Editing V-twin engine (section)

===V angle===
Although any 'V angle' (the angle between the two banks of cylinders) between zero and 180 degrees is theoretically possible for a V-twin engine, in practice angles smaller than 40 degrees are rarely used. The most common V angle for a V-twin engine is 90 degrees, which can achieve a perfect [[Engine balance#Primary balance|primary balance]] (if the correct [[counterweight]] is used) like most [[Ducati]]s, most [[Moto Guzzi]]s, the [[Honda RC51]], [[Suzuki TL1000S]] and [[Suzuki TL1000R|TL1000R]].<ref name="Shaking">{{cite web|url=http://www.sense.net/~blaine/twin/twin.html|title=Shaking forces of twin engines|author=Vittore Cossalter|access-date=2010-07-25|archive-url=https://web.archive.org/web/20110724060837/http://www.sense.net/~blaine/twin/twin.html |archive-date=2011-07-24|url-status=live}}</ref><ref>{{cite web |title=The Physics of: Engine Cylinder-Bank Angles |url=https://www.caranddriver.com/features/a15126436/the-physics-of-engine-cylinder-bank-angles-feature/ |website=www.caranddriver.com |access-date=18 August 2019 |date=14 January 2011}}</ref> However, this arrangement results in an [[Firing order#Even and uneven firing order|uneven firing order]], with the second cylinder firing 270 degrees after the first cylinder, then a 450 degrees interval until the first cylinder fires again. 90 degree engines are sometimes called L-twin (like the "L" in [[Suzuki TL1000R|TL1000R]] or [[Suzuki TL1000S|TL1000S]]) rather than V-twin.

The alternating longer and shorter gaps between firings produce a characteristic V-twin alternating engine noise "phutphut phutphut phutphut phutphut".

When a V angle of less than 90 degrees is used, perfect primary balance can only be achieved if offset [[crankpin]]s are used. If not, [[balance shaft]]s are usually required to reduce the vibration.<ref name="Shaking"/> Vehicles which use engines with V angles of less than 90 degrees include:
* 20 degrees: 1889 [[Daimler Steel-wheel car]]<ref name="VVC13" />
* 42 degrees: 1916–1923 [[Indian Powerplus]], 1920–1949 [[Indian Scout (motorcycle)|Indian Scout]], 1922–1953 [[Indian Chief (motorcycle)|Indian Chief]]
* 45 degrees: 1909–present [[Harley-Davidson]] V-twin {{Verify source|date=November 2022}}, 1990–1997 [[Suzuki VX 800]], 1985-2005 [[Suzuki VS series]], 2001–present [[Suzuki Boulevard C50]], 1985–2007 [[Honda VT1100]]
* 48 degrees: 2005–2012 [[Yamaha MT-01]], 1999–present [[Yamaha XV1600A]]
* 50 degrees: 1919–1924 [[BSA Model E]], 1924–1936 [[Brough Superior SS100]], 1929–1940 [[Matchless Model X]], 1936–1955 [[Vincent Rapide]], all Victory Freedom engines
* 52 degrees: 1997–present [[Honda Shadow]], 1987–present [[Honda Transalp]], 1998–2013 [[Honda Deauville]], 2002–2008 [[Honda VTX Series|Honda VTX]], 2004–2010 [[Kawasaki Vulcan#2004–2010: Vulcan 2000 series|Kawasaki Vulcan 2000 series]]
* 54 degrees: 2008–present [[Suzuki Boulevard C109R]], 2006–present [[Suzuki Boulevard M109R]]
* 55 degrees: 1985–2006 [[Kawasaki Vulcan 750]], 2006–present [[Kawasaki Vulcan 900 Classic]]
* 60 degrees: 2001–2017 [[Harley-Davidson VRSC]], 2014–2021 [[Harley-Davidson Street]], 1998–2003 [[Aprilia RSV Mille]], 1988–present [[Yamaha XV250]], 2001–present [[Yamaha DragStar 250]], 2015–present [[Indian Scout (motorcycle)#2015 Scout|Indian Scout]]
* 70 degrees: 1982–1983 [[Yamaha XZ 550]], 1988–1998 [[Suzuki RGV250]], 1987–2004 [[Yamaha Virago 535]], 1997–present [[Yamaha DragStar 650]]
* 72 degrees: 1974–1989 [[Moto Morini#Moto Morini 350 & 500 V-twins|Moto Morini 350 & 500 V-twins]] Voxan 1997–2010
* 75 degrees: 2005–present [[Hyosung GT250]], 2008–2015 [[KTM 1190 RC8]], 1981–2007 [[Yamaha Virago]], 1998–2008 [[Yamaha DragStar 1100]]
* 80 degrees: 1978–1983 [[Honda CX series]], [[Rotax|Rotax 810/660/490]] engines

Vehicles which use engines with V angles of greater than 90 degrees include the 1934 [[Moto Guzzi]] 500cc (120 degrees)<ref>{{Cite web|title=Motorcycle Classics {{!}} Exciting and evocative articles and photographs of the most brilliant, unusual and popular motorcycles ever made!|url=https://www.motorcycleclassics.com/classic-italian-motorcycles/moto-guzzi-bicilindrica-history-zmcz13sozbea/|access-date=2021-06-07|website=motorcycleclassics.com|date=5 August 2013 |language=en-US}}</ref> and the 1940–1948 [[Zündapp KS 750]] (170 degrees).<ref>{{cite book |title=The Art of BMW: 85 Years of Motorcycling Excellence|first1= Peter |last1=Gantriis |first2=Henry |last2=Von Wartenberg |publisher=MotorBooks International |year=2008 |isbn=978-0-76033-315-0 |page=80|quote= The Zundapp (sic) was powered by an air-cooled 170-degree V-twin that was very similar in design that was very similar in design to the BMW boxer twins}}</ref>