Table 5-3. Direct and General Support Maintenance Troubleshooting (Continued)
TEST OR INSPECTION
ENGINE BACKFIRES (Continued)
Loosen the point gap adjustment screw and place an 0.020 inch (0.52 mm) feeler gage between
Tighten the adjusting screw after setting the gap.
Replace the breaker point cover and go to Step 1e.
Start the engine.
If the engine starts the problem is solved.
If the engine does not start, go to Step 2.
Check the engine compression.
Because automatic compression release engines release compression at
600 rpm, there is a different compression test procedure for this engine.
Start the engine and run it for fifteen minutes.
Shut off the engine and remove the spark plug.
BE CAREFUL when removing the spark plug. Too much force can break the insulator.
Figure 5-187. Spark Plug Cleaning and Removal