Small Engine Troubleshooting Problems? Ask a Mechanic Now.
Hi, my name is***** will be assisting you.
Based on information I have found through Kohler the replacement will be a CH23S-76528. It is being shown as a direct replacement for you existing engine.
I found a place that indicates that they have one in stock, but only one as long as no one else places an order before you would there is a chance that you could get it.
http://www.lawnmowerpros.com/detail.asp?id=PA-76528 Told me by phone that they have one left in inventory.
http://www.sourceapart.com/index.php?route=product/product&product_id=1320057 They show it to be discontinued but will still allow you to order.
https://usenginescorp.com/shop/index.php?id_product=320881&controller=product Also indicated last item in stock
See if any of these help you. I am going to continue to work to see if I can find anything else as well and will post back here if I find anything.
I have found three other engines that may work on your machine based on crankshaft size and length. They are all three made for John Deere mowers.
Any one of these can be purchased through http://www.smallenginewarehouse.com
Let me know if you need additional assistance with this.