Soo... I got an 05 SM for $2500. It had 15,xxx on the odo but it ran great when I bought it and looked to have been well taken care of (oil change reciepts, service history etc.) The owner had multiple bikes both Japanese and exotics and seems to have extensive knowledge about bikes. Anyways, rode fine for 200 miles now it starting to knock on me. It started as an almost "bad bearing" type sound, (it was constant, and the faster I went the worse it got) Now, about half a tank later the light "tick" or valve tap I had at idle (which I was told was normal) has now started to resemble a knock. I am just hoping it is not coming from the bottom end, and that I am not another victim of buying a shitty, beat-up abused run through DR-Z. I have not done anything to the bike since I got it other than change the oil and flush the coolant. I will start the tear down in the morning. I will check valve clearances asap but I was wondering what else you guys think I should check while I'm in there? Thanks any input greatly appreciated. Is there a way to check and make sure the ACCT is working correctly??