December 1, 2015

How to replace a snowblower spark plug

By Lyle Weischwill
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 replacement part.

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

Quick links
Tools required
Spark plug gap gauge
Socket that fits the spark plug
Ratchet
Small hammer (optional)
Repair difficulty
Time required
15 minutes or less
Repair difficulty
Time required
15 minutes or less

Instructions

01.

Remove the spark plug

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

Remove the spark plug.

Remove the spark plug.

02.

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. 

Gap the spark plug.

Gap the spark plug.

03.

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.

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.
Symptoms for gas snowblowers

Choose a symptom to see related snowblower repairs.

Main causes: stale gas, clogged carburetor, clogged or broken fuel line, dirty spark plug, bad rewind starter, incorrect valve lash
Main causes: broken shear pins, worn or loose auger drive belt, auger drive cable failure, damaged auger, bad gear case
Main causes: loose drive clutch cable, damaged drive clutch cable, worn friction disc, scraper blade scraping the ground, engine problems
Main causes: punctured tire, damaged rim
Main causes: snow build-up in chute, chute drive mechanism failure, bad chute control assembly
Main causes: clogged chute, damaged auger blades, broken shear pins, worn auger belt, damaged gear case, engine problems
Main causes: dirty carburetor, stale fuel
Main causes: clogged chute, snow build-up in auger housing, broken auger shear pins, auger drive belt needs adjustment, auger cable problems
Things to do: replace the spark plug, change the oil, rebuild the carburetor, adjust valve lash, adjust or replace the belts
Repair guides for gas snowblowers

These step-by-step repair guides will help you safely fix what’s broken on your snowblower.

December 1, 2015
By Lyle Weischwill
How to replace a snowblower spark plug

You need a spark to fire up the engine of your snowblower, and that spark comes from a spark plug. You can replace one in minutes.

Repair difficulty
Time required
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To prevent damage to your snowblower auger, replace the skid shoes when both sides of the shoe are worn. It's an easy repair that you can handle yourself.

Repair difficulty
Time required
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Articles and videos for gas snowblowers

Use the advice and tips in these articles and videos to get the most out of your snowblower.

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How to lubricate a snowblower auger shaft video
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This video shows how to how and where to lubricate the auger shaft on a snowblower.

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