How to Replace a Snowblower Spark Plug


PD_0071_247_951-10292 snowblower spark plug

The snowblower spark plug creates the spark that ignites the fuel to start engine. If deposits build up on the spark plug electrode or if the ceramic insulation cracks, the spark plug won't create the spark. Fortunately, replacing a spark plug is an easy and inexpensive fix. This step-by-step snowblower repair guide shows how to install and gap a new spark plug using the manufacturer-approved replacement part.

Use these instructions to replace the spark plug in Craftsman, Husqvarna, MTD, Murray, Honda, Toro, Yard-Man and Ariens snowblowers.

Repair difficulty:
Time required:

Less than 15 min.

Parts Required

  • Spark plug

Tools Required

  • Spark plug gap gauge
  • Socket that fits the spark plug
  • Ratchet
  • Small hammer (optional)


 Warning: Undertaking repairs to appliances can be hazardous. Use the proper tools and safety equipment noted in the guide and follow all instructions. Do not proceed until you are confident that you understand all of the steps and are capable of completing the repair. Some repairs should only be performed by a qualified technician.

Step 1: Remove the spark plug

Disconnect the spark plug wire. Use a deep socket and a ratchet to remove the spark plug from the cylinder.

Step 2: Gap the new spark plug

Check your owner’s manual for the correct gap setting. Insert the gap gauge between the electrodes on the spark plug. The gap gauge should fit snuggly between the electrodes; when you pull it out, you should feel only slight resistance. If the gap is too wide, lightly tap the electrode on a clean, hard surface or use a small hammer. If the gap is too small, use the bender on the gap gauge to widen it. 

Step 3: Install the plug

Thread the spark plug into the cylinder. Hand-tighten the spark plug until it’s snug and then use the ratchet and deep socket to tighten the spark plug another ¼ to ½ turn. Don’t overtighten, because the steel base of the spark plug can strip the softer aluminum threads on the cylinder head. 

Reconnect the spark plug wire.