Small Engine Troubleshooting: Fix Your Lawn Mower, Chain Saw, or Leaf Blower

If you're an absolute beginner, learn how to diagnose common small-engine problems and fix the ones you can, including what to do if you have a broken crank rope.



spark plug hooks diagram compressed
Spark plug hooks in the Tecumseh (L) and Briggs (R) engines.
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With a little know-how, you can soon learn how to diagnose and fix common problems with your lawn mower's engine.
PHOTO: WILLIAM WALDRON
testing a spark plug diagram
Testing a spark plug.
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Gapping a Spark Plug Diagram
Gapping a spark plug.
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electronic ignition flywheel diagram
The electronic ignition is a little plastic-enclosed box or disk almost touching the flywheel.
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freeing a flywheel diagram
Freeing a flywheel.
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locking a flywheel diagram
Locking a flywheel.
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gapping a CDI diagram
Gapping a CDI feeler gauge.
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points and condenser diagram
Points and condenser.
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Tecumsah float bowl diagram
Tecumseh float bowl.
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shaft key diagram
The shaft key is a little rectangular or half-moon metal piece that aligns the flywheel on the crankshaft.
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Briggs clog spots diagram
Briggs engine clog spots.
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cleaning an air filter diagram
Cleaning an air filter.
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rigging the governor diagram
Rigging the governor.
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Tecumsah float valve
Tecumseh float valve.
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holding the choke open diagram
Holding the choke open.
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sheared shaft keys diagram
Sheared shaft keys.
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