Electrical Systems
7.36
PVL Ignition Troubleshooting -- 1200cc Carbureted Domestic Engine
CAUTION:
S Verify spark plugs are RESISTOR TYPE!
S If the battery voltage is low, cranking RPM will be down. The ignition system may show weak spark with
a plug out of the cylinder, but not spark under compression or it may show no spark at all. Install a charger
on the battery to ensure good cranking RPM.
S Verify the firing order. If the plug leads are all the same length, trim them so they can only be installed
on the correct cylinder .
S Read through the entire procedure before proceeding. Some steps are repeated. The correct sequence
depends on the readings obtained in step one (1).
1. Check continuity from inside spark plug caps to
engine stud.
If reading is OK, proceed to Step 2.
A. If a spark plug lead reads faulty, open the electrical
box and remove the plug wire(s) that are show-
ing incorrect readings.
NOTE: Remove wires by firmly pushing cap in and then
turning.
a. Measure the resistance of the plug wire(s)
without the coil.
+
_
To Coil
ohms
Amp
Engin
e
Groun
d
Ill. 1
####
SPECIFICATIONS: (Ill. 1)
16.5² (424 mm) length wire: 3700 ohms
22²(563 mm) length wire: 4540 ohms
28² (714 mm) length wire: 5190 ohms
Ill. 2
+
_
ohms
Amp
Plug Wire
####
SPECIFICATIONS: (Ill. 2)
16.5² (424 mm) length wire: 2374 ohms
22²(563 mm) length wire: 3153 ohms
28² (714 mm) length wire: 3998 ohms
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