I'm about 2 weeks into ownership of my first BMW, a '93 R-100GSPD. You can see pics and a day trip report here: http://advrider.com/forums/showthread.php?t=805255 For the past several days, I've been spending most of my free time carefully going over the bike, replacing fluids, cleaning and adjusting stuff, and getting to know all its parts. This is not a burden to me, but one of my favorite hobbies. I'm kind of glad to learn the Beemer lends itself well to tinkering. It seems pretty easy to work on, and it has enough pieces deserving of some TLC to keep me busy for a while. This morning on the agenda was valve adjustment. I took off the left valve cover and everything seemed A-OK. The exhaust was exactly .008", so I left it alone, but the intake required a tiny adjustment to bring it to .004. When I opened the right cover, I found a little pile of scrap metal inside. Back when I was working on helicopters (German ones, no less!), if we found a gearbox with debris like this in it, we said it was "making metal." :huh (The penny wasn't there. I added it.) I took a few pictures to show you, and then started investigating to find out where this junk came from. Since it sat right below the intake valve rocker shaft, I looked there first. Here's what's going on: Seems as though a bearing is coming apart, and at least one and a half of the needles are trapped in the slot of the shaft mounting block. On seeing this, the first thing I thought was, "Bingo! So that's the source of the metal pieces." About two seconds later, I thought, "Nuts! This looks like it's gonna be expensive." At this point, I ran out of time and had to get cleaned up and ready for work. This whole business of keeping a full time job is really cramping my style. So tomorrow morning I'll tear into it further to see just how much damage there is. I suspect I'll need to replace at least the bearings, rocker, and shaft. I've been reading up on how to properly shim it. I'll also drop the oil pan to see if any pieces made their way into there, and look closely at the oil filter. I've never ordered from A&S BMW, but I like their website, they seem to have a good selection of parts, and their prices are reasonable (a relative term when we're talking about BMWs). Does anyone have experience with them, good or bad? Any ideas on what might have caused this failure, or advice on how I should proceed? There's a reputable shop 40 minutes from my house. I could pull off the entire head, take it to them, and tell them to just make it right. But then I'd be paying for labor as well as parts, and besides, I find it more fun to fix stuff myself. What a way to be initiated into airheads, eh?