I was ridding my 2003 yamaha warrior 350 and the chain came off. When this happened the chain snapped off a piece of the engine and oil was pooring out all over. Where can I get a new engine? please dont tell me that I should have greased the chain, its too late so if your not going to be helpful dont respond.

 

Since you only need the half that is broken, See what the cost is from Yamaha, just for that half.

If no joy from Yamaha, then maybe do some searching on ebay for a a set of crankcase halves...... making sure to get good casings can be fun.