Cub 109 Engine Swap ?
 

Can anyone give me any info on what kind of problems I would have in trying to replace the K241A in my 109 , with a Kohler M12S ? Will the mount hole match , will the K241 PTO fit the M12S ? Stuff like this I would like to know , if anyone has done this . Thanks

If the M12 is out of a Cub Cadet, it should bolt right up. If not, then good luck.

Why would you do that anyway? I'm not a big fan of the Mag engines as replacements for the K series. They don't run near as good. Too many things are "locked" in place on them and you can't adjust it. (Timing is one example.) What's wrong with the motor on your 109?

Long story short , I traded the 109 to my brother-in-law after putting in a new rings/piston/rod , and it later blew , and I mean BLEW , I think it was run to hard at first . Anyway , I offered to put another engine in it for him , at his expense , and I found the M12 that a friend has , and it is in a Wheel Horse .

Out of a WH it likely won't work. Wrong crank, mat evendors be wrong block.