I have a broken crank case on my 03 kfx400. I'm an ok mechanic on two stroke but a big dodo when it comes to the four strokes. I am looking for a good place to locate a used crank case as a new one is 450$. Also I need to find detailed schematics or a book to hold my hand as I try and fix this on my own. The quotes I'm getting from shops is $500 or more for laboe alone. I just don't have it. Any help would be great.