hey guys, first of all I don't know not a damn thing about dirt bikes and I'm looking to buy a 2004 crf450 with a broken engine(which is the bottom piece of the block). To tell you truth I have no idea what this bike has, it has some stickers that say six12, pivot works, hotcam. The engine broke due to some idiot put transmission fluid into the oil port and turned it on for 3 minutes and cracked wide open. I want to know if this bike is worth fixing, and could I just get the bottom piece cause only the bottom cracked or do I have to get a new engine, any advice will help thanks guys !