72
It will be fouled: (A) Oil Fouled.
Wet oil deposits.
Minor electrode wear.
(B) Deposit Fouling.
Red, yellow, brown, and white deposits indicate use
of incorrect oil or high test gas.
A. PLUG APPEARS NORMAL
Check spark with gap tester. Electrodes should be spaced ¼” apart. "Good" spark will easily jump this gap.
WEAK SPARK
(Spark jumps plug gap but not
tester gap)
(1) POINTS
(a) Worn
(b) Incorrectly gapped
(c) Burned
(d) Dirty
(2) CONDENSER:
(a) Defective
(b) Poor solder connection
(3) TIMING:
(a) Advanced
(b) Retarded
(4) COIL:
(a) Defective
(b) Poor connection
(c) Leaking spark plug wire
NO SPARK
(1) Defective Switch
(2) Disconnected Wire
(3) Shorted Condenser
(4) Grounded Points
(5) Defective Coil
(6) Shorted High Tension Wire
STRONG SPARK
(Sharp blue spark easily
jumps gap)
(1) FUEL SYSTEM
(a) MIXTURE
• Carelessly mixed
• Wrong oil
• Stale or ethyl gas
• Incorrect oil pump
adjustment
(b) CARBURETION
• Float level
• Plugged )ets
• Plugged passage
• Float valve
• Idle adjustment
• Needle jet adjustment
(c) ROTARY VALVE
• Broken
• Incorrectly installed
• Altered
• Worn
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