Reading this thread and especially about one poster who packed the entire case with wheel bearing grease and has no problems with clutch slipping for 250 miles brings up a thought:
I wrote this post some time ago but was a bit intimidated to post it because of it's possibly controversial content:
I'm sooooooo tempted to run the gears in a small bath of 90 WT oil on my china girl to cut down on gear noise and extend gear life. And it should be easy. Sealing the cover would not be a problem. The gray sealer they use to seal "real" motorcycle cases should do the trick. A small filler hole on top would be equally easy. Just drop in some 90 WT and keep those gears wet.....but then there's the clutch of course. And from what we think now this needs to be dry. Running the clutch in the presence of 90 WT will either cause it to slip, or possibly burn the oil and become so "grabby" that it will hardly function as a clutch anymore.
Anyone who's driven a stick shift with a leaking rear main seal and an oil contaminated clutch will know what this is like.
So my question is has anyone ever had a clutch failure due to oil contamination. What are the chances these clutches could actually be run wet? If clutch failure would not occur the benefits would be HUGE.
The gears on my China Girl were noisy, REAL noisy. I removed the clutch cover and found the same thing reported by others. Wheel bearing grease, lots, on the gears really helped but just for a short while. I don't think ANY type of grease is a permanent solution. It fly's off, never to return.