2005 Bad Boy AOS with a Briggs & Stratton Vanguard 31. Engine smoked for about 10 seconds. They stopped, shut it down to check the oil. Everything looked fine. We noticed an idler pulley with a bearing out. Tried to start it to move it in the building and found out the engine seized. I couldn't believe it. Pulled the engine and disassembled. I had to get it all the way down to find the seizure. It was the bushing/bearing on the crankshaft magneto side. The crankshaft and crankcase look fine. The brass bushing is torn up a little and extremely tight on the crankshaft. It was dry and blue. The plastic teeth from the oil pump were missing and laying in the crankcase. Everything else in the engine still had oil and look good. I contemplated a new engine, but decided to fix it. About $350 in parts for all the gaskets, seals, oil pump, and the bushing/bearing. It is a brass bushing and is the most expensive part of the whole deal ($120) I'm waiting on parts. I'll post when it's running again.