Same exact problem my 1450 had with the worn side of piston, is the Kohler weak spot. I think it's the way it pushes the piston up, or maybe the off balance, whatever it is it's the wear point on Kohler K series or the 14 HP anyway. I bet you get lucky, and the bore is perfect, only the aluminum piston being wore.
check rubber flex disk on the drive shaft, also if it's bad rusty, or you just want to do a nice upgrade that you will no longer have to worry with the drive shaft get some Stainless round or 4140 round stock 5/8" diameter, and you can build a nice drive shaft that will last forever. When the motor mounts go it puts undue stress on the rubber flex disk, my rubber flex disk (rag joints) were shot and my ISO mounts were in good shape
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