Clutch on L100 sucks!

Just wondering how many others have had problems with their clutch. I have been living with mine for two years, very expensive repair. Summer it is fine, but when the temp. drops, it seems to suck air and next thing you know, you have no clutch. As long as I keep it at a certain speed, I can pump it up to engage (left leg is now bigger than my right!), but if I push it, I have to bleed the clutch of air, sometimes on a busy highway. It is not leaking, but sucking in air. Has anybody else had this problem, and what did they do to help it, other than replacing entire clutch system.