Yamaha F2.5C, Service Manual

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6D55F11
3-6
1
2
3
4
5
6
7
8
9
NOTE:
The valve system of this model will not be
damaged even if the timing belt breaks.
Checking the spark plugs
1. Disconnect the spark plug caps, and then
remove the spark plugs.
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.
5. Install the spark plugs, tighten them fin-
ger tight, then to the specified torque
using a spark plug wrench.
Checking the thermostat
1. Remove the cover
1
and thermostat
2
.
2. Suspend the thermostat in a container of
water.
3. Place a thermometer in the water and
slowly heat the water.
Timing belt slack
a
:
Within 13 mm (0.5 in)
Specified spark plug:
DPR6EA-9 (NGK)
Spark plug gap
a
:
0.8–0.9 mm (0.031–0.035 in)
T
R
.
.
Spark plug:
17 N·m (1.7 kgf·m, 12.5 ft·lb)
S69J5E40
Power unit