Yamaha F90D - Checking the Thermostat

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