- Engine: Eight-liter V10 from a Dodge Viper, approximately 500 HP (368 kW) and 712 Nm (525 lb-ft)
- Estimated value: 100,000 to 150,000 pounds (approximately 116,000 to 174,000 euros / 132,000 to 198,000 US dollars)
- Auction: July 22, 2026, H&H Classics, National Motorcycle Museum Solihull
British engineer and custom-build specialist Allen Millyard is parting with one of his most famous creations. His Viper V10, a road-legal motorcycle powered by a complete V10 engine from a Dodge Viper, will change hands through the auction house H&H Classics. According to Millyard, this marks the first time he is offering one of his builds directly through an auction house himself.
What Is the Millyard Viper V10?
The Millyard Viper V10 is a one-of-a-kind machine that Allen Millyard built around an eight-liter V10 engine from a Dodge Viper. Millyard is known as a builder of extraordinary motorcycles and appears on the television show “The Motorbike Show.”
The engine comes from the Dodge Viper supercar and also serves as the motorcycle’s structural backbone. A tubular steel subframe is bolted to the front of the engine, and an aluminum subframe to the rear. The single-sided swingarm is mounted directly to the gearbox. The engine alone reportedly weighs about as much as a complete Honda Gold Wing, giving some idea of the machine’s dimensions.
How Much Power Does the Viper V10 Have?
The Viper V10 produces approximately 500 HP (368 kW) and delivers 712 Nm (525 lb-ft) of torque. These figures are provided by auction house H&H Classics for the engine.
To ensure the chassis and ancillary components can handle these forces, Millyard custom-made numerous parts or repurposed components from other vehicles. The front fork is a bespoke design using 75-millimeter hydraulic cylinders from JCB construction machinery. The damper rods are converted units from a Vauxhall Carlton, paired with Hagon springs. At the rear, two revalved Yamaha R1 shock absorbers do the work. The exhaust headers are hand-fabricated and ceramic-coated, while the silencers are modeled on those of a Suzuki TL1000S.
What Speed Records Does the Machine Hold?
The Viper V10 reached approximately 333 km/h (207 mph) during a high-speed test on a runway and also holds a Guinness World Record for tandem motorcycles. According to media reports, tester Bruce Dunn was in the saddle for the top-speed run, with the officially recorded best mark standing at 207.101 mph.
Millyard set the tandem world record together with “Motorbike Show” presenter Henry Cole, who rode as pillion passenger. In May 2023, the duo completed an officially timed run of approximately 295 km/h (183.5 mph) at Elvington Airfield in North Yorkshire, beating the previous record by nearly five miles per hour. Despite being designed as a record-breaking machine, the Viper V10 is registered and road-legal in the United Kingdom. Millyard has covered more than 9,000 miles (approximately 14,500 kilometers) on it, including trips to Guernsey, the Isle of Wight, and the Isle of Man, where he rode the TT course on the machine. In total, only three people are said to have ridden the Viper V10: Millyard himself, and testers Bruce Dunn and Trevor Franklin.
How Was the Viper V10 Built?
The Viper V10 began with a V10 engine that Millyard acquired in 2004 from a 1995 Dodge Viper GTS. Several years passed between the purchase and the motorcycle receiving road registration in 2009, during which Millyard advanced the build step by step.
He started the actual construction in earnest in 2007, with the chassis completed by Christmas of that year. The total working time on the project reportedly amounted to about one year, and the machine was finished in July 2009. Millyard had originally set a target top speed of approximately 402 km/h (250 mph); the actual figure achieved was the aforementioned 207 mph. As early as 2001, Millyard had built a V8 motorcycle, which he later sold.
The Viper V10 Compared to Other V10 Motorcycles
Motorcycles with V10 engines are rare because car engines are usually too heavy and too bulky to fit into a two-wheeler. The best-known reference point is the Dodge Tomahawk, which the manufacturer presented as a concept in 2003.
The Tomahawk combined an 8.3-liter V10 from the Dodge Viper with four narrow wheels and was not approved for public road use. Only a few examples, reportedly not fully roadworthy, are said to have been sold at prices around 487,000 euros (555,000 US dollars). The main road-legal alternatives with large-displacement engines are the V8 models from Boss Hoss. Within this landscape, the Viper V10 stands out as a road-registered custom build with a V10 engine. According to the auction house, the motorcycle has its own Wikipedia entry and has been featured repeatedly in national newspapers.
When and Where Will the Millyard Viper V10 Be Auctioned?
The Millyard Viper V10 will be auctioned on July 22, 2026, starting at 10 AM local time at the National Motorcycle Museum in Solihull. The auction is conducted by H&H Classics, with an estimated value between 100,000 and 150,000 pounds (approximately 116,000 to 174,000 euros / 132,000 to 198,000 US dollars).
The estimated value does not include buyer’s premium or VAT. Millyard explained his decision on social media: “I’ve decided to offer my 8000cc Millyard Viper V10 up for sale at the next H&H auction at the National Motorcycle Museum UK on the 22nd July 2026. This has been a very difficult decision for me to make, but it will make way for more exciting projects in the future.” He describes his reasons as mixed: the machine takes up a lot of space and requires ongoing maintenance effort, while at the same time he finds more excitement in building than in owning. He says he hopes a museum or a collector will take on the machine, and he is already planning his next project.
In addition to the Viper V10, several other Millyard builds will be offered at the same auction, consigned by their current owners. These include a 1978 Kawasaki S1 550, created from two 250cc three-cylinder engines with joined crankcases and a custom crankshaft; a 1974 Honda SS250 based on a Honda SS50 with a 2006 Kawasaki KX250F engine; and a 1972 Kawasaki S2 with a five-cylinder engine of 415 cc built by Millyard.
Frequently Asked Questions
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How much does the Millyard Viper V10 cost?
The estimated value of the Millyard Viper V10 is between 100,000 and 150,000 pounds (approximately 116,000 to 174,000 euros / 132,000 to 198,000 US dollars). This range is provided by the auction house and does not include buyer’s premium or VAT. The final price will only be determined at the auction on July 22, 2026.
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How much horsepower does the Viper V10 have?
The Viper V10 produces approximately 500 HP (368 kW). It also delivers 712 Nm (525 lb-ft) of torque. The power comes from an eight-liter V10 engine from a Dodge Viper.
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How fast is the Millyard Viper V10?
The machine reached approximately 333 km/h (207 mph) during a runway speed test. Together with Henry Cole, Millyard also set a tandem world record at approximately 295 km/h (183.5 mph). Originally, a top speed of approximately 402 km/h (250 mph) had been targeted.
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Who built the Viper V10?
The Viper V10 was built by Allen Millyard, a British engineer and custom-build specialist. He began the project with an engine acquired in 2004 and completed the motorcycle in 2009. It is the first of his creations that he is offering through an auction house himself.
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Where is the Viper V10 being auctioned?
The auction takes place on July 22, 2026, at the National Motorcycle Museum in Solihull and is conducted by H&H Classics. It starts at 10 AM local time. According to the auction house, bids can be placed in person, by phone, or online.
