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First disconnect the spark plug wire from the spark plug. Then use a socket wrench to remove the spark plug. Install the new spark plug into the cylinder head and reconnect the spark plug wire. The Toro CCR 3650 uses a NGK BPMR4A plug gapped to 0.032".
27 years of service for an ignition coil is close to amazing. Recent machines using magneto-type ignition systems are doing well if their Chinese-made coils last a couple of seasons.
I'm pretty sure that is what has failed in your Toro and I hope you can get a replacement from really old stock so you aren't doing this again in a couple of years.
A tip: Use something to measure the gap between the magnets of the rotor and the core of the current ignition coil before you remove it and set the gap the same for the new one.
Some setups are fussy about that gap.
Could be magneto bad, wire from magneto bad, ground on magneto bad, or the clearance between the flywheel and the magneto is rusted up if it was outside. Clean flywheel with sandpaper and set magneto gap using a match book flap.
Check your armeratur air gap. Where your flywheel is, it is a magnet on the fly wheel that when it goes around the armeratur it sends a spark, the depth needs to be business card size gap from the flywheel. If you remove the pull start housing you will see the spark plug wire running to the armeratur by adjusting that closer or farther away you get more volts which means more sparks. If that doesnt work replace the part and you will get spark.