I need some help listees,  My 85 GL Westy's clutch works fine when cold but after driving and warming up, the clutch really chatters in 1st gear.  Just replaced the slave cyl. and flushed and bled the hydraulics.  New clutch plate ( Sachs H/D ) and disc.  Flywheel was true and cleaned at rebuild.  Absolutely no leaks at weep hole.  Let it cool and its OK.  Got any ideas ?
TIA
Dave
78 Westy
85 Westy
93 EVMV 5 sp.