This video shows the systematic method of diagnosing a small 4stroke engine, like a lawn mower or go cart engine. Thanks to subscriber Rein Ciarfella for the easy to remember acronym FACTS that stands for Fuel Air Compression Timing and Spark. Use that as a checklist in any order to go about diagnosing and fixing the problem.

For this engine, I truly did not know what the problem was. But compression was the culprit, so I had to figure out why a new engine had none. The fix was simple after eliminating other possibilities.

Watch as I go through the steps and get this one back up and running!

The video about Diagnosing and Replacing a Bent Woodruff Key is at    • Diagnosing and Replacing a Bent Woodr...  .