Came off a stop light this afternoon, about the time I got to the far side of the intersection (4 Lane w/ turn lanes) I was about to shift into 3rd, and all of a sudden there is the horrific banging and bumping.  First thought was "did I blow a tire?", so I'm heading for the shoulder and the nearest parking lot.  I get to the side, and realize the tires are OK, the engine is running, and while stationary, no banging.  I walk/drive in 1st into the parking lot, and I realize I'm getting a CLUNK every now and then as I move forward, so I'm thinking this is tire or drive related.

Shut down, get off, get the gear off(it's only about 175 degrees in Houston this week ) and start looking it over. 10 min of checking and I have it narrowed down to the drive assembly somewhere.  Another 20 min of laying on the hot concrete, inspect, get up and roll the bike forward a couple feet and repeat till I can inspect al the things I think I can see.

Now, I find the problem, and here is where the weird luck thing comes in:  Apparently, as I was going across the intersection, I (or a car next to me) kicked up a small rock that hit the belt and got pulled into the rear drive pulley, and lodged between two of the teeth.  Then, every time that part of the pulley came around, it CLUNKED.  Got out the Buck knife and pried it out, and shazamm, no more problem.

So, get it home, inspect the belt all the way around and can't see any damage, so...can't believe the luck;  the bad luck to have the pebble get stuck in there, but the good luck to be able to find and correct it.

And was it tensioned to the 90° method or by the gage?

Wait until the first time you get stuck on a chip sealed road, you get the sealant and the crushed rock chips and the flaggers get real upset when you stop after the work zone but still between the flaggers to clean the rocks out. One summer they did all the roads from our place to town the same week. What a mess, they got to de tar our PU as they forgot to post one road, understand the county paid to detail over 300 vehicles before they were finished. Max

I've had little rocks jam the rear tire momentarily:

http://suzukisavage.com/cgi-bin/YaBB.pl?num=1218766842/8#8

I've had a rock wedge on top of the drive pulley and jam in between the belt and the engine case. Got home and smelled the burnt rubber smell and couldn't for the life of me figure out where it was coming from. Checked the tires, wires and under the seat till I noticed the groove on the top of the drive belt. Had to bust to rock out of there with a hammer and screwdriver as the rock was wedged in good. The groove is about 1/8th of an inch deep but still kicking after several thousand miles. These belts have earned that tough reputation in my book!!