The manual I found for the Confidant zt710-740 says there is a release. The zt740 is a 25hp Confidant, which matches the motor, though I don't have the model off the motor. If nothing else, when I do the valves, I can check for the release function. I found several saying it could be valve adjustment, compression release, or valve guide.
Manual is here, https://resources.kohler.com/power/kohler/enginesUS/pdf/16_690_01_EN.pdf
Manual is here, https://resources.kohler.com/power/kohler/enginesUS/pdf/16_690_01_EN.pdf
