homepostsWhat spark plug does a Craftsman lawn mower use?

What spark plug does a Craftsman lawn mower use?

Dennis WaldenSep 13, 2021

Replacement Plug

The Craftsman 4.5hp mower uses either a Champion model RJ19LM or J19LM spark plug, or equivalent, with the gap set at .

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Consequently, how do I know which spark plug for my lawn mower?

Spark plugs are typically located on the back or side of a lawn mower engine. Look for a short wire that's about 1/4-in. -thick leading to the top of a short, cylindrical protrusion from the engine. If you're not sure where the spark plug is, consult your owner's manual.

Hereof, what is the spark plug gap for a Craftsman lawn mower? Flathead Engine Spark Plugs & Gaps
Replacement Part TypeReplacement Spark Plug Options by Briggs & Stratton Part NumberSpark Plug Gap
"Surefire" RJ2YXLE in Craftsman Smooth Start (MRS) lawn mower591040.030”

Just so, what size spark plug does a Briggs and Stratton?

NGK Spark Plugs for Briggs & Stratton Engines

Gap0.028" (0.7mm)
TerminalRemovable Nut
Thread Size14mm
TypeNon-Resistor, Standard
FitsBRIGGS & STRATTON GAS ENGINES -- All models except twin cylinder, Vanguard Intek, 19A400-19G400 series

Do lawn mower spark plugs come pre gapped?

Check the gap on the new spark plug before installing it. A new plug will often come pre-gapped to match your specific engine, but use a spark plug gauge to verify that it matches the manufacturer's specifications.

What happens if you put the wrong spark plug in your lawn mower?

Spark plugs that are gapped incorrectly can cause an engine to miss, or run erratically, especially during idle. The incorrect spark plug gaps can cause uneven firing of individual spark plugs and delay engine combustion; both of which can cause an engine to miss or idle erratically.

Are all spark plugs the same for lawn mowers?

Yes there are different plugs for different engines. Usually you need the engine model on your mower, and take in the old spark plug to the hardware store. Ask for someone to help you find the right spark plug and tell them your engine model and mower model.

What is the difference between RC12YC and rc14yc spark plug?

What is the difference between rc12yc and rc14yc spark plug? The higher number is a slightly hotter spark type plug. The RC14YC4 is now the standard plug for the 990/992 Generac engines. The 999 in the new 16-22kW Evolution (7000 series) units and older 20kW units are still using the cooler RC12YC4 plugs.

How often should a lawn mower spark plug be changed?

every 25 hours

How do I know if my lawn mower spark plug is bad?

Here's How to Know if a Lawn Mower Spark Plug is Bad
  1. You can't get the engine to fire up at all.
  2. You have to tug extra hard for longer than usual on the rewind.
  3. Your lawn mower loses power while moving.
  4. The gas runs out quicker than it used to.

What are the symptoms of a faulty spark plug?

What are the signs your Spark Plugs are failing?
  • Engine has a rough idle. If your Spark Plugs are failing your engine will sound rough and jittery when running at idle. ...
  • Trouble starting. Car won't start and you're late for work… Flat battery? ...
  • Engine misfiring. ...
  • Engine surging. ...
  • High fuel consumption. ...
  • Lack of acceleration.

What do I GAP my spark plugs at?

Usually .035" is around the best gap, even though many instruction manuals say to open your gap to . 045". Go ahead and try that, but when it doesn't run as good, or it drops cylinders at high RPM because that wider / weaker spark can't light the cylinders consistently, you'll know why.
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About The Author

Dennis Walden

Dennis owns a small farm and loves to grill since his early childhood. He’s a professional cook, but hiking and enjoying the great outdoors is his no less favorite part of life.

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