I'd contact Brian Miller, http://gardentractorpullingtips.com/index.htm, as he does a lot of work on Kohlers and may have an extra laying around. There is also a Kohler engine group on yahoo where you might want to post and contact Joe (Joe's Outdoor Power) http://stores.ebay.com/Joes-Outdoor-Power_Gravely_W0QQcolZ4QQdirZ1QQftidZ2QQpZ3QQtZkm as he parts out a lot of engines.