Starting and Ignition WM 80 repair
38 wc_tx000521gb.fm
4.8 Checking Spark
Remove the spark plug and inspect the electrode and insulator for
damage. Also check electrode for proper gap. See section Tune-up
Specifications. Return the spark plug to the cylinder before checking
for spark.
Do not check for spark with the spark plug removed. Fuel could squirt
out of the spark plug opening.
Do not touch or lean against the engine when checking for spark.
Touching or leaning against engine when checking spark can result in
electric shock.
Do not check for spark near flammable gases, liquids, or materials.
The spark may ignite them.
4.8.1 To check for spark, carry out the following procedures:
4.8.2 Unscrew the cap from the end of the ignition cable and insert a short
length of stiff, bare wire into the cable and allow it to extend slightly
from the end.
4.8.3 Hold the ignition cable with the bare wire approximately 3 mm (1/8-
inch) from the engine cylinder and pull the rope on the rewind starter.
4.8.4 If a strong blue spark is observed, the ignition module is satisfactory
and either the spark plug or the connection in the cap is faulty.
4.8.5 If no spark is observed, remove the engine hood and disconnect the
wire from the stop switch. Also check the air gap in module. Check for
spark in same manner as before. Make sure the ground wire does not
touch the engine.
4.8.6 If spark occurs with switch disconnected, the switch is defective. If
spark is still not present, the ignition module or wires are faulty.
Note: Checking for spark does not always provide a reliable test of the
ignition system. A weak ignition module may generate sufficient
voltage to fire the plug when removed from the cylinder but not enough
when it is under compression in the cylinder.
Lack of spark may not be the result of a faulty ignition module. Before
replacing the ignition module, check for:
• Bad or fouled spark plug
• Metal connector in spark plug cap corroded or broken
• Broken, frayed, or shorted ignition wire or ground lead
WARNING
WARNING
WARNING
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