Mercury 80 Owner's Manual

MAINTENANCE
47
9. Secure propeller nut by bending three of the tabs into the thrust hub grooves.
ob00422
10. Reinstall spark plug leads.
Spark Plug Inspection and Replacement
1. Remove top cowling. Refer to Top Cowl Removal and Installation.
2. Disconnect the wiring harness connectors from the pencil coils.
3. Remove the mounting bolts that are securing the pencil coils. Pull the pencil coils from the spark plugs
using a twisting motion.
a
b
d
c
20752
a - Wiring harness connector
b - Pencil coil
c - Bolt
d - Ground strap
4. Remove the spark plugs to inspect. Replace spark plug if electrode is worn, threads of seal area are
corroded, or the insulator is rough, cracked, broken, blistered or fouled.
20753
5. Set the spark plug gap to specifications.

Mercury 80 Specifications

General

Steering	Remote
Shaft Length	20 in (508 mm)
Gear Ratio	2.07:1
Horsepower	80 hp
Full Throttle RPM Range	5000-6000 RPM
Bore x Stroke	3.15 x 3.15 in (80 x 80 mm)