2003 Yamaha Motorsports Vino Classic Owners Manual - Page 44

2003 Yamaha Motorsports Vino Classic Manual

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PERIODIC MAINTENANCE AND MINOR REPAIR To check the spark plug 1. Check that the porcelain insulator around the center electrode of the spark plug is a medium-tolight tan (the ideal color when the scooter is ridden normally). NOTE: If the spark plug shows a distinctly different color, the engine could be defective. Do not attempt to diagnose such problems yourself. Instead, have a Yamaha dealer check the scooter. 2. Check the spark plug for electrode erosion and excessive carbon or other deposits, and replace it if necessary. Specified spark plug: BPR7HS (NGK) 3. Install the spark plug with the spark plug wrench, and then tighten it to the specified torque. Tightening torque: Spark plug: 20 Nm (2.0 m·kgf, 14 ft·lbf) NOTE: If a torque wrench is not available when installing a spark plug, a good estimate of the correct torque is 1/4-1/2 turn past finger tight. However, the spark plug should be tightened to the specified torque as soon as possible. 4. Install the spark plug cap. a a. Spark plug gap 6 To install the spark plug 1. Measure the spark plug gap with a wire thickness gauge and, if necessary, adjust the gap to specification. Spark plug gap: 0.6-0.7 mm (0.024-0.028 in) 2. Clean the surface of the spark plug gasket and its mating surface, and then wipe off any grime from the spark plug threads. 6-6

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6-6
PERIODIC MAINTENANCE AND MINOR REPAIR
6
To check the spark plug
1. Check that the porcelain insula-
tor around the center electrode
of the spark plug is a medium-to-
light tan (the ideal color when the
scooter is ridden normally).
NOTE:
If the spark plug shows a distinctly
different color, the engine could be
defective. Do not attempt to diagnose
such
problems
yourself.
Instead,
have a Yamaha dealer check the
scooter.
2. Check the spark plug for elec-
trode erosion and excessive car-
bon
or
other
deposits,
and
replace it if necessary.
3. Install the spark plug with the
spark plug wrench, and then
tighten it to the specified torque.
NOTE:
If a torque wrench is not available
when installing a spark plug, a good
estimate of the correct torque is
1/4–1/2
turn
past
finger
tight.
However, the spark plug should be
tightened to the specified torque as
soon as possible.
4.
Install the spark plug cap.
To install the spark plug
1.
Measure the spark plug gap with
a wire thickness gauge and, if
necessary, adjust the gap to
specification.
2. Clean the surface of the spark
plug gasket and its mating sur-
face, and then wipe off any grime
from the spark plug threads.
a
a.
Spark plug gap
Specified spark plug:
BPR7HS (NGK)
Spark plug gap:
0.6–0.7 mm (0.024–0.028 in)
Tightening torque:
Spark plug:
20 Nm (2.0 m·kgf, 14 ft·lbf)