Last Updated on December 30, 2022 by Hooria Batool

Checking spark plugs

Before checking the spark plugs, it is essential to with the small engine. If you run out of fuel or have not been correctly maintained, the ignition system may help no longer produce a good spark.

Replacing Spark Plug Wires

First, remove the cap covering the top of the plug coil, then look at your spark plugs. You can tell which one produces more Checking Small Engine Spark Plug.

Traditional spark plugs

Traditional spark plugs have been the opening step in nearly every tune-up. But for some applications, especially outboards and snowmobiles, they are a nuisance to get at. Generally, these days it’s a case of “if it ain’t broke don don’t fix it.” If your engine starts up quickly, smoothly, and has good acceleration, leave things alone.

Checking small engine spark plugs on most power equipment is pretty routine. It will tell you plenty about the condition of your machine and how it performs with little risk involved. For example, if excessive sparking occurs when you turn over the starter but no sustained firing occurs, you know something is wrong with your ignition coil.

Voltage in spark plug

Much voltage is applied to the spark plug itself, and a “hot” plug may also signify a weak spark. The pull on the rewind will feel overpowering, and the engine should die out or lose power. If you can’t correct this by adjusting the rewind, it’s time to replace the spark plugs.

Working of a spark plug

Spark plugs are a crucial component in starting and running any lawnmower. If your lawnmower is not starting, we recommend using this guide to check and replace them as needed. When would I need to replace my spark plug? For best performance and longer life, it’s recommended that you change your spark plug at least once per season (25 hours of use).

However, spark plugs can wear out before either of those milestones depending on how often you use your machine, so if yours look worn or start misfiring or backfiring, replace them sooner than later. Ignoring an expired or weakly performing spark plug will cause problems for your engine down the line, including reduced fuel efficiency or engine performance, loss of power, and even overheating. Replacing your spark plug is easy to do yourself. Just follow this quick guide for how to do it.

How to clean spark plugs?

  • Make sure your lawnmower is excellent before you start working on it. There are two ways to check if your lawnmower is remarkable enough: touch the small metal fins surrounding the cylinder head if they are hot at all, let them sit until they have cooled down, feel around inside the air filter area for warmth. If neither location feels warm, then you’re good to go.
  • Next, move the lawnmower to a clear space with lots of open room around it where you’ll be working. Before you get started, unplug your spark plug wire and set it safely out of the way to avoid accidentally grounding yourself or damaging the engine. If there is already a wrench on your spark plug, loosen it by turning it counterclockwise with your hand.
  • Now, you can remove the old spark plug. Typically, this will involve gripping the top of the old plug with an adjustable wrench and gently pulling up until you can take it off completely. If there is no wrench already on the top of the old plug, use one equal to or larger than 16mm for best results (if using metric).
  • Before inserting a new spark plug into your lawnmower, make sure to inspect it to ensure it’s clean and free of damage. If you see any buckling, cracks, or rust on the outside, throw it out and grab a new one. Also, if your lawnmower was running poorly before the spark plug change, consider removing and reinstalling the old plug as a way to check its condition double. Repeat this whole process from steps 2-4 until you have a new spark plug ready to go in its place.
  • Once you’ve fitted your new spark plug into place, offer it to your engine by hand first. The thread should start at the top of the cylinder head with very little resistance; if there is too much resistance, it likely means that your spark plug will not fit, so try another one. Make sure to not cross-thread your spark plug, which will cause it to bind and strip the threading in the cylinder head, causing a lot of damage.
  • Once you’ve got your new spark plug fitted into place, tighten it up by hand until you start feeling resistance, then give it another 2/3rds of a turn with your adjustable wrench. Be careful when tightening as too much pressure could cause damage to the engine, but don’t worry about avoiding over-tightening if you’ve used a more giant wrench than necessary. No harm will come from being a little loose here so long as there isn’t any play in the plug once installed. Finally, screw on your spark plug wire back onto its post and take a moment to pat yourself on the back before turning your lawnmower back on.

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Common mistakes to avoid when replacing spark plugs

  1. The first mistake people make when replacing their spark plugs is using a wrench that’s too small. This will result in forcing the pin into place, which can cause damage to your engine. Remember that if it’s hard for you to grip and turn by hand, then it’s going to be even more challenging for your machine, so use something at least 16mm across.
  2. Another mistake people make is not ensuring their new spark plug is clean and free of damage before installation. If you see any buckling or rust, throw the old one out and try again. Just repeat this process until you get the perfect result.


Spark plug health is the primary determinant of a car’s performance, as car owners know. Your engine’s performance depends on how well they perform during the ignition process. Maintaining them well and keeping them clean is therefore essential.

Maintaining your spark plugs regularly is essential for preventive maintenance. When you clean and maintain your spark plugs periodically, your engine will perform better, and your plugs’ lifespan will increase. During the inspection, it may be necessary to clean them if you notice rust, carbon, gunk, dust, or any buildup.

Frequently Asked Questions