Journeyman
"And this one is just right" ~ Goldilocks
Yeah, sounds like something I might have tried trying to figure out what's going on, but as @Protonhound said- obviously not a good idea.
How many miles are on the bike? You said you might be hearing it from the drive shaft. Have you inspected and lubed the splines? I don't think most people do, but it's a necessary part of maintenance on every bike with a final drive, including the mighty Rockets. I predict over time we're going to hear about FDs going out on the 2.5s. I went through two on my '11 Roadster and that was with routine maintenance.
Lube the splines...
At a little over 8k miles I thought it time to lube the splines on the 3R. I'm one of the few who went through a final drive and drive shaft on the older models and have tried since then to do this with every rear tire change or, at least, every other, so every 4 -8,000 miles. Although there was...