SYMPTOMS: ENGINE TOO RICH.
a. PERFORMANCE IS FLAT, NOT CRISP.
b. CONDITION IS WORSE WHEN ENGINE IS HOT.
c. CONDITION IS WORSE WHEN THE CHOKE/
STARTER IS USED.
d. DARK,FOULED SPARK PLUG.
e. REMOVAL OF AIR CLEANER HELPS.
f. EXHAUST POPPING OR BACKFIRE.
g. ENGINE SOUND IS DULL.
SYMPTOMS: ENGINE IS TOO LEAN.
a. ACCELERATION POOR, SURGING.
b. PERFORMANCE IMPROVES SLIGHTLY AS
ENGINE WARMS.
c. BETTER PERFORMANCE WHEN CHOKE/
STARTER IS USED.
d. NO COLOR, OVERHEATED SPARK PLUG
ELECTRODE.
f. POPPING BACK THOUGH CARBURATOR.
g. ENGINE PINS OR KNOCKS, EXCESSIVE
ENGINE HEAT.
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