The current fastest production motorcycle is the ZX-14. The Kawasaki motorcycle, has been documented officially (with standardized pro-grade speed measuring equipment) to have broken 200 mph and beyond in multiple instances, both by professional riders and amateurs running a speed course.
The previous record holder was the Hayabusa at around ~195 mph maximum, with most record attempts achieving 185-190 mph.
The closest contender to the previous Hayabusa was also a Kawasaki. The ZX-12r. While the 12r did have 5 more hp more than the Hayabusa, its aerodynamics were not as efficient as the Hayabusa's, which translated to slightly slower top speeds.
The Vincent Black Shadow was the fastest production street motorcycle from 1949 to 1972
smegms.
1150 suzuki
The fastest production four-stroke single cylinder motorcycle is most likely the 2011 Honda CBR250R.
The fastest production motorcycle in 1985, backed up by the G. book of world records, was the 1985 Honda v65 Sabre.(1100 cc's)
yamaha VMAX 1200cc
BMW has the fastest production bike with their S1000RR. It has a top speed of 188 mph off the showroom floor.
Suzuki Hayabusa GSX1300R is the world's fastest production motorcycle.
A CBR1100XX SUPER Blackbird
Bmws1000r
1992 Suzuki Katana 1100 (gsx_1100f)
Since late 2010, the Ack Attack team has held the motorcycle land speed record at 376.36 mph (605.69 km/h). The fastest production motorcycle is the MV Augusta F4 R 312 with a top speed of 193.24 mph (310.99 km/h)