I believe it’s a Kohler Command CH20And which of the 5 or 6 different Kohler named engines with a few thousands variations do you have. Engine Model and spec number please.
Thank you for the info!Something to check is on some of those engines the hydraulic lifters will flat spot on the bottom and make a knocking noise, And in some cases may come and go. Requires removing the valves and pushrods and pulling out the lifters to check the bottom for a wear line.