Quote Originally Posted by gustavus View Post
Taking a sledge hammer to cast aluminum, it breaks like glass sending shards flying. Wear safety glasses if you do try to break it up.

I just googled the mark 5 looks to be from the 50's and would have collector value, now that you have damaged it save the coils, carburetor, flywheel, connecting rod, drive shaft and gear case from below. Essentially any part that comes free is good to sell.
I will check it out and see if anything is salvagable.