1972 Allen Millyard 5-Cylinder Kawasaki S1 415cc – Show Condition | One of Only Six Built
This is a truly unique opportunity to own one of the rarest motorcycles ever created – a 5-cylinder Kawasaki S1 415cc custom-built by the legendary Allen Millyard. Based on a 1972 Kawasaki S2 with a 250 S1 engine, this machine was converted into a five-cylinder masterpiece over 20 years ago using two standard triple-cylinder engines.
Fully restored in 2020, the bike remains in mint, show-ready condition. Though it’s never been shown publicly, it looks factory-fresh apart from the beautifully widened engine and stunning one-off stainless 5-into-2 exhaust system – both visual cues to its remarkable engineering.
Millyard confirmed the authenticity of this build from the unique stamp on the motor, remarking that this was the smoothest engine he ever produced. Only six of these engines were ever made, with most now residing in museums in Japan and the US – making this a rare gem of British craftsmanship and motorcycling ingenuity.
Why this prize is special
A once-in-a-lifetime chance to own a genuine Allen Millyard 5-cylinder masterpiece – one of just six ever built and arguably the finest of the lot. This 1972 Kawasaki S2 415cc has been restored to a show-quality standard and is as rare as it is beautiful. Whether you’re a collector, enthusiast, or simply appreciate incredible engineering, this machine is sure to turn heads and stir conversation wherever it goes.
Free UK mainland delivery included.
One of the smoothest and rarest two-stroke engines ever made – crafted by one of Britain’s greatest motorcycle engineers.
Key Features of the 1972 * ALLEN MILLYARD * 5 Cylinder Kawasaki S1 415cc
Engine: 415cc 2-stroke, 5-cylinder, hand-built by Allen Millyard using two Kawasaki triples
Restoration: Full nut-and-bolt restoration completed in 2020
Condition: Mint condition throughout – one of the cleanest Millyard examples in existence
Exhaust: Custom stainless steel 5-into-2 system with signature tone
Rarity: One of only six ever built – authenticated by Millyard himself
Visuals: Subtle but unmistakable – wider engine layout and handcrafted details
Frame & Cycle Parts: Based on a 1972 Kawasaki S2, fully refurbished
History: Engine lay untouched for over a decade before being brought back to life with care and attention to detail
Documentation: Comes with Allen Millyard’s confirmation and background on this specific engine build
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Key Specs
