What is the engine displacement of the 1928 AJS 6 Bigport?

The 1928 AJS 6 Bigport has an engine displacement of 349.0 ccm (21.30 cubic inches).

1928 AJS 6 Bigport Price, Specs, Review

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Review

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The 1928 AJS G 6 Bigport represents a significant piece of motorcycle history. Its 349cc engine would have been considered a substantial displacement for its time, indicative of its sporting aspirations. While detailed specifications are limited, the Bigport designation suggests a focus on improved engine breathing and performance compared to standard models. The design and engineering reflect the era's emphasis on simplicity and mechanical ingenuity. Given the period, the motorcycle would have likely featured a rigid frame and rudimentary suspension, prioritizing direct feedback and rider involvement. The riding experience would have been raw and demanding, requiring skill and attention from the rider. Features such as electric starting and sophisticated electronics were non-existent, requiring a hands-on approach to maintenance and operation. The AJS G 6 Bigport would have appealed to enthusiasts seeking a thrilling and engaging riding experience, showcasing the pinnacle of motorcycle technology of its era. Its historical significance and classic design make it a desirable machine for collectors and vintage motorcycle aficionados.

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Pros (Advantages)

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✅ Why buy this bike?

• Historically significant AJS model, representing early British motorcycle engineering innovation and heritage. • Big-port cylinder head design offered enhanced breathing for a 1928 single, yielding respectable power. • Relatively simple mechanicals make for easier maintenance and repair for a period motorcycle. • Distinctive vintage appearance, a true head-turner at classic motorcycle events and rallies. • Potentially sound investment, as rare and original pre-war motorcycles appreciate in value. • Engaging riding experience, connecting the rider directly to early motorcycling's mechanical feel.

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Cons (Disadvantages)

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⚠️ Things to consider

• Limited top speed and acceleration by modern standards, unsuitable for contemporary traffic. • Basic braking system (often drum front, block rear) requires significant foresight and stopping distance. • Lack of suspension refinement leads to a harsh ride over anything but perfectly smooth roads. • Scarcity of original parts makes repairs and restoration challenging and potentially very expensive. • High maintenance demands, requiring frequent adjustments, lubrication, and mechanical sympathy. • Primitive lighting system offers minimal illumination for night riding, limiting usability.

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License Class (EU)

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Rule of thumb: under 125cc / 15HP → A1, under 47HP → A2, above → A.

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Fuel Economy & Running Costs

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Estimated average for 349cc class: 45-60 mpg (4.0-5.5 L/100km)

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Insurance Class

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Insurance grouping for AJS 6 Bigport (349cc):