My CH22 Kohler broke the cam a few yrs ago,it broke the front button off,it then jumped time,and the pistons and valves kissed..... I had a parts engine that had a bad cylinder from water getting in and rusting.I robbed the crank,cam,lifters pushrods,and valves out of it,and ran it another 3 yrs(about 300 hrs a yr),and it broke again last summer.I do not neglect my small engines,I clean the fins/shrouds constantly,air filter maint is alway done,this engine had oil/filter changes ever 60hrs with Shaeffers 10w30,or 5w40 syntheti,,and ran at 3600RPM nonstop in a mower.
I have 3 other Kohler commands,with about 6000 hrs combined and none had this problem exc this particular engine.I didnt even bother pulling it apart this time,simply spun the crank,and see nthe valves werent moving thru the oil fill hole.One thing i will say is it gave a warning,excess mechaincal noise about 50 hrs before failure.All valves were in adjustment,oil pressure was 50psi off idle,and 25 psi at idle.I pulled the front cover abotu a month before it scattered,both times,there was nothing to indicate it was going to break the cam.
I too am looking for horizontal shaft kohler command parts/engine in need or repair.
FWIW,if that engine is a verticle shaft,the BEST price ive found on the CV 25 is here ,you cant beat that price.I need horizontal shaft engines though....
https://surpluscenter.com/item.asp?UID=2009051322222941&item=28-1682&catname=engines