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I have a Grasshopper Model 618 purchased in 2000 and the engine is a Kohler TH18S. I purchased parts for the timing belt. I need help and instructions on how to set the timing on this engine. Can anyone provide instructions or a link on how to do this?

Believe it or not Kohler have all of their repair manuals on their web page as a free download.
It is a bit klunky to navigate around so some prefer to use this site https://www.mymowerparts.com/pdf/Kohler-Service-and-Repair-Manuals/