Complete Small Engine Repair Guide

Comprehensive Guides
T
Tom Bradley
Certified Small Engine Mechanic, 25+ Years Experience
Small engine repair overview
Small engine repair overview

This comprehensive guide covers everything you need to know about small engine repair—from basic troubleshooting to maintenance schedules.

Small Engine Basics

Small engines power lawn mowers, chainsaws, generators, and other outdoor equipment. They’re simpler than automotive engines but require proper care.

The Four Requirements for Running

  1. Fuel - Fresh, properly mixed (for 2-stroke)
  2. Air - Clean filter, proper choke
  3. Spark - Good plug, working ignition
  4. Compression - Sealed combustion chamber

Common Problems and Solutions

ProblemLikely CauseSolution
Won’t startOld fuelDrain, add fresh
Runs roughDirty carburetorClean or rebuild
No sparkBad plugReplace
Dies under loadFuel deliveryCheck filter/carb

Essential Maintenance

  • Before each use: Check oil, inspect for damage
  • Monthly: Check air filter, inspect blade
  • Seasonally: Change oil, replace spark plug
  • Annually: Full service, sharpen blade

Storage Tips

  • Run fuel system dry OR use stabilizer
  • Change oil before storage
  • Store in dry location
  • Maintain battery charge (electric start)