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If I am going to repair, I will do it myself. Also, if I have to replace with a new (rebuilt) motor, I would do that myself. That appears to be almost trivial since I think there are only 4 bolts mounting the motor on the mower. I think I can get the motor, myself, for about $1300. The shop...

With the KT-725 engine, can you easily change the head gasket and push rods without removing the engine? I assume that is a pretty easy repair, especially if you don't have to remove the engine. I assume you need to remove the muffler. How hard or easy is that?

It is the SS4225 Toro.

I don't know the serial number because it is still in the shop. But, it is a Kohler KT725-3031 for a Toro zero-turn 42".

Sounds to me like just swapping the motor might be a better idea, like the shop suggests. But, that still makes me wonder. If the mouse nest cooked the head, why was one head gasket blown (probably on that cylinder), but the valves stuck and the pushrods bent on the other cylinder...

I did find a bit of a mouse nest, or something like that in one of the sets of cooling fins. Looking at the mower from the back, that would have been the right cylinder, I don't know which is officially the left and the right, but if that is the right, then it was the one with the stuck valves...

I just found out that I have a head gasket on one cylinder and stuck valves, with bent push rods on the other cylinder. The shop thinks by overheating, but it had plenty of oil, but the ethanol crap gas was old. They think that might have destroyed the engine. Does that sound right? I gather it...