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.
The chainsaw\'s chassis was broken when it was run over by a truck.
All the parts, handles, engine, drive sprocket, bar and chain, etc. had to be removed and replaced. This was a long job, but it didn\'t require any special knowledge or skill because the carburetor and engine came off as a unit and therefore didn't have to be readjusted.
The hardest part was replacing the fuel like through the hole in the chassis into the tank. The seal around the fuel line is accomplished simply by making the line a very tight fit in the hole. It took a lot of effort and patience to jam the line into the hole, but eventually it fit.
The four engine mounting bolts are held in with red loctite, so they were difficult to remove. The old loctite has to be cleaned out of the threads with a wire brush wheel and it has to be replaced with fresh.
Everything else was just a matter of carefully removing the parts from the old broken chassis and reinstalling them on the new one.