66
When spark plug leads are removed, be sure they
are replaced in the correct firing order (see the
table on the previous page).
•
Avoid abusive handling that could crack the spark plug’s ceramic body.
Damaged spark plugs can emit external sparks that could ignite any fuel
vapors in the engine compartment.
•
Do not operate engine if spark plug boots or high-tension leads are torn
or cracked. This condition could allow external sparks which could ignite
any fuel vapors in the engine compartment, and result in fire or explo-
sion.
Checking and changing spark plugs
1.
Twist and pull only on the spark plug wire boot (pulling on wire may cause
separation of the core of the wire).
2.
Remove spark plugs using a 5/8-inch spark plug socket or a 5/8-inch box
wrench. Use care to avoid cracking the spark plug insulators.
3.
Carefully inspect the insulators and electrodes of all spark plugs.
Replace any spark plug which has a cracked or broken insulator or which
has loose electrodes.
If the insulator is worn away around the center electrode, or the electrodes
are burned or worn, the spark plug is worn out and should be discarded.
Spark plugs that are in good condition, except for carbon or oxide depos-
its, should be thoroughly cleaned and gapped.
The spark plug wires are a special resistance type. The core is carbon-
impregnated linen. This type wire is superior to copper core wire in its resis-
tance to crossfire; however, it is more easily damaged than copper core. For
this reason, pull on the spark plug boots to remove the spark plug wires, rather
than pulling on the wire insulation. If the wire is stretched, the core may be
broken with no evidence of damage on the outer insulation. If the core is
broken, it will cause misfiring. In the case of wire damage, it is necessary to
replace the complete wire assembly since a satisfactory repair cannot be
made.
4.
Clean ignition wires with a cloth moistened in kerosene, and wipe dry. Bend
wires to check for brittle, cracked or loose insulation.
Defective insulation will
permit misfiring, crossfiring, or spark to ground; therefore, defective
wires must be replaced.
5.
If the wires are in good condition, clean any terminals that are corroded and replace any that are broken or dis-
torted. Replace any wires with broken or deteriorated cable nipples or spark plug boots.
6.
Clean spark plugs.
Spark plugs that have carbon or oxide deposits should be cleaned in a blast type spark plug cleaner. Scraping with a
pointed tool will not properly remove the deposits and may damage the insulator. If spark plugs have a wet or oily
deposit, dip them in a decreasing solvent and dry thoroughly with compressed air. Oily plugs will cause the cleaning
compound to pack in the shell. Carefully follow the instructions of the manufacturer of the cleaner being used. Clean
3.0 GS
1
2
3
4
5
6
1
3
5
2
4
6
4.3 GL/Gi
5.0GL/Gi, 5.7 GS/GSi,
7.4 Gi/GSi, 8.2 GSi
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Summary of Contents for 3.0 GS
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