There is a safety switch on the clutch which doesn't go bad very often but it has a metal bracket that comes off the clutch shaft to energise the switch and that metal bracket sometimes breaks.
The most common problem is the PTO switch. It has to be in the off position for the starter to engage and sometimes the contacts get intermittent in the off position. Hold the start switch on and wiggle the PTO switch and sometimes that will energise the safety circuit.
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