image

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

LT-250

MS-20 C

PE-251

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.

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.

**We’re excited to be able to offer trade professionals like you substantial volume-based discounts. Our PRO pricing levels are based on your anticipated annual parts spend with us. If your actual monthly spending trends lower than anticipated, your discount may change.

Frigidaire Appliance Parts and Heating & Cooling Parts.

Sign up for your PRO account

Create your account for exclusive discounts and benefits, like:

Your One-Stop

Shop

Join Frigidaire Pro to unlock technician pricing, same-day shipping, dedicated support, and exclusive benefits tailored for repair professionals.

PRO users get exclusive discounts and benefits, like:

This account is not eligible, please contact your customer service representative for any questions.

Unlock technician pricing and exclusive Pro benefits at Frigidaire. Join free today.

Frigidaire Pro

Frigidaire Pro | Discounts & Benefits for Technicians

Your discounted pricing and other Pro benefits are now available.

Thank You for joining Frigidaire Pro!

Return parts & products within 30 days of placing your order.

Adhesives & Sealants Parts

Appliance Adhesive & Sealant Parts

Air Filters

Air Filters for Home

Appliance Cleaners

Appliance Cleaners for Sale

Dishrack Parts

Dishrack Replacement Parts

Dryer Vents

Dryer Venting Parts

Equipment Covers

OPE, HVAC & Appliance Part Covers

Fuel Treatments

Fuel System Treatments

Hardware & Fasteners

Hardware and Fasteners Parts

Kitchen Appliance Accessories

Kitchen Accessories Parts

Washer & Dryer Accessories

Dryer and Washer Accessories

Light Bulb Parts

Light Bulb Fixture Parts

Oil & Lubricants

Oil and Lubricant Parts

Paint & Supplies

Touch Up Paint & Supplies

Power Cords Parts

Power Cord Repair Parts

Safety Equipment Parts

Safety Equipment Spare Parts

Testing Equipment Parts

Testing Appliance, OPE & HVAC Parts

Specialty Tools Parts

Specialty Tool Parts for Sale

Vacuum Attachments

Vacuum Attachment Parts

Water Filters & System Parts

Water Filter System Parts

Water Treatment Parts

Water Treatment System Parts

Wire & Connector Parts

OPE, HVAC & Appliance Wire & Connector Parts

Lawn Care Supplies

Yard Care Supplies

Heating & Cooling Supplies

HVAC Supplies

CHANNELLOCK Tools Parts

CHANNELLOCK Replacement Tools

Gas Cans & Nozzles

Nozzles & Gas Cans for Sale

Maintenance Repair Kits

Maintenance Appliance Repair Kits

OPE cleaners & Filters Parts

Outdoor Power Equipment Cleaners & Filters

Power Tools Parts

Power Tool Replacement Parts

Appliances

Refrigerator

Dryer

Range/Stove/Oven

Washing Machine

Dishwasher

Washer/Dryer Combo

Microwave

Freezer

Oven/Microwave Combo

Trash Compactor

Ice Machine

Range Vent Hood

Vacuum Cleaner

Garbage Disposer

Dehumidifier

Hot Water Dispenser

Heating & Cooling

Furnace

Packaged Unit/RTU

Heat Pump

Central Air Conditioner

Air Conditioner

Air Handler

Humidifier

String Trimmer

Edger

Hedge Trimmer

Craftsman

Dolmar

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

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

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

Lawn & Garden

Spark-Plug

91044 Spark Plug | Ships Today! 30-Day Returns

91044 Spark Plug

This part 91044 is compatible with:

Related Articles & Videos

Spark Plug Customer Reviews

Common Problems Fixed by the Spark Plug

String trimmer won't start

Edger won't start

Hedge trimmer won't start

String trimmer runs rough

Hedge trimmer runs rough

Edger runs rough

About the Spark Plug

Popular models

Shop by Brands

Repair Help by Brands and Product Type

Alternative Part Number(s)