Ehh fellas. My chain had snapped on my 2009 YZ450f and damaged some of the crank case in front of the front sprocket. What a piss off, she's dickered ! Instead of patching it up Mickey Mouse style I finger I should just buy a new left-half of the crank case. I am not having much luck finding a used one, as a brand new one is a little out of my price range, I would have to cut a hell of a lot of grass to pay it off. I was on Ebay and stumbled across a 2003 YZ450F left half crank case and wondered would it fit my bike? It's half the price of a brand new one. Just wanted to see what you trouts have to say. Thanks bi's !