Please go to the following web site for the information that you need...
Some of the issues that is site addresses are listed below the URL...
http://en.allexperts.com/q/Motorcycle-Repair-837/Clutch-adjustment-Honda-Shadow-1.htm
Clutch Operation Faulty:
Clutch slipping:
No clutch lever play
Friction plate worn or warped
Steel plate worn or warped
Clutch spring broken or weak
Clutch release mechanism trouble
Clutch hub or housing unevenly worn
Clutch inner cable catching
Clutch not disengaging properly:
Clutch lever play excessive
Clutch plate warped or too rough
Clutch spring compression uneven
Engine oil deteriorated
Engine oil viscosity too high
Engine oil level too high
Clutch housing frozen on drive shaft
Clutch release mechanism trouble
Clutch hub locknut loose