Checking The Thermostat - Yamaha F150A Service Manual

CHK
ADJ
4. Check the spark plug gap a. Adjust if out
of specification.
Specified spark plug:
LFR5A-11 (NGK)
Spark plug gap a:
1.0–1.1 mm (0.039–0.043 in)
5. Install the spark plugs, tighten them fin-
ger tight b, then to the specified torque
using a spark plug wrench c.
Spark plug:
25 N·m (2.5 kgf·m, 18.4 ft·lb)

Checking the thermostat

1. Remove the flywheel magnet cover.
2. Remove the cover 1 and thermostat 2.
2
3-7
Periodic checks and adjustments
1
S63P3110
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
Replace if out of specification.
Water
temperature
58–62 °C
(136–144 °F)
above
70 °C (158 °F)
6. Install the thermostat and cover, and
then tighten the cover bolts to the speci-
fied torques in two stages.
Thermostat cover bolt:
1st: 6 N·m (0.6 kgf·m, 4.4 ft·lb)
2nd: 12 N·m (1.2 kgf·m, 8.9 ft·lb)
S69J5E40
water temperatures.
Valve lift a
0.05 mm
(0.0020 in)
(valve begins to lift)
more than
4.3 mm (0.17 in)
63P3F11