Okay guys. First off, thanks for the advice, much appreciated. Sorry for not getting back sooner but I'm not satisfied with what seems to have solved the problem and I've been expecting it to reoccur. Being familiar with troubleshooting procedures, I started looking for the simple fix first and test each fix before moving on to the next. To make a short story short, I couldn't see the fluid level in the site glass on the master cylinder reservoir because the level was ABOVE the site glass. I removed the cap from the reservoir and the fluid level was about 1/4" from the top of the reservoir. Should be no problem but, I went ahead and added a few drops and brought the level to about 1/8" from the rim. This was enough fluid to cause it to run over when I put the diaphragm, cap and screws back in the reservoir. This bike does not have a top bleeder at the master cylinder, just a bleeder at the slave cylinder. I checked oils and looked for any leaks and everything seemed okay, so I thought I'd try that simple check before moving on. The next morning when I should've had the up-shift difficulty, it didn't happen. Every morning since, it's been fine. I do not have confidence in this "fix" and expect the problem back at any time. All I did was fill a reservoir that did not need fluid. I don't want to be an "alarmist" but I still think I'm going to change the fluid. Anyway, thanks.