Hey, how's you mule coming along? I'm about finished with mine and will be posting some pics soon. I wanted to let you know I put a TAV unit on it and am not real keen on it. I'll be removing it at some time and going with a drive and driven unit. The problem with the tecumseh sport engine is getting it close enough center to center on the pulleys to find a proper belt. My other mule does not have the correct belt (it's too wide) but I've made due by adding a shim to the drive pulley. Anyways, I wanted to let you know that whatever engine you go with, make sure you can get the proper distance on the pulleys.