How to Test a Small Engine for Spark
If your small engine isn't starting, you'll need to diagnose many issues including the spark plug. This video walks you through the steps of how to test for a spark using a spark tester.
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Chain oil tank
Take a picture of Chain Saw- This will give you reference to all type of screws and where they go.
Remove Bar & Chain, Remove all screws , remove lock washer on chain gear, unit will open up. Pay attention to two springs concerning the on/off switch. Oil bottle will fall out. When replacing oil bottle be sure tip is properly fitted in slot. Dallas