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Can spark plugs cause a lawnmower not start?

Dennis WaldenSep 13, 2021

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. For a few dollars, this easy fix can get your small engine working again.

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Just so, 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.
Also know, why is my lawn mower turning over but not starting? The most common reason for why your riding mower will turn over but not start is likely due to bad gas or a dirty carburetor. You can usually fix the problem by removing and cleaning out the carburetor and making sure that your gas is fresh. There are carb cleaners you can purchase to help you with this.

One may also ask, what does it mean when I can't get a spark on a lawn mower?

If you don't see a spark on the tester, there may be a problem with the ignition coil of the flywheel to which it's attached. The ignition coil doesn't frequently develop problems, but the connection between the flywheel and coil or between the starting pulley and flywheel can wear out, and the coil may not be turning.

What do you do if your lawnmower won't start?

Your Mower Won't Start:

  1. Loose, Dirty or Disconnected Spark Plug in Your Lawn Mower: Check it out, clean off debris, re-connect and tighten.
  2. Dirty Air Filter: Clean or replace.
  3. Fuel Not Reaching the Engine: Tap the side of the carburetor to help the flow of gas. If this doesn't work, you might need a new fuel filter.

How do you start a lawn mower that won't start?

If you run into problems getting your lawnmower ready for spring, try the following:
  1. Use fresh gas. Old gasoline can cause starting difficulties. ...
  2. Check the spark plug. ...
  3. Use the choke. ...
  4. Prime the mower. ...
  5. Check the air filter. ...
  6. Check the cables. ...
  7. Check for water in the fuel tank.
  8. Clear the starter cord of blockages.

How do you check a spark plug without a tester?

Will any spark plug work in a lawn mower?

The spark plugs in both types of engine work on the same basic principle. ... Some automotive and lawn mower spark plugs may be interchangeable, but many others are not because of physical differences.

How do you check a spark plug on a lawn mower?

Can a dirty air filter cause a lawn mower not to start?

Dirty or Clogged Air Filter

Before the incoming air enters the carburetor, it passes through an air filter to remove dust and dirt. When the filter is doing its job, it may get clogged up with debris removed from the air and not allow a sufficient amount of air into the carburetor and prevent the engine from starting.

How do I know if my fuel solenoid is bad?

Will lawn mower not start if oil is low?

Does a lawn mower start with a little oil? Check that mowers with engine oil levels are generally delivered without oil and that some mowers are equipped with a low oil safety switch. This means that the mower will not start if the oil level is low. Then check the oil level, the average lawnmower will drain it.
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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.