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Small Engine Spark Plug - How it Works & Installation Tips

This video provides general information on small engine spark plugs and general installation guidelines.

Small Engine

String trimmer won't start

Inspect the spark plug for signs of wear or damage. If the porcelain insulator is cracked, an electrode is burned away or damaged, or there is heavy carbon buildup at the electrode, replace the spark plug. To determine if the spark plug is defective, use a spark plug tester. You should see a strong spark between the tester’s terminals when the engine is cranking. If there is no spark, this indicates that the spark plug is defective and should be replaced.

String trimmer runs rough

Edger won't start

The spark plug ignites the fuel and air mixture in the engine's cylinder to power the engine. If the spark plug is defective, the engine may not start. To determine if the spark plug is defective, remove the spark plug and inspect it. If the porcelain insulator is cracked, an electrode has been burned away or damaged, or there is heavy carbon buildup at the electrode, replace the spark plug. Alternatively, if the spark plug hasn’t been replaced in a few seasons, replace it.

Leaf blower won't start

Leaf blower running rough

Hedge trimmer won't start

Hedge trimmer runs rough

Edger runs rough

The spark plug ignites the fuel and air mixture in the engine's cylinder to power the engine. If the spark plug is defective, the engine may run roughly. To determine if the spark plug is defective, remove the spark plug and inspect it. If the porcelain insulator is cracked, an electrode has been burned away or damaged, or there is heavy carbon buildup at the electrode, replace the spark plug. Alternatively, if the spark plug hasn’t been replaced in a few seasons, replace it.

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Spark Plug

String trimmer won't start? This video provides information on how to troubleshoot a string trimmer that won't start and the most likely defective parts associated with this problem. Commonly replaced string trimmer parts: Air Filter Spark Plug Carburetor Start Pulley Pull Rope Starter Gas Tank Fuel Line The information provided in this string trimmer troubleshooting video is applicable to all string trimmer brands: Ariens, Bolens, Craftsman, Cub Cadet, Dixon, Echo, Exmark, Green Machine, Homelite, Honda, Huskee, Husqvarna, John Deere, Lawn Boy, MasterCut, Montgomery Wards, MTD, Murray, Poulan, Poulan Pro, Ryobi, Simplicity, Toro, Snapper, Troy-Bilt, Turf King, Weed Eater, Wheel Horse, Worx, Yard Machines, Yard-Man

Top Reasons String Trimmer Not Starting — String Trimmer Troubleshooting

Leaf blower won't start? This video provides information on how to troubleshoot a leaf blower and the most likely defective parts associated with this problem. Commonly replaced leaf blower parts: Starter Assembly Pull Rope Gas Tank Fuel Line Carburetor Fuel Filter Air Filter The information provided in this leaf blower troubleshooting video is applicable to all leaf blower brands: Ariens, Bolens, Craftsman, Cub Cadet, Dixon, Echo, Exmark, Green Machine, Homelite, Honda, Huskee, Husqvarna, John Deere, Lawn Boy, MasterCut, Montgomery Wards, MTD, Murray, Poulan, Poulan Pro, Ryobi, Simplicity, Toro, Snapper, Troy-Bilt, Turf King, Weed Eater, Wheel Horse, Worx, Yard Machines, Yard-Man

Top Reasons Leaf Blower Won't Start — Leaf Blower Troubleshooting

Edger won't start? This video provides information on how to troubleshoot an edger and the most likely defective parts associated with this problem. Commonly replaced edger parts: Starter Assembly Pull Rope Gas Tank Fuel Line Carburetor Fuel Filter Air Filter The information provided in this edger troubleshooting video is applicable to all edger brands: Ariens, Bolens, Craftsman, Cub Cadet, Dixon, Echo, Exmark, Green Machine, Homelite, Honda, Huskee, Husqvarna, John Deere, Lawn Boy, MasterCut, Montgomery Wards, MTD, Murray, Poulan, Poulan Pro, Ryobi, Simplicity, Toro, Snapper, Troy-Bilt, Turf King, Weed Eater, Wheel Horse, Worx, Yard Machines, Yard-Man

Top Reasons Edger Won't Start — Edger Troubleshooting

Hedge Trimmer won't start? This video provides information on how to troubleshoot a hedge trimmer and the most likely defective parts associated with this problem. Commonly replaced hedge trimmer parts: Starter Assembly Pull Rope Gas Tank Fuel Line Carburetor Fuel Filter Air Filter Blade Spark Plug The information provided in this hedge trimmer troubleshooting video is applicable to all hedge trimmer brands: Ariens, Bolens, Craftsman, Cub Cadet, Dixon, Echo, Exmark, Green Machine, Homelite, Honda, Huskee, Husqvarna, John Deere, Lawn Boy, MasterCut, Montgomery Wards, MTD, Murray, Poulan, Poulan Pro, Ryobi, Simplicity, Toro, Snapper, Troy-Bilt, Turf King, Weed Eater, Wheel Horse, Worx, Yard Machines, Yard-Man

Top Reasons Hedge Trimmer Won't Start  — Hedge Trimmer Troubleshooting

Hedge Trimmer starts then stalls? This video provides information on how to troubleshoot a hedge trimmer and the most likely defective parts associated with this problem. Commonly replaced hedge trimmer parts: Starter Assembly Pull Rope Gas Tank Fuel Line Carburetor Fuel Filter Air Filter Blade Spark Plug The information provided in this hedge trimmer troubleshooting video is applicable to all hedge trimmer brands: Ariens, Bolens, Craftsman, Cub Cadet, Dixon, Echo, Exmark, Green Machine, Homelite, Honda, Huskee, Husqvarna, John Deere, Lawn Boy, MasterCut, Montgomery Wards, MTD, Murray, Poulan, Poulan Pro, Ryobi, Simplicity, Toro, Snapper, Troy-Bilt, Turf King, Weed Eater, Wheel Horse, Worx, Yard Machines, Yard-Man

Top Reasons Hedge Trimmer Starts Then Stalls  — Hedge Trimmer Troubleshooting

Edger starts then stalls? This video provides information on how to troubleshoot an edger and the most likely defective parts associated with this problem. Commonly replaced edger parts: Starter Assembly Pull Rope Gas Tank Fuel Line Carburetor Fuel Filter Air Filter The information provided in this edger troubleshooting video is applicable to all edger brands: Ariens, Bolens, Craftsman, Cub Cadet, Dixon, Echo, Exmark, Green Machine, Homelite, Honda, Huskee, Husqvarna, John Deere, Lawn Boy, MasterCut, Montgomery Wards, MTD, Murray, Poulan, Poulan Pro, Ryobi, Simplicity, Toro, Snapper, Troy-Bilt, Turf King, Weed Eater, Wheel Horse, Worx, Yard Machines, Yard-Man

Top Reasons Edger Starts Then Stalls — Edger Troubleshooting

Hedge Trimmer runs rough? This video provides information on how to troubleshoot a hedge trimmer and the most likely defective parts associated with this problem. Commonly replaced hedge trimmer parts: Starter Assembly Pull Rope Gas Tank Fuel Line Carburetor Fuel Filter Air Filter Blade Spark Plug The information provided in this hedge trimmer troubleshooting video is applicable to all hedge trimmer brands: Ariens, Bolens, Craftsman, Cub Cadet, Dixon, Echo, Exmark, Green Machine, Homelite, Honda, Huskee, Husqvarna, John Deere, Lawn Boy, MasterCut, Montgomery Wards, MTD, Murray, Poulan, Poulan Pro, Ryobi, Simplicity, Toro, Snapper, Troy-Bilt, Turf King, Weed Eater, Wheel Horse, Worx, Yard Machines, Yard-Man

Top Reasons Hedge Trimmer Runs Rough  — Hedge Trimmer Troubleshooting

Edger runs rough? This video provides information on how to troubleshoot an edger and the most likely defective parts associated with this problem. Commonly replaced edger parts: Starter Assembly Pull Rope Gas Tank Fuel Line Carburetor Fuel Filter Air Filter The information provided in this edger troubleshooting video is applicable to all edger brands: Ariens, Bolens, Craftsman, Cub Cadet, Dixon, Echo, Exmark, Green Machine, Homelite, Honda, Huskee, Husqvarna, John Deere, Lawn Boy, MasterCut, Montgomery Wards, MTD, Murray, Poulan, Poulan Pro, Ryobi, Simplicity, Toro, Snapper, Troy-Bilt, Turf King, Weed Eater, Wheel Horse, Worx, Yard Machines, Yard-Man

Top Reasons Edger Runs Rough — Edger Troubleshooting

Leaf blower starts then stalls? This video provides information on how to troubleshoot a leaf blower and the most likely defective parts associated with this problem. Commonly replaced leaf blower parts: Starter Assembly Pull Rope Gas Tank Fuel Line Carburetor Fuel Filter Air Filter The information provided in this leaf blower troubleshooting video is applicable to all leaf blower brands: Ariens, Bolens, Craftsman, Cub Cadet, Dixon, Echo, Exmark, Green Machine, Homelite, Honda, Huskee, Husqvarna, John Deere, Lawn Boy, MasterCut, Montgomery Wards, MTD, Murray, Poulan, Poulan Pro, Ryobi, Simplicity, Toro, Snapper, Troy-Bilt, Turf King, Weed Eater, Wheel Horse, Worx, Yard Machines, Yard-Man

Top Reasons Leaf Blower Starts Then Stalls  — Leaf Blower Troubleshooting

Leaf blower runs rough? This video provides information on how to troubleshoot a leaf blower and the most likely defective parts associated with this problem. Commonly replaced leaf blower parts: Starter Assembly Pull Rope Gas Tank Fuel Line Carburetor Fuel Filter Air Filter The information provided in this leaf blower troubleshooting video is applicable to all leaf blower brands: Ariens, Bolens, Craftsman, Cub Cadet, Dixon, Echo, Exmark, Green Machine, Homelite, Honda, Huskee, Husqvarna, John Deere, Lawn Boy, MasterCut, Montgomery Wards, MTD, Murray, Poulan, Poulan Pro, Ryobi, Simplicity, Toro, Snapper, Troy-Bilt, Turf King, Weed Eater, Wheel Horse, Worx, Yard Machines, Yard-Man

Top Reasons Leaf Blower Runs Rough — Leaf Blower Troubleshooting

String trimmer head won't spin? This video provides information on how to troubleshoot a string trimmer and the most likely defective parts associated with this problem. Commonly replaced string trimmer parts: Trimmer Head Trimmer Housing Start Pulley Pull Rope Starter Gas Tank Fuel Line The information provided in this string trimmer troubleshooting video is applicable to all string trimmer brands: Ariens, Bolens, Craftsman, Cub Cadet, Dixon, Echo, Exmark, Green Machine, Homelite, Honda, Huskee, Husqvarna, John Deere, Lawn Boy, MasterCut, Montgomery Wards, MTD, Murray, Poulan, Poulan Pro, Ryobi, Simplicity, Toro, Snapper, Troy-Bilt, Turf King, Weed Eater, Wheel Horse, Worx, Yard Machines, Yard-Man

Top Reasons String Trimmer Head Not Spinning — String Trimmer Troubleshooting

String trimmer starting, then stalling? This video provides information on how to troubleshoot a string trimmer that is starting and stalling and the most likely defective parts associated with this problem. Commonly replaced string trimmer parts: Air Filter Spark Plug Carburetor Start Pulley Pull Rope Starter Gas Tank Fuel Line The information provided in this string trimmer troubleshooting video is applicable to all string trimmer brands: Ariens, Bolens, Craftsman, Cub Cadet, Dixon, Echo, Exmark, Green Machine, Homelite, Honda, Huskee, Husqvarna, John Deere, Lawn Boy, MasterCut, Montgomery Wards, MTD, Murray, Poulan, Poulan Pro, Ryobi, Simplicity, Toro, Snapper, Troy-Bilt, Turf King, Weed Eater, Wheel Horse, Worx, Yard Machines, Yard-Man

Top Reasons String Trimmer Starting, Then Stalling — String Trimmer Troubleshooting

String trimmer line won't feed? This video provides information on how to troubleshoot a string trimmer and the most likely defective parts associated with this problem. Commonly replaced string trimmer parts: Trimmer Head Trimmer Housing Trimmer Line The information provided in this string trimmer troubleshooting video is applicable to all string trimmer brands: Ariens, Bolens, Craftsman, Cub Cadet, Dixon, Echo, Exmark, Green Machine, Homelite, Honda, Huskee, Husqvarna, John Deere, Lawn Boy, MasterCut, Montgomery Wards, MTD, Murray, Poulan, Poulan Pro, Ryobi, Simplicity, Toro, Snapper, Troy-Bilt, Turf King, Weed Eater, Wheel Horse, Worx, Yard Machines, Yard-Man

Top Reasons String Trimmer Line Not Feeding — String Trimmer Troubleshooting

String trimmer running rough? This video provides information on how to troubleshoot a string trimmer that is running rough and the most likely defective parts associated with this problem. Commonly replaced string trimmer parts: Air Filter Spark Plug Carburetor Start Pulley Pull Rope Starter Gas Tank Fuel Line The information provided in this string trimmer troubleshooting video is applicable to all string trimmer brands: Ariens, Bolens, Craftsman, Cub Cadet, Dixon, Echo, Exmark, Green Machine, Homelite, Honda, Huskee, Husqvarna, John Deere, Lawn Boy, MasterCut, Montgomery Wards, MTD, Murray, Poulan, Poulan Pro, Ryobi, Simplicity, Toro, Snapper, Troy-Bilt, Turf King, Weed Eater, Wheel Horse, Worx, Yard Machines, Yard-Man

Top Reasons String Trimmer Running Rough — String Trimmer Troubleshooting

Spark-Plug