I have a 1983 Case 444 Hydriv garden tractor with a Kohler 321. The Kohler is getting tired but it runs good and is easily rebuildable and has earned it.

Also have a newer Sears/Husqvarna 54" cut tractor style mower with a v-twin Kohler. Probably 50 hours on it. It kinda sounds like a Harley with a propeller. Both Kohlers seem to be good motors. Mostly my better-half runs the newer mower and she loves it. By the time we get the new place cleaned up the Sears mower will probably have taken a serious beating and a zero turn could be a consideration at that point.

Don't ever buy those cheap, crappy, weak batteries for lawn equipment. Spend a few extra bucks and get the one that is about twice as strong.

Baaah. Baaah.