Yes, the bigger kohler singles have compression releases.
The KT/ Magnum engines have no compression releases.
I'd be checking that the battery cables ( both positive and negative) making sure they are clean and tight,
also don't forget the terminals on the solenoid as they tend to rust.
How old is the battery? does it pass a load test?
Also sometimes the starting motor brushes wear out.
I'd not worry about compression unless you smell gas and it belches black smoke on warm starting, as that might be hydro locking due to excessive fuel because of fuel boil in the carb, or a leaking needle/seat flooding the cylinders.
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