I've worked on a couple of these many many years ago, on a Gravely, and we converted them to using points and a battery ignition coil. The solid state parts were way to expensive.
You have to make sure the block has the place for the points on the side of it. If it doesn't, this won't work. You'll need to get the points, condenser, and the plunger rod that activates them. Also a 12 volt coil from Kohler or suitable aftermarket. You'll also need to change the keyswitch on your tractor, or use a separate toggle switch to turn the engine on and off. If you have the Kohler service manual, there is a diagram in there how to wire the battery coil to work. Basically, positive comes from your battery and switch to the + side of coil. the wire from the - terminal of the coil goes to the points and condensor. Then set the points for 0.020. Once running you can use a timing light to set the point gap precisely for proper timing.
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Today's Featured Article - 12-Volt Conversions for 4-Cylinder Ford 2000 & 4000 Tractors - by Tommy Duvall. After two summers of having to park my old 1964 model 4000 gas 4 cyl. on a hill just in case the 6 volt system, for whatever reason, would not crank her, I decided to try the 12 volt conversion. After some research of convert or not, I decided to go ahead, the main reason being that this tractor was a working tractor, not a show tractor (yet). I did keep everything I replaced for the day I do want to restore her to showroom condition.
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