Is over there no spark in the engine of your lawn mower, eye blower or outdoor power equipment? monitor this overview to test your ignition system - including coil, switch & module - to identify any kind of problems and troubleshoot repairs.

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If you know your certain problem, jump down to the section for step-by-step instructions.

How perform Ignition Systems work-related in small Engines & Lawn Mowers? Servicing Spark Plug difficulties How to test the Ignition Coil in Your little Engine trial and error & replacing a prevent Switch Ignition Module fail how To check the Flywheel & Key

WARNING: constantly read the engine and also equipment manual(s) before starting, operating, or servicing your engine or equipment to avoid an individual injury or home damage. View an authorized dealer or call Briggs & Stratton if you space unsure of any procedure or have added questions. Find all Engine security Warnings

How execute Ignition Systems work-related in small Engines & Lawn Mowers?


The ignition device is the starting system for your small engine. Whether you start the engine v a pull rope or the revolve of a crucial on an electrical start motor, you"re relying top top the ignition mechanism to create a spark within the burning chamber.

Small Engine Ignition Parts

Flywheel v magnetsCoil or ArmaturePush Button beginning or traction Cords (depending on her engine type)Spark Plug LeadSpark Plugs

When you start your lawn mower or little engine, you rotate the flywheel and its magnets pass the coil (or armature). This create a spark. The ignition system works with the timing so the the spark will certainly ignite the air-fuel mixture in the combustion chamber simply as the reaches preferably compression in each engine cycle- thus, maximizing the engine’s power.

Once the engine is running, the flywheel keeps rotating, the magnets keep passing the coil and also the spark plug store firing based upon a specific timing.

Types of Ignition Systems

Solid-state systems: the more modern option, these systems use a small transistor in the coil or armature come close the electric circuit that travels v the spark plug lead to the spark plug(s).Breaker point systems: used on engines made prior to 1980, these equipment use a mechanically switch rather of a transistor come close the electric circuit offered to produce a spark.

Common Flywheel Problems

If you are experiencing ignition time issues, this is most often because of a sheared flywheel key. You can additionally test the flywheel magnets for any potential issues.

For information concerning this, you re welcome visit our Inspecting the Flywheel and key FAQ.

Common Spark Plug Problems

How To check the Ignition Coil in Your little Engine

Safety Warnings: remain clear of any type of rotating, moving parts, or other hazardous locations whenever attempting to begin the engine or equipment.

The coil is most likely the simplest thing to check and therefore the an initial thing to examine when embarking ~ above ignition system troubleshooting.

Testing the Coil or Armature

Step 1: Clip one finish of the spark tester (service part number 19368) come the ignition cable and the other grounded to the cylinder head as shown below.

Step 2: rotate the flywheel swiftly (at the very least 350 RPM) and also watch for spark in the tester window.

If the spark jumps the tester gap, your ignition coil is functioning fine. If not, it requirements to it is in replaced.

Engine quits when running? Hook the tester up in between the ignition cable and the spark plug and start the engine. Once it stops, screen the window.

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Common mistakes When testing Coils

Be certain to unhook the coil indigenous the tools wiring harness and also the engine"s wiring harness and use the spark tester. Many a technician is fooled into replacing a great coil due to the fact that the coil grounding lead to be shorting out versus a piece of paper metal.DO NOT connect the tester come the spark plug because that this test. The engine may start. There is no the grounding lead installed, friend won"t have the ability to turn the off.

Replacing Ignition Coils or Armatures