Hi David...
Maybe a real mechanic will joing in here,,,, but those bikes that have had the clutch "ridden" instead of Neutral.. the spring fingers in the clutch engagement spring ( 4" diamter conical toothed washer-like spring ) become overheated, loose some of the temper as well as the spring height ( conical height should be between 4.4 and 4.7 mm ) . This can lead to partial clutch engagement ( grinding ), damage to the primary spline and steel clutch plates and of course premature clutch failure.
The "fibre gear" is critical also... this is the Oil Pump input gear.
Look at the Service manual to locate the assembly and the parts I am refering to.
Hope that explains what I meant...
best regards...
Ernie in NH