Replacing the rear sprocket
Slacken the chain
Remove the exhaust silencers (Removing the silencer).
Remove the rear wheel (Removing the rear wheel).
Restrain wheel shaft against rotation.
Remove the circlip (1).
Using a suitable socket wrench, loosen nut (2).
Fully unscrew the nut (2) and remove the washer (3) and the flange (4) with the sprocket (5).
Collect spacer (6).
Using a mallet, tap the sprocket flange (4) with the cush drive damper (7) off the rear sprocket (5).