Through a systematic regime of innovation and testing, they sought to refine the M1's traditionally strong traits such as good braking and quick handling (which impressed Rossi), and marry them with good balance and transition to power. This was a shrewd move and was cited by Rossi in his autobiography as being instrumental in providing him with the strong basis necessary for launching an attack on the Championship with the YZR-M1.ĭuring 2003/2004 winter testing, Yamaha stepped up to the plate by pulling out all the stops in their collaboration with Rossi and Burgess. Meanwhile, Rossi wasn't the only defection Honda had to contend with Jeremy Burgess (crew chief for Rossi at Honda), along with the majority of his long-established crew, were convinced by Rossi to join him at Yamaha. A well-publicised increase in the pace of development of the Honda machine over the winter season fuelled expectation that a Honda RC211V in the hands of riders the calibre of Max Biaggi and Sete Gibernau would have no problem in retaining the World Title for Honda. It was widely felt not only by his critics and media pundits but also by many fans, that even he would not be able to bring the struggling YZR-M1 up to the level of the hereto all-conquering Honda RC211V. Valentino Rossi signed a two-year contract with Yamaha, reportedly worth in excess of US$6 million per season, in a move that was described by the press as "biting off more than he could chew". M1 riders were Checa, Alex Barros, Olivier Jacque, Marco Melandri, Shinya Nakano and Norifumi Abe, and there were no wins and Yamaha came in third in the manufacturers' championship. In 2003, the engine went from carburetion to fuel injection, and the engine brake control system was replaced with an Idle Control System that automatically adjusted the throttle valve opening on two of the four cylinders to improve stability and handling during deceleration.
Biaggi achieved two wins and placed second in the final standings as did Yamaha in the manufacturers' championship. It was raced in the 2002 season by Biaggi and Carlos Checa on the factory team, and towards the end of the season M1s were also provided to Norifumi Abe, Olivier Jacque and Shinya Nakano. The M1 was test-ridden and developed by Max Biaggi, John Kocinski, Norihiko Fujiwara and Kyoji Namba throughout 2001. The frame design also evolved during the season, with adjustment of the engine mounting position and change in the fuel tank shape.
MOTOGP 19 SMANUAL SETUP FULL
The new engine had 5 valves per cylinder, was fed by carburetors and began with a displacement of 942 cc in the second half of the season it progressed up to the full 990 cc regulation limit. The M1 was outfitted with an electronic engine management system that controlled the engine braking endemic to 4-strokes. Also, Yamaha wanted to preserve the superior handling of the YZR500, so the M1's engine was designed to fit in a chassis developed around the basic structure of the YZR500. In a change from their V-4 YZR500, Yamaha designed the YZR-M1 (for "Mission One") with an inline-4 engine because it was the format considered to have the best mutual balance with the frame. Since then, the YZR-M1 has been continuously developed into several iterations through the 990cc, 800cc and 1000cc eras of Grand Prix Motorcycle Racing.Ģ002 was the first season which allowed 990 cc 4-strokes to be raced alongside 500 cc 2-strokes. It succeeded the 500 cc (31 cu in) YZR500 by the 2002 season and was originally developed with a 990 cc (60 cu in) engine.
The Yamaha YZR-M1 is an inline-four motorcycle specifically developed by Yamaha Motor Company to race in the current MotoGP series. Yamaha 1,000 cc (61 cu in) I4, 16-valve, DOHC, four valves per cylinder, Crossplane crankshaft, naturally aspirated, Twin-spar aluminium deltabox frame, multi-adjustable steering geometry, wheelbase, ride height, with aluminium swingarmįully adjustable Öhlins inverted telescopic forksīraced aluminium swingarm with single Öhlins shock and rising-rate linkageġ,150 mm (45 in) measured from identical reference plane
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