V65 Clutch problem

Air in the line was my first thought. I have never liked the idea of a hydralic cluch. I don't think its warped cluch plated. if the plates were warped you would have a cluch that doesn't engage smoothly! It would " chatter" a lot. Not to mention that you would feel it in the cluch. The cluch does have springs that press the pressure plate to the fly wheel. I have never heard or scene them fatigue but thats highly possible. The first thing I would try would be to change the fluid in the reservior with new fluid and bleed the system. That is a relatively cheap try. if that doesn't work I would then change the springs and clutches.

James,
Thanks for your response. I believe it most likely is air in the line, but its the length of time it takes to show up that has me stumped. Would a small amount of air take 4 or 5 hours to accumulate into a big enough bubble to cause this problem, as opposed to a larger amount that would have a more immediate effect on the clutch? And could the bubble dissipate once the bike sat unused, so that the problem isn't apparent until after prolonged use?

I think more than air, its water! It would take a while for it to work down to the slave cylinder where it matters the most.