There's a link to a tutorial to make your very own Evil Dead chainsaw posted on the Horror Bid blog.
Not the most accurate prop, but it's CHEAP and would look great with your Ash costume. Check it out!
href="http://www.horrorbid.com/blog/blog1.php/2009/02/26/make-your-own-evil-dead-chainsaw">http://www.horrorbid.com/blog/blog1.php ... d-chainsaw