mercury Workshop Repair Guides

Mercury Workshop Service and Repair Manuals

Spark Plug|Specifications|Page 1291 > < Spark Plug|Specifications|Page 1289
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- Rich fuel mixture
- Retarded ignition timing
- Oil in combustion chamber
- Incorrect spark plug gap
- Plug heat range too low
- Excessive idling/low speed running
- Clogged air cleaner element
- Deteriorated ignition coil, coil wire or ignition wires

2. Replace the plug if the center electrode is rounded.

Gapping Spark Plug

3. Adjust the gap with a suitable gapping tool.

Electrode Gap: ......................................................................................................................................................... 0.031 - 0.035 in. (0.8 - 0.9 mm)

Spark Plug|Specifications|Page 1291 > < Spark Plug|Specifications|Page 1289