The Millyard Viper V10 is a one-off motorcycle capable of over 200 mph that was built by British engineer Allen Millyard. The motorcycle weighs 1200 lb, of which 700 lb is the 8-litre engine, sourced from ebay, originally intended for a Dodge Viper, with the V10 cylinder configuration producing 500 bhp at 4,800rpm. A front subframe mounted to the engine carries the steering and suspension, with the front forks being crafted using hydraulic ram components with springs by Hagon. A rear subframe carries suspension created by using two monoshock units from the Yamaha R1 model. Millyard has stated that he aims to reach a top speed of 250 mph with this bike. In early speed tests, it surpassed 200 mph. The bike has been clocked at a top speed of 207 mph at the Bruntingthorpe Proving Ground. On 25 May 2023, rider Allen Millyard together with passenger, television presenter Henry Cole, claimed a world motorcycle speed-record, ratified by Guinness World Records at 183.50 mph, achieved with the pair riding "tandem" on the hand-made, road-legal machine, beating by two mph the previous record held by an American couple for over 10 years. The record was set using the 9800 ft long runway at Elvington Airfield, North Yorkshire, England, on 25 May 2023.