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Thanks to all the helpful input in this thread, I found a new Kohler model that replaced the engine in my 20 year old mower perfectly. Pic below. Machine runs great now.

Yea, one cylinder has damage to the very bottom of the bore, nearest to the where the exhaust manifold bolts on. In the photos I attached to my original post, it's easy to see. The other cylinder, however, also has some damage to the lining, but it is located in the upper half of the bore. I...

I see what you added. That is terrific. There is no space limit on the air cleaner. I was prepared to make necessary modications to the wiring harness (figured at minimum that the newer engine uses different connectors than the old one), but maybe not (fingers crossed). It may take me a...

I do. Here is a pic of the engine tag:

TBH, I can't recall if it mentioned CVs as well. I think I found the statement in a CH repair manual. Wiki says this in their write up on nikasil: "The coating was further developed as a replacement for hard-chrome plated cylinder bores for Mercury Marine Racing, and Kohler Engines . . ." I...

Forgot to ask a (dumb) question. Does the crank length refer to the length of the nose (i.e., the part of crank that extends beyond the case)? Just curious if I need to investigate whether I might run into any issue mounting and operating the clutch on this machine if I replace a crank with a...

I was surprised to, but that's why posted the photos. The delamination is interesting, to say the least. FWIW, I found this from a Kohler publication: "Some CH25-26 engines feature POWER- BORE™ cylinders a special patented nickel- silicone plating process for increased power, superior oil...

Super helpful. Thanks!

I have checked on that currently. No luck. I wouldn't mind picking up the whole mower if it has low hours. Having a 2nd for parts would be nice. Saw I missed out on a really nice machine out-of-state that sold last April. I realize now that I should have been more proactive being on the...

I'm willing to go with a complete engine if it won't present problems hooking up to the existing cables or wiring harness. When I research availabilty, complete CV-730 engines (which I understand replaced the CV-725 I have) seem tied to make and model of mower. The complete engine for my mower...

The engine powers a MTD PRO Z 2560 zero turn mower. The complete engine for that machine is discontinued. For that reason, I'm thinking I have no choice but to find a short block that works and go from there. I figure a complete replacement engine designed for another machine won't interface...

Label for the engine that needs a short block is in the pic below. My research suggests that Kohler 24-522-264 will work. Anyone know if that is correct?

Yea, the fact that both cylinders experienced delamination of the nikasil cylinder wall coating suggests either or both overheating and lubrication failure. I'm trying to decide between a short block or a complete engine. Heads looks good, but they are 15 years old, like everything else on...

What would cause this (photos attached)? The engine powers a 15 year old zero turn that gets worked pretty hard 3 months out of the year. I'd like to understand the failure mechanism here so I can avoid (or delay) it with the new engine I'll have to put into this machine.