To Check/Install Spark Plug - Yamaha TW200 Owner's Manual

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
motorcycle 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.
have a Yamaha dealer check the
motorcycle.
2. Check the spark plug for elec-
trode erosion and excessive car-
bon or other deposits,
replace it if necessary.
Specified spark plug:
DR8EA (NGK) or
X24ESR-U (DENSO)
PERIODIC MAINTENANCE AND MINOR REPAIR
a
a. Spark plug gap
To install the spark plug
Instead,
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 (0.02–0.03 in)
and
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.
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
However, the spark plug should be
tightened to the specified torque as
soon as possible.
6-10
Tightening torque:
Spark plug:
17.5 Nm
(1.75 m·kg, 12.5 ft·lb)
turn past finger
4. Install the spark plug cap.
1
2
3
4
tight.
5
6
7
8
9