How often should I check and replace the spark plug?
Check the spark plug once a season or every 25 hours of operation. Change the spark plug once a season or every 100 hours. The spark plug must be properly gapped to .02-.03 inches (0.60-0.80 mm) and be free of deposits for proper engine operation.
From the official Craftsman Cmxgbam1054541 Snow Blower manual, page 29
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