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YZR500 was the Yamaha Motor Corporation’s entry for 500cc Grand Prix motorcycle racing between the years of 1973 and 2002.
Successes [ edit ]
Riders who rode it to world championships are
Giacomo Agostini ( 1975), Kenny Roberts ( 1978, 1979, 1980), Eddie Lawson ( 1984, 1986, 1988) and Wayne Rainey ( 1990, 1991, 1992).
Chronology [ edit ]
OW20: Liquid-cooled, inline-4, 2-stroke engine, chromoly frame. Yamaha’s first 500cc factory bike won from the outset at the first round of the 1973 season, ridden by Jarno Saarinen. 2nd
OW23: Yamaha’s first machine created specifically for 500cc racing. Yamaha won their first 500cc constructor’s championship with it and in 1975 Giacomo Agostini rode the revised OW26 to a world championship as well as giving Yamaha their second 500cc constructor’s championship. 1st
OW35: Changes were made to the valve intake system, stroke ratio and carburator. 2nd
OW35K: Introduction of Yamaha’s Power Valve System (YPVS). Kenny Roberts won his first of three championships with it.
OW48: Introduction of an aluminum frame to the YZR500. 2nd
OW48R: 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.
OW53: Same rear-directional exhaust as the OW48R, and the aluminum frame used a squared cross-section. Last inline-4 YZR500. 2nd
OW54: Square-4 engine, rotary disc valve.
OW61: The first V4 engine in a 500cc 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. [1 ]
OW70: Introduction of the aluminum Deltabox frame and designed specifically for a 17-inch front wheel (from 18 inches). 2nd
OW76: Crankcase reed valve system. Eddie Lawson wins the rider championship with it. 2nd
OW81: Re-designed V-4 engine. Eddie Lawson won the rider's championship with it. 2nd
OW86: Improvements to the exhaust and cooling systems. 1st
OW98: A new exhaust layout of both pipes going under the engine and out the right side required an asymmetrical swingarm. Eddie Lawson won the rider's championship on it. 1st
OWA8: Introduction of a data-recording device. 2nd
OWC1: Wayne Rainey won his first rider's championship on it. 1st
OWD3: New regulation came into effect: the minimum weight would be 131 kg (for the 4 cylinders bikes). Yamaha used in this year first (and last) chip controlled suspension (CES). 1st
OWE0: In the latter-half of the season, Yamaha introduced their own "big-bang" firing order to the YZR500. Third championship for Wayne Rainey. 2nd
OWF2: 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
OWF9: Re-design of the fairing and introduction of ram-air intake. 3rd
OWJ1: New alloy for the engine and new design for the frame. 2nd
OWH0: The "V" was widened to allow a larger air box. The OWJ1 and OWH0 were developed simultaneously and used in reverse order during the season. 2nd
OWK1: Move to unleaded fuel. 2nd
OWK6: General improvements to the engine, frame and cowl. 1st
OWL9: The 28th and last generation of the YZR500 had to compete against the newly allowed 4-stroke machines. 2nd
External links [ edit ]