Kohler 17.5 (John deer) commuter, model cr-491s,

[Cline]

Engine will not fire on starter spray
Hyd. Valve lifers, compression 60-70 psi
Flywheel key-good
New spark plug
Spark good finger tested
Removed head, valves appears good
In need of directions

 

[BlazNT]

Engine will not fire on starter spray
Hyd. Valve lifers, compression 60-70 psi
Flywheel key-good
New spark plug
Spark good finger tested
Removed head, valves appears good
In need of directions

60 to 70 PSI is too low. Put a little oil in the spark plug hole and try again and see if the compression goes up if it does you need new rings.