I picked up a 2006 TW 200 for $300. It was a basket case. I like projects and have done museum quality restorations in the past. My question is trying to find out if my engine is from this bike or something else. How do you determine it from the engine serial number? I can't find any info on it. The serial number is 3AW 109444. Now I got the bike assembled and went to fire it up. Cranked over and would barely pop at idle and nothing when throttle was opened. Checked the compression and it only had 55 lbs, so pulled it down and found the piston all scored and rings sort of welded to the piston on one side. The seller never had it disassembled but included one of those 70mm AHL piston kits so off to a machine shop to have the cylinder bored out!