So I recieve a call today from a good friend who purchased a used 2001 XR650R last night. The bike looked to be in really good condition, with about half tread left on the original front tire. It was the original owner's first bike, and it looked pretty good, especially at what he paid ($3100 in Cali.). So, this morning he's changing the oil and whatnot, and opens up the airbox. Out falls about 15 pells of dog food. Also, the air filter on the right side is folded back, exposing about two inches of the back fire screen that seems to have been exposed when riding, as it is pretty dirty. So, he doesn't know what to make of it, and calls me. Now he's freaking out, wondering why there is dog food in there and more importantly, if the engine was damaged due to dirt getting in through the backfire screen. I told him I would get on here and get all of your opinions on the subject, though I have an idea. Since it is on the right side, my guess is that while in storage, a small mouse came through the airbox vent on the top right, and started storing food away for the winter. This is also probably why the airfilter is folded away from that area, as the mouse would have to make a spot to move. Lastly, this may have been corroborated by a small (though somewhat insignificant) hairball that was also attached to the filter. As for rather the bike is damaged or not, the air filter looked very clean, but the backfire screen was pretty dirty. There was a fair amount of dirt in the airboot that he could wipe out with his finger. But my guess is, it was probably only ridden for 1-2 rides that way (judging by the air filter), so things are probably alright. Anyone have any other observations? He's telling me that he feels like he wants to sell it as he doesn't want to be around when it blows up. But he also wanted to get it dualsported, and must buy a used bike before the end of december, which is pretty much a dream at this point (at least for a price like what he got). Thanks for the time reading this, and for any responses. PS - The bike is still not uncorked, so it probably wasn't ridden hard.