I too found the clutch fluid needs changing frequently. ATF seems to work fine. I find frequent fluid changes necessary on many bikes with hydaulic clutches, most of which use brake fluid.. I figure it's because there is very little fluid in the system to disipate moisture, or whatever; a fraction of the amount in brake systems. On removing the slave, the spacer guide hole was somewhat elongated (bike has 18K miles). It was obvious that before long it would wear to the point that the piston would cock, and cause clutch failure... The piston has a projection that fits over the push-rod end, and it's a very loose fit. In fact, it's loose enough that piston alinement is dependent on the plastic spacer hole; a poor design. So I made a bushing for the tip of the pushrod, which now fits snugly into the piston end. The piston can't cock now. I'll check it every few thousand miles, but I expect it to be fine now... Note that since the push rod is a snug fit in the piston, and does not move, there will be no friction or wear to consider. If anyone can see a pitfall with this solution, don't be shy!