Wow. I'm in total shock right now. I have a 2004 TTR 225 with a baja dual sport kit, Oregon plate. I'm the second owner and I'm sure bike has low miles and has been ridden very mildly and maintained well. Here's what just happened. The bike has been in the shop getting some great upgrades that include a smaller sprocket in the rear (for better top speed around town) and the new FMF Powercore. The local shop did all the work. I just got the bike back yesterday and I have to say the changes were awesome. Soother gears, more power and AWESOME sound. Here's what just happened about 1 hour ago. I've ridden about 8 miles since getting it back from the shop. All of a sudden the bike started to make this loud high pitch squeal that sounded something like a washing machine breaking or a loose belt on a car. Horrible sound. Off and on, then some licking sounds, some ticks and all kinds of horrible sounding stuff. Hard to imagine but the sounds were coming from THE MOTOR. I limped it back to the shop and they are looking at it in shock themselves. Mechanic said he was unsure but a possible rod? He wasn't sure if it was coming from the top end or bottom but was leaning toward the bottom end. The bike shifted fine and generally still had power although it did cut out abruptly a few times as that horrible squeal came on. Does anyone have a clue what just might have happened? Did my motor blow? Is it going to cost a grip to fix? I really like the bike and it's in mint condition other than this problem so yes I would like to fix it although I can't imagine spending over $1500 on it. My real question is HOW DID THIS HAPPEN. My fault or the shops? I normally just ride it in small town traffic although recently I took it on about a 90 mile road trip with a lot of 55mph hwy. Before the new smaller sprocket I had to run the motor pretty hard to keep it around 55. Could doing this for 50 miles have done it in? The mechanic who did the work is real experienced although I don't think he rejetted the carb, just adjusted when the new pipe went on? I'm not totally sure but that's what I think he said and they didn't charge me for any jetting stuff on the receipt. I felt like I was riding it normal although I was revving it harder than normal as I loved it's new sound with the pipe. Was I revving the thing to hard and blew it up? I'm clueless and would love a little suggestion or insight if ANYONE has any. Either way I should have answer from the shop soon. There going to try and diagnose and possibly fix it before the big weekend as I'm going to camp outside Washougal and dual sport in to see the AMA this weekend. Thanks.