I have a commercial Gravely 260Z with a 60" deck and hydraulic deck lift. Model 922020 and has 1,366 hrs. I run it in the winter also with a front mounted 46" single stage snow blower. It has a Kohler CV25S (CV730) engine on it that has run very good for all these years. It has always run a little rich, but this engine does not have consumer accessible mixture needle valves to adjust it. It has had an oil leak for the last 7 years. Not terrible, but leaves spots on the floor after each use and also gets sprayed onto the belts and clutch which forces shorter belt life. I love the unit and mechanically, it is doing really well. I also have a lot of attachments that I made mounts for that work very well. (fertilizer, de-thatcher, sprayer and snow blower), so I want to keep it as long as it works good. I would like to replace the engine with a new one and I am looking for others thoughts on what to get. I know all the dimensions and there are Kohler replacements. Just wondering if I should look at equivalent engine from others. (Kawasaki, Briggs, etc) I'm pretty mechanically minded and have done all my repairs and modifications to date. I know I can probably replace the oil pan for less than $400, but then I still have the same rich running engine with high engine hours. In looking at some alternatives, the Kawasaki seems to be the most expensive, but also has better reviews.