6-9
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
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. Instead,
have a Yamaha dealer check the
motorcycle.
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 pos-
sible.
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:
DPR8EA-9 or
DPR9EA-9 (NGK)
Spark plug gap:
0.8–0.9 mm
Tightening torque:
Spark plug:
17.5 Nm (1.75 m
0
kgf)
4PT-E7 (English) 6/29/01 9:13 AM Page 46
Summary of Contents for XT500E
Page 7: ...4PT E7 English 6 29 01 9 13 AM Page 6 ...
Page 28: ...PRE OPERATION CHECKS Pre operation check list 4 1 4 4PT E7 English 6 29 01 9 13 AM Page 27 ...
Page 81: ...4PT E7 English 6 29 01 9 13 AM Page 80 ...
Page 82: ...MOTORCYCLE CARE AND STORAGE Care 7 1 Storage 7 4 7 4PT E7 English 6 29 01 9 13 AM Page 81 ...