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how to test a chainsaw coil

how to test a chainsaw coil

3 min read 16-01-2025
how to test a chainsaw coil

Chainsaws are powerful tools, but when the engine won't start, the problem often lies within the ignition system. A faulty chainsaw coil is a common culprit. This guide will walk you through how to test a chainsaw coil, helping you diagnose the issue and get your saw running again. Knowing how to test your chainsaw coil can save you time and money on repairs.

Understanding Your Chainsaw's Ignition System

Before diving into testing, it's helpful to understand the basic components. The ignition system in your chainsaw is responsible for creating the spark that ignites the fuel-air mixture. This system typically includes:

  • Coil: This is the part we're focusing on. It transforms low-voltage power into high-voltage sparks.
  • Flywheel Magnet: This spins past the coil, inducing a current.
  • Spark Plug: The spark plug receives the high-voltage spark from the coil and ignites the fuel.
  • Wiring: Connects all components together.

Tools You'll Need

To test your chainsaw coil, you will need a few simple tools:

  • Multimeter: This is essential for testing the coil's resistance. A digital multimeter is recommended for accuracy.
  • Screwdrivers: You'll likely need a screwdriver to remove the flywheel cover and access the coil.
  • Wire Connectors/Jumper Wires: Useful for temporarily bypassing connections during testing.
  • Safety Glasses: Always protect your eyes when working with power tools.

How to Test a Chainsaw Coil: A Step-by-Step Approach

Here's a detailed, step-by-step approach to testing your chainsaw coil:

Step 1: Safety First!

Disconnect the spark plug. This prevents accidental starting and ensures your safety.

Step 2: Access the Coil

Remove the flywheel cover. Consult your chainsaw's manual for instructions specific to your model. This usually involves removing screws or bolts.

Step 3: Prepare Your Multimeter

Set your multimeter to measure resistance (Ohms). The specific setting will depend on your multimeter's model. Typically, this is represented by the omega symbol (Ω).

Step 4: Testing the Coil's Primary Winding

Locate the coil's primary winding terminals. These are usually labeled "P" or have a low-resistance value. Use your multimeter to measure the resistance between these terminals.

  • Consult your chainsaw's manual: The manual will provide the correct resistance range for your coil's primary winding.
  • Resistance Outside the Specified Range: A reading outside the specified range indicates a problem with the primary winding. This usually means the coil needs replacement.

Step 5: Testing the Coil's Secondary Winding

Locate the coil's secondary winding terminals. These are usually labeled "S" or have a high-resistance value. Measure the resistance between these terminals.

  • High Resistance Reading: Expect a significantly higher resistance reading for the secondary winding than the primary winding.
  • Open Circuit: An infinite resistance (OL) reading indicates an open circuit in the secondary winding, requiring coil replacement.

Step 6: Visual Inspection

Carefully inspect the coil for any visible damage. Look for cracks, burns, or other signs of physical damage. Even minor damage can affect performance.

Step 7: Testing Continuity

Test continuity of the coil wires. If the wires are broken or damaged internally this step will help detect it. Connect one lead of the multimeter to each end of the wire being tested. If the multimeter reads 0 ohms the wire is good, if it reads open then the wire is broken and needs replacing.

Step 8: Reassembly

If your coil tests good, reassemble the chainsaw. Make sure all connections are secure and the flywheel cover is properly installed.

Troubleshooting and Additional Tips

  • No Spark After Testing: If your coil tests good but you still have no spark, the problem might lie with the flywheel magnet, spark plug, or wiring. Test these components individually.
  • Always Consult Your Manual: Your chainsaw's owner's manual provides specific instructions and resistance values for your model.
  • Professional Assistance: If you're uncomfortable working with electrical components, it's always best to seek professional help.

By following these steps, you can effectively test your chainsaw coil and diagnose the cause of your engine trouble. Remember safety is paramount; always disconnect the spark plug before working on your chainsaw's ignition system. With a little patience and the right tools, you can get your chainsaw back up and running in no time.

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