Checking The Thermostat - Yamaha F50F Service Manual

CHK
ADJ
2. Clean the electrodes 1 with a spark plug
cleaner or wire brush. Replace the spark
plug if necessary.
3. Check the electrodes for erosion and
excessive carbon or other deposits, and
the gasket for damage. Replace the
spark plug if necessary.
4. Check the spark plug gap a. Adjust if out
of specification.
Specified spark plug:
DPR6EB-9 (NGK)
Spark plug gap a:
0.8–0.9 mm (0.031–0.035 in)
5. Install the spark plugs, tighten them fin-
ger tight, then to the specified torque
using a spark plug wrench.
Spark plug:
17 N·m (1.7 kgf·m, 12.5 ft·lb)

Checking the thermostat

1. Remove the cover 1, gasket, and ther-
mostat 2.
3-9
Periodic checks and adjustments
2. Suspend the thermostat in a container of
water.
3. Place a thermometer in the water and
slowly heat the water.
4. Check the thermostat valve opening at
the specified
Replace if out of specification.
S69J5E40
water temperatures.
6C13G11