Mercury 25 Jet FourStroke - Troubleshooting; Engine Will Not Start

1. Remove the spark plug leads. Twist the rubber boots slightly and pull off.
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2. Remove the spark plugs to inspect. Replace spark plug if electrode is
worn or the insulator is rough, cracked, broken, blistered, or fouled.
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3. Set the spark plug gap to specifications.
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Spark Plug Gap
Spark plug 0.80–0.90 mm (0.031–0.035 in.)
4. Before installing spark plugs, clean off any dirt on the spark plug seats.
Install plugs finger‑tight, and then tighten to the specified value.
Description
Nm lb‑in. lb‑ft
Spark plug 20 177 –
Fuse Replacement ‑ Electric Start Models
IMPORTANT: Always carry spare SFE 20 amp fuses.
The electric starting circuit is protected from overload by an SFE 20 amp fuse.
If the fuse is blown, the electric starter motor will not operate. Try to locate and
correct the cause of the overload. If the cause is not found, the fuse may blow
again.
MAINTENANCE
64 eng