Start by checking the cable and it's condition and adjustment.
Next take a look here.
http://www.hdtimeline.com/transmiss...justment_and_troubleshooting_of_clutches.html
After that you may want to open up the clutch ramp side of the trans to see if the 3 balls and the snap ring are in place . This is what you should see. The 3 balls are behind the ramp and the snap ring should be in the land to hold the ramp in place. Disregard the red arrow.
After that, you should get a manual and go over the clutch side of the transmission to see if everything looks right.
You may try a clutch adjustment to see what you get out of it.
Clutch Adjustment Technique By The Book
Ideally, you want the motorcycle to be on a lift or stand. The procedure can be done on the kickstand but, some primary fluid may leak out.
Back off the cable adjuster until the adjuster is fully collapsed.
Remove the derby cover and set aside.
Loosen the clutch adjuster lock nut two turns.
Turn the clutch adjuster in until it LIGHTLY seats against the clutch release bearing. Seated means that it is touching but not pushing against the release. At this time the clutch lever should have very little play.
Back the adjuster out 1/2 to 1 full turn from seated. Repeat this several times to get all the play out.
Lock the adjuster nut down while holding the adjuster from turning.
Work the clutch lever several times before adjusting the free play at the cable adjuster. Adjust the free play to 1/16" to 1/8" as measured at the pivot.
Work the clutch several times to make sure operation is smooth and no binding in any part of the travel.
Install the derby cover after topping off primary oil if needed.
Perform a test ride and adjust the free play as needed to get the engagement and release points correct.
If you cannot adjust the clutch free play with the cable adjuster, the cable may be stretched or frayed.
A worn or warped clutch pack will often feel as if the adjustment is bad because it tends to make the release and engagement jerky. If after adjusting the free play you still have clutch operation problems it may be time to take a look at the clutch.
