If it is really cold, slow cranking produces less power produced by the flywheel for the coil on the electronic ignition of the M-18's
Reduce your plug gap to .023-.025, change to 5w30 and and start with a closed throttle.
You might try removing the plugs when it is cold and crank it over,you will see
little or no spark, affirming the no start condition.
Aftermarket replacements are more prone to this than genuine kohler ign. units in very cold temps.
a full battery or jumpers, and some kind of heat helps starting.
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