18
IGNITION SYSTEM
CS-370ES
CS-420ES
3-6 Inspecting ignition coil resistance
1. Remove cylinder cover.
2. Connect one probe of Ohm-meter or multimeter
(Power source DC 1.5V) to spark plug cap coil (A).
3. Connect the other probe to cylinder (B) to
measure secondary coil resistance. Secondary
coil resistance should be in the range of 1.5 to 2.2
kΩ.
4. If the meter reading indicates infinite
resistance, remove spark plug cap and spark
plug cap coil, and measure resistance between the
conduction wire of high tension lead and ignition coil
core.
5. If the reading at step 3 or 4 is not in the range of
1.5 to 2.2 kΩ, replace with a new ignition coil (Go to
“3-7 Replacing spark plug cap and coil”).
3-7 Replacing spark plug cap and coil
1. Disconnect spark plug cap (A) from spark plug.
2. Apply some oil in spark plug cap (A) for easy
removal from high tension lead (B).
3. Pull spark plug cap away from high tension lead.
4. Inspect spark plug cap coil (C) for correct
connection and corrosion. Inspect spark plug cap
for cracks. Replace as required.
NOTE: Make sure spark plug cap coil (C) contacts
conductor core of high tension lead when reinstalling
it.
5. Apply oil to spark plug cap (A) and insert high
tension lead (B) as shown until the spark plug cap
coil is properly seated in the cap.
A
A
B
C
B
A
B
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