BLOG The DIY Guide to Ignition System Repairs for Small Engines Sep 30, 2024

If you own a small engine, such as those found in lawn mowers, snow blowers, or chainsaws, you may encounter ignition system issues from time to time. While it can be tempting to take your small engine to a professional for repairs, there are many DIY fixes you can try first. In this guide, we will walk you through the steps to troubleshoot and repair common ignition system problems in small engines.

Before we begin, it's important to note that small engine ignition systems can vary depending on the make and model of your equipment. Always refer to your owner's manual for specific instructions and diagrams. Additionally, make sure to wear appropriate safety gear, such as gloves and protective eyewear, when working on your small engine.

Step 1: Check the Spark Plug The spark plug is a crucial component of the ignition system that ignites the air-fuel mixture in the engine cylinder. Start by removing the spark plug with a spark plug wrench and inspecting it for signs of wear or damage. If the electrode is worn or covered in carbon deposits, replace the spark plug with a new one.

Step 2: Test the Ignition Coil The ignition coil is responsible for generating the electrical current needed to create a spark in the spark plug. To test the ignition coil, use a multimeter to measure the resistance of the coil. If the resistance is outside the manufacturer's specifications, replace the ignition coil.

Step 3: Check the Ignition Switch If your small engine is not starting, the ignition switch may be faulty. Test the ignition switch with a multimeter to ensure that it is allowing electrical current to pass through when the key is turned. If the ignition switch is not functioning properly, replace it.

Step 4: Inspect the Flywheel Key The flywheel key holds the flywheel in place on the crankshaft and is essential for proper engine timing. If the flywheel key is damaged or sheared, the engine may not start. Inspect the flywheel key for signs of wear or damage and replace it if necessary.

Step 5: Clean or Replace the Magnetron The magnetron is a small component that generates electrical pulses to trigger the ignition coil. If the magnetron is dirty or damaged, it may not function correctly. Remove the magnetron and clean it with a soft brush or replace it with a new one.

By following these steps, you can troubleshoot and repair ignition system issues in your small engine. However, if you are unsure about any of the steps or if the problem persists, it may be best to consult a professional small engine repair technician. Remember to always prioritize safety and take precautions when working on your small engine ignition system. With a little knowledge and effort, you can keep your small engine running smoothly for years to come.