1983 Yamaha 30EN Outboards Service Manual, Page 168Get this manual

1983 Yamaha 30EN Outboards Service Manual, Page 168

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ENGINE TURNS OVER BUT STALLSENGINE RUNS IRREGULARLY, STOPS OR IDLES ROUGHLY FUEL
Spark plug Spark is weak incorrect gap, Carbon deposits, dirtyCOl unit Defective, Check resistance Ignition timin