The '''[[Yamaha]] YZF-R1''' was a in-line four, [[four-stroke]] Sport Bike [[motorcycle]] produced by [[Yamaha]] between 1999 and 2019. It could reach a top speed of 168 mph (270 km/h). Max [[torque]] was 82.91 ft/lbs (112.4 Nm) @ 11500 RPM. Claimed [[horsepower]] was 195.79 HP (146.0 KW) @ 13500 RPM.
[[Image:Yamaha YZF R1 2001.jpg|thumb|right|Yamaha YZF-R1 2001]]
The '''Yamaha YZF-R1''' [[motorcycle]], first built in 1998, helped initiate the litre class "handling arms race" between the Japanese [[Big Four]] motorcycle manufacturers ([[Honda]], [[Kawasaki]], [[Suzuki]] and [[Yamaha]]). When it was first introduced it was considered a groundbreaking design; a 1000 cc engine in a frame the size of a 600 cc bike. It was on par with the power output ratings of its competition but it was unique with its unprecedented agility.
The key in the R1's success was the redesigned [[Yamaha Genesis engine|Genesis engine]]. In traditional [[inline-4]] motorcycle engines the crankshaft, gearbox input and output shafts were parallel in a flat plane; in the R1 the shafts formed a triangle. This made the engine very short, allowing the [[Wheel_base|Wheelbase]] to be shortened greatly, which in turn led to the exceptional handling. This bike has a [[compression ratio]] of 12.4:1.The Yamaha R1 has a transmission of 6-speed w/multi-plate clutch.
The R1 was dominant for five years before the competition could catch up to its level. In 2003 the [[Suzuki GSX-R 1000]] and in 2004 the [[Kawasaki ZX-10R]] have successfully challenged the R1. The 2004 R1 produces 180 hp at the crankshaft and also weighs the same in kilograms, giving it a theoretical 1:1 power-to-weight ratio, however the horsepower that is released at the rear wheel is closer to 150hp (or more, under properly tuned and optimal conditions). The R1 is able to do 107 mph in first gear. In 2006 the Yamaha R1 expanded its output to 175 hp in addition to a 20 mm longer swingarm. The 2006 model year for the R1 is groundbreaking with the release of the Limited Edition model. At the [[MSRP]] of $18,000 and only 500 units made for the United States makes ownership very limited, marking the 50th Anniversay year for Yamaha.