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Hi, Wow! the ZTS is one of the rarest forms of the MM Z. There should be a plate on the engine crankcase just above the starter that tells the engine model and displacement. Most posts I have read suggest that if the PTO has red paint on it it was an add-on. If it was on the tractor as it came down the assembly line it was painted yellow. I don't know what you have in the way of a distribuitor, but some Z's came with distribuitors. If it was converted using all MM parts, it requires changing the oil pump shaft drive gears on both the oil pump shaft and camshaft. However, I have seen two other different ways to put coil ignition on a MM ZT. The first involves converting the old magneto into a distribuitor. The second involves mating an IH distribuitor and reduction gear assy to the magneto flange on the ZT block. For horsepower, depending on the cylinder head, I guess 25-30. It is possible to convert from 6 to 12v. I don't think this will matter much to anyone except a real restoration purist. and it will probably be much easier to crank it. I do understand that putting 12v through a 6v starter can crack the pole plate on the end of the starter, but I have not witnessed one cracking. The way I've done my last two tractors is to get 12v generators. This probably will require rewiring your tractor if it has the one-element cutout relay. If you keep the cover on the battery box, no one will ever know. Good Luck with your ZTS!
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