How to Fix Your Lawn Mower: Complete Troubleshooting Guide

Lawn mower problems can be frustrating. Learn how to diagnose and fix common lawn mower issues to keep your equipment running smoothly.

1-3 hours
intermediate
year-round

Tools You'll Need

  • Socket set
  • Screwdrivers
  • Pliers
  • Spark plug wrench
  • Air filter

Materials

  • Fresh gasoline
  • Motor oil
  • Spark plug
  • Air filter
  • Carburetor cleaner

Step-by-Step Instructions

1

Diagnose the Problem

Identify the specific issue with your mower. Common problems include won't start, runs poorly, or won't cut properly.

Pro Tips

  • Check for obvious issues
  • Listen for unusual sounds
  • Note specific symptoms
2

Check Basic Maintenance

Check fuel level, oil level, and air filter. Replace dirty air filters and add fresh gasoline if needed.

Pro Tips

  • Check fuel and oil levels
  • Replace dirty air filter
  • Use fresh gasoline
3

Inspect Spark Plug

Remove and inspect the spark plug. Clean or replace if fouled, damaged, or worn.

Pro Tips

  • Check spark plug condition
  • Clean or replace if needed
  • Set proper gap
4

Clean Carburetor

If the mower runs poorly, clean the carburetor. Remove and clean jets and passages with carburetor cleaner.

Pro Tips

  • Remove carburetor carefully
  • Clean all passages
  • Reassemble properly
5

Test and Adjust

Test the mower after repairs. Adjust carburetor settings if needed for optimal performance.

Pro Tips

  • Test mower operation
  • Adjust settings if needed
  • Monitor performance

Frequently Asked Questions

Why won't my lawn mower start?

Common causes include old fuel, dirty air filter, fouled spark plug, or low oil level. Check these items first.

How often should I change the oil?

Change oil every 25-50 hours of use or annually. Check your owner's manual for specific recommendations.

When should I sharpen the blade?

Sharpen the blade when you notice poor cutting performance or ragged grass tips. Typically every 20-25 hours of use.

Can I use ethanol fuel in my mower?

Most modern mowers can handle up to 10% ethanol. Avoid higher ethanol blends as they can damage the engine.

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