Troubleshooting WM 90 Repair
wc_tx000393gb.fm 100
12.2.2 Ignition System Problems:
Check the following when experiencing a lack of spark.
12.2.2.1 Wires of the ignition coil, spark plug, or contact breaker disconnected.
12.2.2.2 Ignition coil damaged or shorted.
12.2.2.3 Spark plug wire wet or soaked with oil.
12.2.2.4 Spark plug dirty or wet.
12.2.2.5 Spark plug gap incorrect.
12.2.2.6 Spark plug electrode connected or bridged.
12.2.2.7 Incorrect spark timing.
12.2.2.8 Proper connection of all wires.
12.2.3 Compression System:
If starting difficulties and loss of power are not due to the fuel system
or ignition system, the fault may be due to lack of compression. Make
the following checks to the compression system.
12.2.3.1 Internal engine is completely dry because of a long period of storage.
12.2.3.2 Loose or broken spark plug. This causes a hissing noise made by the
fuel-air mixture running out of the cylinder in compression stroke
during cranking.
12.2.3.3 Damaged head gasket or loose cylinder head. This will also make a
hissing noise.
12.2.3.4 If the correct compression is not obtained even after remedying the
above, problems may be due to incorrect valve clearance.
Disassemble the engine and proceed further as follows:
• Valve stuck open due to carbon or gum on the valve stem.
• If the piston rings are stuck on the piston, remove the piston and con-
necting rod from the engine. Clean and replace the parts if necessary.
12.2.4 Engine Misfires:
12.2.4.1 Incorrect spark plug electrode gap. Adjust gap.
12.2.4.2 Ignition cable worn.
12.2.4.3 Weak spark.
12.2.4.4 Ignition wire connections loose.
12.2.4.5 Water in gasoline.
12.2.4.6 Insufficient compression.
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