Millyard Viper V10
{{Short description|Custom motorcycle with a ten-cylinder engine}}
The Millyard Viper V10 is a one-off motorcycle capable of over {{convert|200|mph|abbr=on}}{{Cite web|url=https://www.motorcyclenews.com/news/2009/october/allen-millyard-v10-viper/|title=Allen Millyard's V10 Viper motorbike hits 207mph|website=www.motorcyclenews.com}} that was built by British engineer Allen Millyard. The motorcycle weighs {{convert|1200|lb|abbr=on}}, of which {{convert|700|lb|abbr=on}} is the 8-litre engine,{{Cite web|url=https://www.motorcyclespecs.co.za/model/Custom/millyard_viper_v10.htm|title=Millyard Viper V10|website=www.motorcyclespecs.co.za}} sourced from eBay, originally intended for a Dodge Viper, with the V10 cylinder configuration producing {{convert|500|bhp|abbr=on}} at 4,800rpm.{{Cite web|url=https://www.topgear.com/car-news/supercar/millyard-viper-v10-dodge-2009|title=Millyard Viper V10 - Dodge this - 2009|date=August 28, 2009|website=Top Gear}}
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 {{convert|250|mph|abbr=on}} with this bike. In early speed tests, it surpassed {{convert|200|mph|abbr=on}}.[https://ultimatemotorcycling.com/2010/04/18/2010_millyard_viper_v10_motorcycle_review/ Millyard Viper V10 | Motorcycle Review by Ron Lieback April 18, 2010] The bike has been clocked at a top speed of {{convert|207|mph|abbr=on}} at the Bruntingthorpe Proving Ground.{{cite web |url=https://www.telegraph.co.uk/cars/motorcycles/millyard-viper-v10-at-london-motorcycle-show///|last=Robbins |first=Alex|title=Video: The 207mph V10-powered bike gets 48mpg, is about to deafen London | publisher=The Telegraph|accessdate=September 22, 2016|date=February 10, 2016}}
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 {{convert|183.50|mph|abbr=on}}, 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 {{convert|9800|ft|abbr=on}} long runway at Elvington Airfield, North Yorkshire, England, on 25 May 2023.[https://www.guinnessworldrecords.com/world-records/101327-fastest-tandem-motorcycle Fastest speed on a tandem motorcycle] Guinness World Records. Retrieved 30 January 2024[https://www.henrycole.tv/post/cole-millyard-set-new-speed-record-2-up Cole & Millyard set new speed record 2-up] henrycole.tv, 24 August 2023. Retrieved 30 January 2024[https://www.motorcyclenews.com/news/2023/july/pillion-speed-world-record/ 'It's got to be done': Millyard and Cole set sights on 200mph pillion record after previous run recognised by Guinness] Motorcycle News, 24 August 2023. Retrieved 30 January 2024