6-2
TESTING PROCEDURE
1. Check for spark using an ignition tester and following
the tester’s recommended procedure. NOTE: The
ignition will have spark even with a sheared key, but
the timing will not be correct.
CAUTION: KEEP ALL COMBUSTIVE SOURCES
AWAY. AVOID THE SPRAY FROM THE SPARK
PLUG HOLE WHEN CRANKING THE ENGINE
OVER AND MAKE SURE THE PLUG WIRES
ARE PROPERLY GROUNDED TO THE
DEDICATED RETAINING POSTS.
2. Check the spark plugs for proper reach, cracks in
the porcelain, pitted or burned electrodes, excessive
carbon buildup, and proper .030" (.762 mm) air gap
setting. Replace if questionable. Attempt to start and
run the engine. If the engine will not start or run
properly proceed to step #3.
3. Attach the spark plug wire(s) to an ignition tester
and ground the tester(s) as in step #1. Remove the
blower housing, disconnect the ignition grounding
leads at the ignition modules. Reinstall the blower
housing for safety and crank the engine over. If spark
occurs, check the ignition switch, safety interlock
switches, or electrical wiring for shorting to ground.
4. Check the air gap between the flywheel magnets
and the laminations of the ignition modules. It should
be .0125" (.3175 mm) use gauge part 670297.
(Illust. 6-3)
5. Check the flywheel magnets for the proper strength.
Hold a screwdriver at the extreme end of the handle
with the blade down, move the blade to within 3/4
inch (19.05 mm) of the magnets. If the screwdriver
blade is attracted to the magnets, the magnetic
strength is satisfactory. (Illust. 6-4)
6. Examine the ignition modules and lamination
assembly for cracks in the insulation or other
damage, which would cause shorts or leakage of
current.
7. Check the operation of the ignition module using an
approved tester following the instructions furnished
with the test unit.
Ignition modules are permanently attached to the
lamination and must be serviced as an assembly.
6-3
6-4
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