Onan MJA Series Service Manual page 58

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TROUBLE-SROOTING CHART 4 - IGNITION SYSTEM (Cont.)
TROUBLE POSSIBLE CAUSE REMEDY
Burned Spark
Plugs (dry, shiny.
glossy deposits on
insulator or possi -
bly cracked insu ­
lator) (Cont.)
Poorly seated valves.
Improper timing.
Too hot a spark plug.
. Check compression
Sect3.7.2.
Retime the ignition.
Change to coll?er plugs.
Improper plug installation. Be sure seals and
threads ar e clean and
gaskets good, use only
recommended torque.
Compression leakage
Be sure seats, gaskets,
through the spark plug.
are
in
good condition.
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