racing conditions.
The model’s carburetion is one of its key factors in achieving speed. This overhead-valve version is fitted with a larger Binks carburetor, specially designed for AJS, which provides noticeably improved fuel delivery compared to the 350 side-valve model. A steering damper using asbestos or leather friction plates minimizes handlebar slap at speed, a common issue on lightweight high-performance singles.
Due to its competitive background, this AJS features period modifications. A twist grip now controls the ignition advance and retard, modern levers have replaced the original ball-ended types for hill-climb use, and the rear stand should be secured to the mudguard with a clip—although the mudguard’s current height is not optimal.
Today, this 1926 AJS Big Port remains an evocative link to the golden age of British club competition—a lightweight, lively machine with a rich history behind it and the potential to thrill again in the right hands.
Guide Price: $13,900 – $15,800
Mike Hawkins talks about this motorcycle shortly before it was exported to the USA in 2008.