Never having worked on the GSXR400...
Have a look at the bottom where the cable enters the motor. There is often an adjustment there onto the clutch pushrod. Have you lubed the cable?
To replace the clutch, put beer in fridge. drain the oil. Undo RHS engine cover. This is a good chance to replace the bolts if needed - old Yams in particular were famous for having engine bolts made from vintage cheddar - an impact driver can help. With RDs, whcih use philips round head screws, if you chew out the head, carefully drill the head off. the remainder unscrews with your fingers once you have removed the sidecover
You will see the clutch basket and it usually has 6 or so screws which you can see holding the plates together on the inner. Undo screws - they have springs behind them. Remove clutch plates, noting quantity and order of fibres and steels, and which one is first. The plate nearest the engine is sometimes a special one. Measure thickness of plates and check the steels are flat and not blued.
Use a new gasket or Hermatite when putting the sidecover back on. Don't forget the oil. Open beer.
Should take an hour to do tops.
Geoff
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