Yamaha R1 Yzf

Yamaha launched the YZF-R1 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. This design feature was revolutionary, called a 'stacked gearbox', it has set a precedent for other manufacturers to follow. This "compacting" of the engine made the total engine length much shorter overall, thereby, allowing the wheelbase of the motorcycle to be shortened significantly. This, in turn, allowed the frame design to place the weight of the engine in the frame to aid handling because of an optimized center of gravity. The swingarm was able to be made longer without compromising the overall wheelbase, which was a short 1385mm. Four Kehin CV carburetors of 40mm diameter fed fuel to the engine, 140 bhp was claimed by the factory, at the countershaft. USD 41mm front forks supplied by KYB mounted 300mm semi-floating disk brakes. The instrument panel was electrical with, self diagnosis system inbuilt, and digital speed readout. The exhaust system utilised an EXUP valve, which controlled the exhaust gas flow, to maximise engine power production at all revs, creating a high powered but also torquey engine. The twin headlights were powerful. The Yamaha YZF-R6 was introduced in 1999 as the 600 cc version of the R1 super bike.
The 1999 R1 saw only minor changes, apart from paint and graphics. More improvements were a redesigned gear change linkage and the gear change shaft length being increased. Fuel tank reserve capacity was reduced from 5.5 to 4.0 litres 1.2 to 0.9 imp gal or 1.5 to 1.1 US gal while the total fuel tank capacity was unchanged at 4.0 imp gal; 4.8 US gal
Motorcycle Consumer News tests of the 1998 model year YZF-R1 yielded a 0 to 60 mph 0 to 97 km/h time of 2.96 seconds and 0 to 100 mph 0 to 161 km/h of 5.93 seconds, a 1⁄4-mile 400 m time of 10.19 seconds at 131.40 mph 211.47 km/h and a top speed of 168 mph 270 km/h with deceleration from 60 to 0 mph 97 to 0 km/h of 113.9 ft 34.7 m For the 1999 model year, Cycle World tests found a 0 to 60 mph time of 3.0 seconds, 1⁄4-mile time of 10.31 seconds at 139.55 mph 224.58 km/h and a top speed of 170 mph 270 km/h