Dune trip last weekend going up test hill by the vender's in second gear when all of the sudden it pops out of 2nd gear from half throttle I look down while stopped to find engine oil leaking into the sand from under my shifter/shift shaft http://oem.thumpertalk.com/2004YZ450Fshiftshaft.aspx***! Long story short, chain or master link broke or came off and my chain wrapped around the shift lever and bent it back and down causing the case just behind the shifter to split/crack causing about a 1/4 inch by 1/4 or so inch opening. The chain managed to wedge itself twice over into the chain guide by the swing arm and bent that too including the case saver. It feels like it can be shifted into neutral but it's tough to tell with no chain on. I just washed the bike tonite and plan on removing the skid plate tomorrow to re evaluate the damage. At what point does one determine that a new case (hopefully that's it) is in order? If the crack is weldable should I try it or will it need to be opened to weld it? Hopefully the gearing and gut's are ok but it looks questionable with the shift shaft bent the way it is. I wonder if it's possible to bend the shift shaft and crack the case where it enters the case without damaging the internal parts? What would you guy's do next (other than saving $).