I was riding on Friday 13th and had a couple of times when accelerating quickly that the RPMs rose but the speedometer didn't. It was raining the entire time that this happened. I backed off the throttle a little and normal forward propulsion was established again. The bike has over 150k on the speedometer. This kind of came on all the sudden although when accelerating briskly through the gears it is possible to get a pulse coming back through the clutch lever. When I got off the bike some multpurpose lubricant was sprayed into the area of the clutch lever just in case there was some "junk" that was preventing the master cylinder push rod and/or clutch lever from releasing fully. What are your thoughts? Time to renew the clutch? Star spring trouble? Time to rebuild the clutch master cylinder?