I always wondered why Honda made the decision to discontinue making law tractors. My next-door-neighbor had one that belonged to his dad and it was 30 years old before he had to replace it. And I have always heard positive things about their engines. However, my research concluded that overall the Kawasaki engines are currently the most reliable with the highest torque on the market. Torque(not horsepower) is an important factor especially for ZTR applications.
Honda exited the ride on market because not enough people wanted a top quality mower that will last 20 years standing on it head.
They just wanted cheap and nasty so rather than degrade their product to an inferiour standard that the public would buy in mass they exited the market.
The same thing goes for engines.
The Honda engines were by far the best engineered and made engines but that made them too expensive for Joe public so they exited that market as well and Kawakasi stepped in and proved Honda to be correct.
If you haunt these pages you will see a lot of owners bemoaning the big nosedive in the quality of Kawakasi engines which are being downgraded to a price the public will pay.
The funny thing down here is you can not sell an essential item lke a fire pump unless it has a Honda engine on it.