Gran pa prolly would of liked to see a mag 18 bolt in it, or a series II, and they are around, just not as plentiful as they used to be.
Those engines are as near to original as you can get.
Others here are liking to do conversions to later model overheads V twins.
If it slowed then stopped, it was prolly from lack of oil to the rods on the crank, and it seized, if done @ speed they almost always holed the block with a broken rod.
That is typical of series 1 engines, and they are really not worth rebuilding, and most internal parts are NLA.
they had a lousy oiling system and it cost Kohler a lot of warranty replacements and it's reputation nearly.
Myself, I like the M-18's/or series II, a true opposed engine is smooth and torquey.
Fuel usage and emission requirements killed them.
The M-18's were the last and best of the series.
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