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How do I know which spark plug for my lawn mower?

Dennis WaldenSep 13, 2021

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.

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Secondly, what is the gap for lawn mower spark plug?

between 0.028 and 0.031 inches

Likewise, people ask, how do you match spark plugs? Replacement spark plugs must be the same size as the original (same hex size, diameter, thread pitch and length), and have a similar “heat range” (hot enough to resist fouling when the plug is cold, and cool enough to resist pre-ignition when the plug is hot).

Keeping this in consideration, are all spark plugs for lawn mowers the same?

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.

Will a lawn mower start with a bad spark plug?

A dirty or fouled spark plug can cause your lawn mower to not start. It can also work itself loose, causing issues. If the spark plug appears to be seated correctly but the engine doesn't start, a new one may be in order.

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.

Does spark plug gap have to be exact?

The gap between the center and side electrodes of a spark plug must be an exact distance; otherwise, your plugs don't fire efficiently. Adjusting the distance between the two electrodes is called gapping your spark plugs. You need a feeler gauge to gap your spark plugs properly.

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

You can't get the engine to fire up at all.
You have to tug extra hard for longer than usual on the rewind.
Your lawn mower loses power while moving.
The gas runs out quicker than it used to.

What happens when the spark plug gap is too small?

The Spark-Plug Gap

If the gap is too small, the spark will likely be too weak and cause the engine to run poorly or with poor efficiency. ... A spark-plug gap gauge both measures and adjusts the gap and is inexpensive and simple to use.

How do I know if my spark plugs need changing?

What symptoms may indicate my vehicle's spark plugs need replacing?

Rattling, pinging or “knock”-like noises. When spark plugs begin to misfire, you may notice unusual noises from the force of the pistons and combustion not working properly. ...
Hard vehicle start. ...
Reduced performance. ...
Poor fuel economy.

Which type of spark plug is best?

NGK 6619 Iridium IX Spark Plugs snagged the top pick in our spark plug comparison because they offered the best mix of high-performance, fuel efficiency, durability, and dependability. Featuring an iridium construction, these high-quality spark plugs provide a longer lifespan than copper and platinum spark plugs.

Does it matter what kind of spark plugs you use?

The most important detail in a spark plug is matching your engine's design. Copper has high conductivity and low price, but also a shorter lifespan. Harder platinum and iridium cost more, but were designed to last longer, but remember, the best fit is always the one designed for your engine.

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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.