An in-line 4 engine that by all accounts is tiny, significantly smaller than the R1 motor. This engine was one of the few that started life as a 900cc displacement engine, rather than 990. It was quickly bored and stroked to the formula capacity limit (in 2002) as it was evidently not making the horsepower. In 2003 the carburetors were replaced by fuel-injection, intended to smooth the power and boost torque. In 2004 it was given a Valentino Rossi throttle controller...
Not as polished in the output department as the Honda, but clearly capable of high horsepower the 2004 motor allowed Rossi to win an astonishing World Championship. 2005 may be a harder year with other teams getting better, but with Rossi in the seat, if the team holds direction, 2005 could be another banner year for Yamaha.
This years bike also spins the crank in the opposite direction to some previous versions. This seems to have been done to reduce inertia and allow the bike to be turned into corners more rapidly.
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