I hope this is the right spot in the forum for this. I am thinking of buying a bottom end from a guy on craigslist, and then rebuilding it for a DRZ 400 project. He doesn't have much info on it. The engine number is K419 - 140185. I've been searching for a while now and found that the K419 is a 389cc four stroke. I just have no idea how to tell what year the engine is. If anyone can help out that would be great.