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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".
You don't have to gap the plugs on 2 cycle and 4 cycle equipment. They are already pregapped. Look at the part number of the plug and go get yourself an E3 brand plug which covers multiple plug numbers...best plugs on the market.
Spark plug gaps for lawnmowers and lawn tractors are not as critical as they are for motor vehicles. Generally, an acceptable spark gap is anywhere between .025" and .035".
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