Hey! Just Joined. I've been talking to a guy who has an '05 900 RMK for sale. I havn't looked at this machine yet, but his asking price doesn't sound too bad. The main concern I have is he said there's cracks starting to appear in the crankcase. I suspect welding is out of the question (creating stresses, etc.), replacement would make more sense to me. But, what caused the cracks in the first place? From reading other posts, it sounds like the clutch &/or the crank need to be balanced. Have also read posts about crankcase to crank bearing clearances that are either too tight or too loose. He says it does vibrate, but not excessively. So it looks like a total engine teardown & rebuild would be required to make this unit reliable. But here's the deal: how much time & cash do I put into this engine when I could spent more on a unit which has proven reliability & not worry about it? Is the extra cash worth it (end up with a strong running, torquey engine)? Or, are there other engines that are a direct bolt-in? I guess it all boils down to how low he's willing to go. Any suggestions? Thanks.