![]() Improvements included a redesigned gear change linkage and an increase in gear change shaft length. The 1999 R1 saw only minor changes, apart from paint and graphics. The Yamaha YZF-R6 was introduced in 1999 as the 600 cc version of the R1 super bike. The exhaust used Yamaha's Exhaust Ultimate Power Valve (EXUP) system, which controlled exhaust gas flow to maximize engine power production at all revs, resulting in a high-power and high-torque engine. The instrument panel was electronic, with a self diagnosis system and digital speed readout. The R1 was also equipped with a 41 mm KYB upside-down front fork and 300 mm semi-floating disc brakes. Four 40 mm Keihin CV carburetors fed fuel to the engine. The swingarm could be made longer without compromising the overall wheelbase, which was a short 1,385 mm (54.5 in). Compacting the engine made it much shorter, allowing the wheelbase to be shortened as well and the center of gravity to be optimized. This "stacked gearbox" was followed by other manufacturers. ![]() Yamaha launched the YZF-R1 in 1998 after redesigning the Genesis engine to create a more compact engine by raising the gearbox input shaft and allowing the gearbox output shaft to be placed beneath it. 1998–1999 A red and white version of the first Yamaha YZF-R1 model in 1998 The Yamaha YZF-R1, or simply R1, is a 998 cc (60.9 cu in) sports motorcycle made by Yamaha.
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