98+ Katana - Changing the counter sprocket.
tools required:
Allen Keys (4,5 & 6mm)
10mm,12mm wrench
1 1/4 " socket
17mm & 22 mm  wrench/socket for axle bolts
torque wrench		 This is my procedure - i will in no way be responsible for any errors.
please consult the owners & service manual.
 
 

Place bike on center stand & in neutral..

Start by removing the lower cowling & removing the left side fairing bolts,
( by the clutch cover, under the seat & up by the gas tank ) this will allow
you to pull the upper fairing far enough away the get to all the sprocket
cover bolts.
Mark the shifter position on the shaft and remove the bolt and ring clip.
( grease the shaft when installing )
Remove the 6 sprocket cover bolts ( there are three lengths of bolts -
3 long that run along the middle, 2 short lower bolts & middle length
bolt is the top one ). Remove the single bolt that holds the speed sensor.

The cover can now be pulled forward and lifted out of the way. Leave
the clutch cable attached.

 
Remove the speed sensor rotor allen bolt and remove rotor.
place a 2x2 or broom handle ( i used an axe handle ) through the rear
wheel and rest it on the swing arm. Remove the bolt - you may find
that a cheater pipe will assist in breaking the bolt free.
lefty loosy - righty tighty still applies.

Loosen the rear axle bolt and spin the adjusting nuts out to push the rear
tire forward. Once the chain is loose enough - remove the sprocket & replace.

Reverse the process.
torque as follows:
sprocket nut = 83 lb-ft (with thread lock)
speed sensor rotor bolt = 9.5 lb-ft
Rear axle bolt = 47 lb-ft