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Service Manual
TC-355
General Inspection Cont.
Spark Testing
While the rubber spark plug boot / high-tension lead are removed from the
spark plug, this is an ideal time to test the quality of the current being
delivered to the spark plug. Insert a three point spark tester into the spark
plug boot and briskly pull the recoil starter. The tester should reveal a strong
spark with a blue color. Lack of spark, weak spark, or yellow spark may
indicate a problem with another electrical component within the engine.
Ignition Coil Testing
Connect an ohmmeter to the ignition coil with one lead inserted into the spark
plug boot and the other making contact with the cylinder fins of the engine
(as shown).
Secondary resistance, when tested this way, should indicate 4.2 (+/- 1) KΩ.
If the reading is not within this range, replace with a new coil, (previous tests
for spark using a three point tester should have indicated a weak spark or
none at all).
If the reading is within range, and still weak or no spark is evident, replace
the ignition coil.
Fasteners
Check to ensure that all fasteners are tight prior to disassembly.
Loosening of fasteners on the carburetor side may cause erratic running
conditions, or even engine failure.
It’s always best to know if fasteners are properly torqued prior to engine
service, as problematic running conditions may be the result.
Fuel Filter
Using a hooked wire, reach into the filler neck of the fuel tank, and grasp the
fuel line. Gently pull the fuel line, with the fuel filter attached, through the filler
neck. The filter should be white in color and should be compressible between
two fingers. If it appears discolored or hard, replace with a new one.
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