Yamaha F90D User Manual

CHK
ADJ
Periodic checks and adjustments
3-7
6D81G11
5. Check the spark plug gap
a
. Adjust if out
of specification.
6. Install the spark plugs, tighten them fin-
ger tight, then to the specified torque
using a spark plug wrench.
7. Install the spark plug wire cover.
Checking the thermostat
1. Remove the flywheel magnet cover.
2. Disconnect the cooling water hose
1
,
and then remove the thermostat cover
2
and thermostat
3
.
3. Suspend the thermostat in a container of
water.
4. Place a thermometer in the water and
slowly heat the water.
5. Check the thermostat valve opening at
the specified water temperatures.
Replace if out of specification.
Specified spark plug:
LFR5A-11 (NGK)
Spark plug gap
a
:
1.0–1.1 mm (0.039–0.043 in)
T
R
.
.
Spark plug:
25 N·m (2.5 kgf·m, 18.4 ft·lb)
T
R
.
.
Spark plug wire cover screw:
4 N·m (0.4 kgf·m, 3.0 ft·lb)
S6D83080
1
2
3
S69J5E40

Yamaha F90D Specifications

General

Fuel Induction System	Electronic Fuel Injection (EFI)
Starting System	Electric
Alternator Output at W.O.T.	35 Amp
Lubrication System	Wet Sump
Full Throttle RPM Range	5000 - 6000 rpm
Steering	Remote
Trim Method	Power Trim and Tilt
Exhaust	Through Propeller
Engine Type	4-Stroke
Displacement	1832 cc
Max Output	90 hp
Recommended Fuel	Regular Unleaded (Minimum Pump Octane 87)
Recommended Engine Oil	Yamalube 4M
Ignition System	TCI
Cooling System	Water Cooled
Shaft Length	L (20"), X (25")