One major wiring difference will be the addition of a kill circuit for your magneto fired CH-18 versus the points/coil KT-17. You will need a different ignition switch from a 1811 model tractor.
I have become very good at pulling Kohlers from these to fix or replace different issues. I found an excellent replacement M-18 engine to replace my governor-less M-18, my second tractor lost all of its flywheel magnets, so I replaced the flywheel, and my third tractor needed a new crank pilot bushing and magneto, so it too had to be pulled.
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