Bad sound from transmission, now louder whining
New to this site and just picked up a used '06 kingpin w/ 21k miles. Guy had 3 other bikes, retired cop and took great care of bike (has tons of extras). Anyway, so here is the problem:
Last night was out for ride w the wife and we stopped for dinner, upon leaving the bike started fine, kicked it into gear with the typical clunk, but as I let out the clutch and started moving it sounded like I was running over empty pop cans. It only did it that one time and was fine rest of the way home. No slipping, solid shifts.... When we had 100+ degree weather I noticed it was somewhat tough to shift but not impossible. Had the local Victory mechanic ride it and he said it was fine. (this was a couple weeks ago). Now the whining noise has gotten louder when decelerating. Could the transmission be going out? Clutch plates? I just changed the oil a few hundred miles ago with victory oil and filter. Ideas?