Craftsman Chainsaw Spark Plug Parts

Craftsman Chainsaw Spark Plug Parts

A fouled or worn spark plug is one of the quickest fixes for a Craftsman chainsaw that won't start, runs rough, or stalls under load. The spark plug ignites the fuel-air mixture inside the engine — when it's dirty, corroded, or gapped wrong, ignition fails. Checking and replacing your spark plug is a five-minute job with the right OEM part.

Craftsman chainsaws use specific heat-range spark plugs matched to engine displacement. Aftermarket plugs or wrong heat ranges can cause hard starts, fouling, or poor fuel economy. Use your model number to find the correct Champions or NGK plug for your saw — and always gap it to factory spec before installation.

• Spark plug won't fire: fouled from rich fuel mix or sitting unused; clean or replace
• Engine runs rough or stalls: plug tip burned black; replace with correct heat range
• Hard starting in cold weather: wrong spark plug heat range; verify OEM spec
• Plug gaps wide or electrode worn: age-related failure; new plug restores ignition
• Oil fouling on electrode: two-stroke fuel mix ratio wrong; replace plug and verify fuel mix

Enter your Craftsman chainsaw model number above to see the exact spark plug and gap specification. OEM plugs cost $3 to $8 and are one of the easiest preventive maintenance items you can keep on hand.

Craftsman Chainsaw Spark Plug FAQs

What spark plug does my Craftsman chainsaw use?

Craftsman chainsaws use Champions or NGK plugs matched to engine size — typically Champion RJ19LM or NGK BR2LM for most Craftsman gas saws. The heat range (the middle number) matters: hotter plugs for high-speed/high-load engines, cooler plugs for lower-displacement or lower-RPM saws. Always verify the OEM spec in your manual or use your model number to confirm the exact plug and gap. Using the wrong heat range causes fouling or overheating.

How do I know if my spark plug is bad?

A bad spark plug shows up as hard starting, rough running, stalling under load, or complete failure to fire. Remove the plug and look at it: black sooty buildup means a rich fuel mix or fouled plug (try cleaning it first); a gap that's visibly wide means the plug has worn and lost its spark. The fastest test is a spark-check: remove the plug, reinsert it in the cap with the electrode about 1/8" from the cylinder, and pull the cord — if you don't see a bright blue spark, the plug is dead.

How often should I replace my Craftsman chainsaw spark plug?

Inspect it every 25 to 50 hours of use. A good spark plug lasts 100+ hours if you maintain correct fuel mix (typically 50:1 for two-stroke Craftsmans). If you store your chainsaw for the off-season, replace the spark plug in spring — old fuel residue fouls plugs during storage. Keeping a spare plug in your toolbox is smart — they're inexpensive insurance against being stranded mid-job.

What happens if I use the wrong spark plug?

A plug with the wrong heat range causes fouling (too cold, runs rich) or electrode wear/gap growth (too hot, burns too fast). Either way, you'll see hard starts and rough running. If your chainsaw repeatedly fouls plugs, the real problem is likely fuel mix ratio or a carburetor running too rich — but start by confirming you're using the exact OEM heat range for your model.

Order Craftsman Chainsaw Spark Plug Replacement Online

Keep your Craftsman chainsaw running efficiently by replacing a faulty spark plug promptly. With same-day shipping on most in-stock items, you'll have your replacement part fast, minimizing downtime. Our model/part number lookup finds the exact OEM part for your unit, and every order is backed by our 365-day return policy and price-match guarantee. If your Craftsman chainsaw spark plug is failing — showing symptoms like reduced performance, unusual noise, or complete non-operation — replacement is typically the fastest fix. Browse our full library of Craftsman repair resources for troubleshooting guides and installation videos.

Craftsman Chainsaw Model Number: Where to Look

On Craftsman chainsaws, look for the model number on the powerhead housing, near the rear handle, or beneath the top cover. Check the label carefully, since the model number may appear alongside the serial number and other engine information. You need the model number for the entire chainsaw, not just the spark plug or another individual part. Type it into our model number lookup and the catalog narrows to parts made for your unit, including ignition, fuel, cutting, and engine parts. Matching the full Craftsman model before you order helps confirm compatibility and prevents parts mix-ups. That means fewer wrong orders and a faster repair.