Spark Plug Inspection And Replacement - Mercury 25 EFI Service Manual

Hide thumbs Also See for 25 EFI:

Table of Contents

Open the fuse holder and look at the silver colored band inside the fuse. If band is broken, replace the fuse. Replace fuse with

a new fuse with the same rating.

Spark Plug Inspection and Replacement

Damaged spark plug boots may emit sparks that can ignite fuel vapors under the engine cowl, resulting in serious injury or

death from a fire or explosion. To avoid damaging the spark plug boots, do not use any sharp object or metal tool to remove

the spark plug boots.

Remove the spark plug leads. Twist the rubber boots slightly and pull off.

Remove the spark plugs to inspect. Replace spark plug if electrode is worn or the insulator is rough, cracked, broken,

blistered, or fouled.

Set the spark plug gap to specifications.

Spark Plug Gap

Before installing spark plugs, clean off any dirt on the spark plug seats. Install plugs finger‑tight, and then tighten to the

specified value.

90-8M0105568 eng MARCH 2016

0.80–0.90 mm (0.031–0.035 in.)

Table of Contents

30 efi 25 efi jet