How do you change a spark plug on a lawnmower?


If your lawnmower is running rough or is hard to start, it is likely that the spark plug is bad. Use a spark plug wrench to replace the plug in a few minutes.

  1. Remove the plug wire

    Most mowers use plug wires that attach through a round metal cylinder that fits over the metal end of the plug. Pull the wire straight out from the engine to remove the electrode.

  2. Clean around the plug

    Prevent debris from falling into the hole by using a small brush to sweep it away before removing the plug.

  3. Remove the plug

    Generally, plugs require a 13/16-inch or a 3/4-inch wrench. Place the wrench over the plug, and turn counterclockwise to loosen and remove it.

  4. Inspect the plug

    Replace the plug if it has broken porcelain or a burned electrode. Change the plug at the beginning of each mowing season or after every 100 hours of use.

  5. Check the gap

    Use a wire feeler gauge to check the plug gap. Most small engines require a 0.3-inch gap. You should feel a slight drag as you pull the wire through the plug gap. Use the prongs on the feeler gauge to adjust the electrode if necessary.

  6. Replace the plug

    Insert the new plug into the hole and turn clockwise to tighten. Once the plug becomes snug, tighten another one-quarter turn. Push the plug wire onto the plug.

Q&A Related to "How do you change a spark plug on a lawnmower?"
1. Pull off the metal loop on the tip of the spark plug to disconnect the engine wire. 2. Slip the spark plug socket over the end of the plug. A 5/8-inch socket is common but not
its a 5/8 deep socket ,you pull the rubber connector off slowly and turn the plug to the left. auto zone or walmarts sell lawn mower plugs. you may want to check the gap on the old
Before changing your spark plugs, you should make sure to buy the proper plugs for your car. It is best to spend a little more for the better performing ones. You will need to buy
It's gotten a little more complicated to learn how to change spark plugs. Older vehicles still use spark plug wires. Newer cars feature the wasted spark system, which uses one coil
Explore this Topic
The lawn mower spark plug gap is the measurement of how much you have to tighten the spark plug into the socket. Each lawnmower engine type is going to have a ...
You will know that the spark plugs needs changing when there is a rough engine idle, an engine miss, engine hesitation, engine surging and reduced engine power ...
The Kia Sportage spark plug location is confusing if you have never had to change the spark plugs on this vehicle before. The first thing to do when you are trying ...
About -  Privacy -  Careers -  Ask Blog -  Mobile -  Help -  Feedback  -  Sitemap  © 2014