Engine # G83223 (stamped on engine)
Frame # F/54450 (back downtube under saddle)
Looking at The Vintage Motorcycle Club Machine Register from 1976 indicates that AJS bikes were manufactured with the same frame and engine number. It was therefore likely this bike consists of a 1925 frame with a 1926 engine. Such swaps were not unusual during a bike’s long lifetime.
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.
MILEAGE: No odometer, mileage unknown.
PAINT: The bike was repainted during a restoration that took place approximately forty years ago. The paint still shows well with minimal flaws noted.
SHEET METAL: Believed to be all original – no dents or dings noted. The petrol tank appears to have been repaired around the gear change connection.
CHROME: There is minimal chrome/nickel plating on the bike. What is present is in good condition and in need of a polish.
MECHANICAL: The motorcycle has been off the road for roughly three decades and will require recommissioning, including cable inspection, lubrication, and attention to tires, brakes, and steering. While it currently lacks lighting equipment, a period gas headlamp and taillight could be added to complete its specification. This may be available in an unopened spares box that I have. The engine is free and kicks-over.
WHEELS & TIRES: It is believed the rims are original. The wheel rims and spokes are painted black. The front and rear tires are beaded-edge Dunlop Motorcycle Cord Extra Heavy 26 x 3. The tires are hard and cracked but period correct for the bike. The tubes are intact, and both tires hold air.
OTHER: The handlebar rubbers are in poor condition.
TITLE: No title. A bill of sale can be provided. Title available for a fee.
Recent sales. Some recent international sales establish a value indicated in the price range.
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Hagerty does not show this model in its 1925 values. Therefore 1927 Values utilized.
#1 Concours condition: $24,300
#2 Excellent condition: $18,700
#3 Good condition: $15,600*
#4 Fair condition: $11,000
ACCESSORIES: Video of the bike in England and import papers.
PRICE: Offered on the range of $16,385 To $20,944 with a Buy Now of $23,038
