Spark Plugs - Yamaha Royal Star XVZ1300A Owner's Manual

1. Spark plug cap

Spark plugs

Removal
1. Remove the spark plug cap.
PERIODIC MAINTENANCE AND MINOR REPAIR
1. Spark plug wrench
2. Use the spark plug wrench in the
EAU01485
tool kit to remove the spark plug as
shown.
Inspection
The spark plug is an important engine
component and is easy to inspect. The
condition of the spark plug can indicate
the condition of the engine. Normally,
all spark plugs from the same engine
should have the same color on the
white insulator around the center elec-
trode. The ideal color at this point is a
medium-to-light tan color for a motor-
cycle that is being ridden normally. If
one spark plug shows a distinctly differ-
ent color, there could be something
wrong with the engine. Do not attempt
to diagnose such problems yourself. In-
stead, take the motorcycle to a
Yamaha dealer. You should periodical-
ly remove and inspect the spark plugs
because heat and deposits will cause
any spark plug to slowly break down
and erode. If electrode erosion be-
comes excessive, or if carbon and oth-
er deposits are excessive, you should
replace the spark plug with the speci-
fied plug.
6-6
Specified spark plug:
DPR7EA-9/NGK or
X22EPR-U9/DENSO
6