How to replace a 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 snowblower part.

If the spark plug fouls quickly after you replace it, then engine problems could be apparent.

You’ll typically see either carbon deposits or oil deposits fouling the spark plug. The type of spark plug fouling often points to engine problems that you can resolve to prevent frequently having to replace the spark plug in your snowblower.

Carbon spark plug deposits

Carbon spark plug deposits are typically caused by:

• Rich fuel mixture from a faulty carburetor.

• Ignition system timing problems.

• Faulty ignition system.

• Prolonged idling.

• Using the wrong spark plug.

Resolve these types of issues to prevent excessive carbon deposits on the spark plug.

Oil spark plug deposits

Oil deposits on the spark plug can be caused by overfilling the engine with oil or worn piston rings.

Check these issues when you see oil deposits on the spark plug.

Find additional tips for checking the snowblower spark plug in our How to check and replace a snowblower spark plug article/video.

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