Section 02 TROUBLESHOOTING
Sub-Section 05 (ELECTRICAL SYSTEM)
02-05-7
SYMPTOM ENGINE IS MISFIRING – ERRATIC SPARK AT SPARK PLUG.
CONDITION RIDING ON WET SNOW.
Test / Inspection 1. Verify if spark plug wires and / or spark plug cap seals are sealing-out moisture.
a. Defective wires and / or seals.
Replace defective part.
2. Verify if ignition system wiring harness connectors are in good condition and /
or are sealing-out moisture.
a. Loose connectors, corroded terminals or defective parts.
Clean terminals and apply silicone dielectric grease. Replace defective parts.
CONDITION NORMAL USE.
Test / Inspection 1. Verify misfiring by observing flash of stroboscopic timing light ; unplug connec-
tors between magneto / generator and vehicle wiring harness to isolate prob-
lem. Check condition of connectors.
a. Defective spark plug and / or cables / caps. Defective electrical system wiring har-
ness and / or accessories and / ignition cut-out switches. Condition of connector
terminals.
Replace defective parts and / or repair damaged wires. Replace defective
switch(es). Clean terminals and apply silicone dielectric grease.
CONDITION RIDING IN DEEP AND THICK SNOW.
Test / Inspection 1. Perform all verifications outlined under “Engine does not start – no spark at
spark plug”.
2. Verify spark plug(s). Proceed with spark plug analysis in order to identify source
of problem.
a. Defective and / or worn spark plug(s) and / or cable(s) and / or cap(s).
Replace defective part(s). Proceed with ignition system testing procedures. Per-
form engine analysis.
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