Welcome!
Well, you can get another head for the one with the wallered out spark plug hole without a great deal of money.
Without question, I'd get the manual for the Original and look in the engine section. Kohler was really good at documenting their procedures and you can get a look at what you're up to by reading the manual (found in the reference section of the forum).
By all means, any Original is worth rebuilding. If you do so, it'll likely outlast you and I!
John
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61 and 63 Originals
123 (2)
782D
106,
147, 122
102 parts
It's only original ONCE!
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