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SECTION 8
ELECTRICAL SYSTEM AND COMPONENTS
1. Before removing the spark plugs, clean the area
around the base of plugs to keep dirt and debris
out of the engine.
2. Remove the plugs and check condition.
Replace
the plugs if wom or if reuse is questionable.
Use Champion® type RV17YC (or equivalent)
spark plugs.
NOTE:
Do not clean the spark plugs in a machine
using abrasive grit. Some grit could re-
main in spark plugs and enter the engine
causing extensive wear and damage.
3. Check the gaps using a wire feeler gauge. Adjust
gaps to 0.035" (0.89 mm) by carefully bending
the ground electrode.
4. Reinstall the spark plugs Into cylinder heads.
Torque plugs to 10/15 ft. Ib (14/20 Nem).
INSPECTION
Inspect the spark plugs as soon as they are removed
from the cylinder heads. The deposits on the tips are
an indication of the general condition of piston rings,
valves, and carburetor.
Normal and faulty spark plugs are shown in the follow-
ing photos.
Normat: A plug taken from an engine operating under nor-
mal conditions will have light tan or gray colored deposits. If
the center electrode is not worn, a plug in this condition
could be regapped and reused.
Carbon Fouled: Soft, sooty, black deposits indicate incom-
plete combustion. Incomplete combustion is usually caused
by over rich carburetion, weak ignition, or poor
compression.
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