I bought my R65 a few weeks ago and after her long hibernation(16 yrs) I got her up and running, I've done about 60-70 miles and I can't believe how well she goes! Now I'm not new to bikes, I've had lots and lots, I thought these smaller Beemers were supposed to be under powered! After my last ride I checked the engine number to see if it was a 750 or 800, I soon found a website to cross reference the R series numbers only to discover she's got a 450 motor, well bottom end, I can only assume there's been a bottom end failure at sometime, curiously both engine and frame number are from the same year and month.