Checking The Spark Plugs - Yamaha F15B Service Manual

2. Check the timing mark aligned, then
install the new timing belt carefully on to
the sprockets.
66M
1
NOTE:
First install the drive sprocket side 1, then
install the driven sprocket side 2.
cC
Do not turn the drive sprocket or the dri-
ven sprocket when the timing belt is not
installed. Otherwise the piston and valves
will interfere with each other and be dam-
aged.

Checking the spark plugs

1. Remove the Spark plug caps, then
remove the spark plugs.
2. Clean the electrodes 1 with a spark plug
cleaner or wire brush. Replace the spark
plug if necessary.
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3. Check the electrodes for erosion and
4. Check the spark plug gap a. Adjust if out
2
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5. Install the spark plug, tighten it finger tight
1
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excessive carbon or other deposits, and
the gasket for damage. Replace the
spark plug if necessary.
of specification.
Specified spark plug:
DPR6EA-9 (NGK)
Spark plug gap a:
0.8–0.9 mm (0.031–0.035 in)
b, then to the specified torque with a
spark plug wrench c.
c
Spark plug:
18 N·m (1.8 kgf·m, 13 ft·lb)
Power unit
1
2
3
a
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4
5
6
7
b
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8
9
3-6