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((refimprove|date=October 2010))
((Infobox Motorcycle
| name = Yamaha YZR500
| image = File:1975 Yamaha YZR500 (OW23).JPG
| caption = 1975 Yamaha YZR500 (OW23)
| aka =
| manufacturer = [[Yamaha Motor Company]]
| production = 1973–2002
| predecessor = [[Yamaha YZ634A]]
| successor = [[Yamaha YZR-M1]]
| parent_company = 
| class = 
| platform = 
| engine = [[two-stroke engine|two-stroke]]<br>'''OW23''':  ((cvt|494.7|cc)) [[Inline-four engine|inline-4]]<br>'''OW54''':  ((cvt|498.5|cc)) [[U engine]]<br>'''OW61''':  ((cvt|498.5|cc)) 60°  [[V4 engine|V4]]<br>'''OWK1''':  ((cvt|494.7|cc)) 70° [[V4 engine|V4]]
|bore_stroke      = ((convert|54|×|54|mm|abbr=on))<br>((convert|56|×|50.6|mm|abbr=on))
|power            = '''OW23''':  ((Convert|66.2|kW|abbr=on)) @ 10,500&nbsp;rpm
| transmission =
| rake =
| trail =
| wheelbase =
| length = 
| width = 
| seat_height =
| dry_weight =
| wet_weight = 
| fuel_economy =
| fuel_capacity =
| related = [[Yamaha TZ750]]
| similar = [[Suzuki RGV500]]<br>[[Honda NSR500]]
))
The '''Yamaha YZR500''' was a 500((nbsp))cc [[Grand Prix motorcycle racing|Grand Prix]] [[racing motorcycle]] made by [[Yamaha Motor Corporation|Yamaha]] from 1973 through 2002. ((-))
[[File:Wr12.jpg|thumb|the 1989 version of bike ridden by American [[Wayne Rainey]]]]

==Racing history==

The YZR500 was ridden by championship winners [[Giacomo Agostini]] ([[1975 Grand Prix motorcycle racing season|1975]]), [[Kenny Roberts]] ([[1978 Grand Prix motorcycle racing season|1978]], [[1979 Grand Prix motorcycle racing season|1979]], [[1980 Grand Prix motorcycle racing season|1980]]), [[Eddie Lawson]] ([[1984 Grand Prix motorcycle racing season|1984]], [[1986 Grand Prix motorcycle racing season|1986]], [[1988 Grand Prix motorcycle racing season|1988]]) and [[Wayne Rainey]] ([[1990 Grand Prix motorcycle racing season|1990]], [[1991 Grand Prix motorcycle racing season|1991]], [[1992 Grand Prix motorcycle racing season|1992]]).

[[Phillip McCallen]] won the [[Macau Grand Prix]] in 1996.

==Chronology==
{| class="wikitable" style="font-size: 95%;"
|-
! Year
! Model
! [[List of Grand Prix motorcycle racing World Champions#By manufacturer|Constructors'<br>championship]]
|-
! [[1973 Grand Prix motorcycle racing season|1973]]
| '''0W20''': Liquid-cooled, [[inline-4]], [[two-stroke engine]], [[chromoly]] frame. Yamaha’s first 500cc factory bike won from the outset at the first round of the [[1973 Grand Prix motorcycle racing season|1973 season]], ridden by [[Jarno Saarinen]].
| 2nd
|-
! [[1974 Grand Prix motorcycle racing season|1974]]
| rowspan=2 | '''0W23''': Yamaha’s first machine created specifically for 500cc racing. Yamaha won their first 500cc constructors' championship with it and in 1975 [[Giacomo Agostini]] rode the '''0W23''' to a world championship as well as giving Yamaha their second 500cc constructors' championship. 
| 1st
|-
! [[1975 Grand Prix motorcycle racing season|1975]]
| 1st
|-
! [[1976 Grand Prix motorcycle racing season|1976]]
| For 1976 as the factory Yamaha team was dismantled, the 0w23 was handed to Venemotos for Johnny Cecotto, but Cecotto soon discarded the 500 because it was obsolete compared to the factory Suzuki and even to the RG Mk1 production racers.
| 2nd
|-
! rowspan=2 | [[1977 Grand Prix motorcycle racing season|1977]]
| '''0W35''': Changes were made to the valve intake system, [[stroke ratio]], and [[carburetor]].
| rowspan=2 | 2nd
|-
| rowspan=2 | '''0W35K''': Introduction of Yamaha’s Power Valve System (YPVS). [[Kenny Roberts]] won his first of three championships with it.
|-
! [[1978 Grand Prix motorcycle racing season|1978]]
| 2nd
|-
! [[1979 Grand Prix motorcycle racing season|1979]]
| '''0W45'''
| 2nd
|-
! rowspan=2 | [[1980 Grand Prix motorcycle racing season|1980]]
| '''0W48''': Introduction of an aluminum frame to the YZR500.
| rowspan=2 | 2nd
|-
| '''0W48R''': At round 4 of the season, the YZR500 returned to a steel frame, and the engine had the outer cylinders reversed and thus rear-directional exhaust.
|-
! rowspan=2 | [[1981 Grand Prix motorcycle racing season|1981]]
| '''0W53''': Same rear-directional exhaust as the '''0W48R''', and the aluminum frame used a squared cross-section. Last [[inline-4]] YZR500.
| rowspan=2 | 2nd
|-
| '''0W54''': Square-4 engine, rotary disc valve.
|-
! rowspan=2 | [[1982 Grand Prix motorcycle racing season|1982]]
| '''0W60''' Updated square-4 machine
| rowspan=2 | 2nd
|-
| '''0W61''': The first Japanese [[V4 engine]] in a 500cc [[List of Grand Prix motorcycles|Grand Prix motorcycle]]. Also had a new frame structure that was the basis for the Deltabox frame, which was developed by Spanish engineer [[Antonio Cobas]].<ref>Adams, Dean. [http://www.superbikeplanet.com/2004/Apr/040414z.htm ''Antonio Cobas Dead at 52''] ((webarchive|url=https://web.archive.org/web/20100830155759/http://www.superbikeplanet.com/2004/Apr/040414z.htm |date=2010-08-30 )) Superbikeplanet.com 2004.</ref>
|-
! [[1983 Grand Prix motorcycle racing season|1983]]
| '''0W70''': Introduction of the aluminum Deltabox frame and designed specifically for a 17-inch front wheel (from 18&nbsp;inches).
| 2nd
|-
! [[1984 Grand Prix motorcycle racing season|1984]]
| '''0W76''': Crankcase [[reed valve]] system. [[Eddie Lawson]] wins the rider championship with it.
| 2nd
|-
! [[1985 Grand Prix motorcycle racing season|1985]]
| rowspan=2 | '''0W81''': Re-designed V-4 engine. [[Eddie Lawson]] won the riders' championship with it.
| 2nd
|-
! [[1986 Grand Prix motorcycle racing season|1986]]
| 1st
|-
! [[1987 Grand Prix motorcycle racing season|1987]]
| '''0W86''': Improvements to the exhaust and cooling systems.
| 1st
|-
! [[1988 Grand Prix motorcycle racing season|1988]]
| '''0W98''': A new exhaust layout of both pipes going under the engine and out the right side required an asymmetrical swingarm. [[Eddie Lawson]] won the riders' championship on it.
| 1st
|-
! [[1989 Grand Prix motorcycle racing season|1989]]
| '''0WA8''': Introduction of a data-recording device.
| 2nd
|-
! [[1990 Grand Prix motorcycle racing season|1990]]
| '''0WC1''': [[Wayne Rainey]] won his first riders' championship on it.
| 1st
|-
! [[1991 Grand Prix motorcycle racing season|1991]]
| '''0WD3''': New regulation came into effect: the minimum weight would be 131 kg (for the four cylinders bikes). Yamaha used in this year first (and last) chip controlled suspension (CES).
| 1st
|-
! [[1992 Grand Prix motorcycle racing season|1992]]
| '''0WE0''': In the latter half of the season, Yamaha introduced their own [[Big-bang_firing_order|"big-bang" firing order]] to the YZR500. Third championship for [[Wayne Rainey]].
| 2nd
|-
! [[1993 Grand Prix motorcycle racing season|1993]]
| '''0WF2''': An extruded aluminum frame was designed to resist flex from increased power output, though [[Wayne Rainey]] complains that it is too stiff, and in round 8 Rainey switches to a chassis used by Team ROC.
| 1st
|-
! [[1994 Grand Prix motorcycle racing season|1994]]
| rowspan=2 | '''0WF9''': Re-design of the fairing and introduction of [[ram-air intake]].
| 3rd
|-
! [[1995 Grand Prix motorcycle racing season|1995]]
| 3rd
|-
! [[1996 Grand Prix motorcycle racing season|1996]]
| '''0WJ1''': New alloy for the engine and new design for the frame.
| 2nd
|-
! [[1997 Grand Prix motorcycle racing season|1997]]
| '''0WH0''': The "V" was widened to allow a larger air box. The 0WJ1 and 0WH0 were developed simultaneously and used in reverse order during the season.
| 2nd
|-
! [[1998 Grand Prix motorcycle racing season|1998]]
| rowspan=2 | '''0WK1''': Move to unleaded fuel.
| 2nd
|-
! [[1999 Grand Prix motorcycle racing season|1999]]
| 2nd
|-
! [[2000 Grand Prix motorcycle racing season|2000]]
| '''0WK6''': General improvements to the engine, frame and cowl.
| 1st
|-
! [[2001 Grand Prix motorcycle racing season|2001]]
| '''0WL6'''
| 2nd
|-
! [[2002 Grand Prix motorcycle racing season|2002]]
| '''0WL9''': The 28th and last generation of the YZR500 had to compete against the newly allowed 990cc [[4-stroke]] machines.
| 2nd<ref>All but 10 points that counted towards the Constructors' championship were scored by Yamaha's [[YZR-M1]] [[4-stroke]] machine</ref>
|-
|}

==See also== 

*[[Honda NSR500]]
*[[Suzuki RGV500]]
*[[Kawasaki KR500]]
*[[MV Agusta 500 Four]]
*[[Honda RC181]]
*[[Honda RC174]]

==Notes==
((Reflist|1))

==External links==
*[http://global.yamaha-motor.com/jp/race/wgp-50th/race_archive/machines/ Official Yamaha page for the history of the YZR500] ((in lang|ja))
((Grand Prix motorcycles))
((Yamaha motorcycles))
((Yamaha motorcycles timeline))

[[Category:Yamaha motorcycles]]
[[Category:Grand Prix motorcycles]]
[[Category:Motorcycles introduced in 1973]]
[[Category:Two-stroke motorcycles]]

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