Bobcat m700. All the hydraulics and drive motors work good. I Bought it with a blown Wisconsin and swapped a 27 hp Briggs and Stratton I had in a extra mower. I used a 40 hp rated 3-way 90 degree gear box to get the vertical shaft to work. It was real simple to swap. If you don't like the vertical shaft you could easily swap a horizontal shaft Predator or something. I also have the ROPS but it would need to be altered if the vertical shaft engine is going to stay in place. Runs, lifts, and moves around good. No major leaks.