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.
Put lawnmower with carburetor side up removed 6 screws securing baffle. Removed baffle, blade, blade adapter, blade driver. Removed belt guard. Next I disconnected the cable to the transmission bracket. Then I put the mower upright again lifted the rear to about 4 inches and set it on wooden block for support removed the 2 rear wheels. Next I used snap ring pliers to remove the 2 retaining rings securing the pinion gears.then I put the mower back on its left side again to remove the 2 bolts holding the transmission rod to the lawnmower deck next I pulled whole transmission unit from deck replaced with new transmission, 2 pinion gears, retaining rings, washers and a new drive belt using the reverse procedure .