This is a 917.273322 hydrostatic tractor. Came with a busted 26HP V-twin Kohler. By the clunking sound it makes when rocked I'd say it has a busted rod.. I'm going to run a Briggs Intek 33 single. To mount the briggs I removed the rear engine mount bracket and shortened an engine mounting plate from a YTS3000. It drops nicely onto the GT frame. This can be easily reversed to mount the Kohler. I have an old briggs on the plate to work out placement for correct belt length. With luck it will be up and running soon.