I checked the primary chain before leaving work and there was only about 1/4" play at the top run of the chain. I got it home but it was not a happy ride. The motor seems fine, the clutch seems to work fine, the gearbox seemed to shift fine but I could not accelerate at all. The bike would "lurch" and make unhappy growling noises in all gears.
I babied it home and pulled the primary, clean as a whistle, no obvious problems present.
No shavings, no bits, the fluid is clean and clear as the day I put it in.
I peered into the gearbox through the inspection plate and don't see any carnage there. I spun the back tire in several gears while looking into the gearbox and there are no bad noises, no visibly broken gear teeth or anything.
I looked at the primary sprocket and it looks good.
I'm hoping to get time to delve into it more later but it will most likely be a day or two. The one thing I did notice is that there is way too much slack in the rear chain. Almost 4 inches of travel on the center stand. I know I checked the chain not even two weeks ago when I changed the oil and it was only about 1 1/2" then.
I will try and adjust the chain and see if that fixes the problem.