I have tore down my 650 as far as it'll go, and the crankcase STILL won't budge. Every exposed bolt is taken out, and looked over multiple times. No way I'm forgetting a bolt. I've taken a rubber mallet and a gasket scraper to a meaty edge to it and got a good portion cracked loose, but somewhere around the clutch packs and the crankshaft it's sealed tight, wouldn't budge AT ALL. Am I missing something? Please help!