Table 5-3. Direct and General Support Maintenance Troubleshooting (Continued)
TEST OR INSPECTION
THE ENGINE IS HARD TO START (Continued)
Set the choke wide open. Remove the air cleaner if necessary.
Crank the engine by hand counterclockwise (left: opposite to normal rotation).
Take eight to ten compression readings.
The first few turns of the engine, the compression may be as low as 30 psi. After the seventh
turn, the compression should be 90 psi.
If the compression is less than 90 psi, replace the engine.
5. ENGINE STOPS SUDDENLY
Check the engine crankshaft. Push the start button.
If the engine turns over freely, go to Step 2.
If the engine struggles to turn over and sounds sluggish, go to Step 2.
If the engine makes a lot of noise like rubbing or rattling metal, replace it.
If the engine will not turn over and is frozen, replace the engine. Figure 5-95. Spark Test
Figure 5-95. Spark Test
Make sure there is spark to the spark plug.
Make sure the ignition switch is turned OFF.
Remove the spark plug wire from the spark plug.
Turn the ignition switch ON.
DO NOT hold the spark plug wire in your bare hands while testing for spark. You can be severely