I haven't, but have some tips. Some engines have the same bolt pattern as others. If not, just drill new holes in the mounting plate. You will probably need a new wiring harness and make sure it has the same size output shaft if you want to use the same pulleys. From what I've been told, you can replace a 25 HP Kohler on a DC with a 20 HP Yanmar verticle shaft engine and it will bolt up to the same holes, so they must use a fairly close bolt pattern in engines. I realize this don't help you, but it is just showing you that even a gas to diesel swap is possible without much problems. The new Honda 24 HP is a sweet sounding engine. Good luck.
Where can i get info on the 24 hp honda. I went to their website and I did not find anything there. I like honda engines my civic got 215k miles and started and ran like 50k. I dont know about small engines but they make great car motors.
Either way you go i don't think you'll have to worry about blowing any more head gaskets lol... make sure when you do this that which ever engine you swap... you want the air flow deflector around the engine you may have to modify the ones of the kolhor.
I demoed a Kanga Loader a while back. It had a 20 horse Honda. However, the guy had a Kanga w/ a 24 horse Honda on the trailer. I mentioned that I didn't recall Honda making a 24 horse. He then remined me that the Kanga is built in Australia, and that a 24 horse is available in Australia. Said that they would be available here shortly (apparently they were recently introduced in Australia and then will be introduced here).
Ditto on the Honda engine being great engines. You just can't go wrong w/ either a Hinda or a Kawi.