Spark Plug Inspection - Yamaha Diversion XJ600N Owner's Manual

To install
1. Place in the original position and
install the screws.
2. Install the seat.
PERIODIC MAINTENANCE AND MINOR REPAIR
a. Spark plug gap

Spark plug inspection

The spark plug is an important engine
component and should be inspected
periodically, preferably by a Yamaha
dealer. The condition of the spark plug
can indicate the condition of the en-
gine.
Normally, all spark plugs from the
same engine should have the same
color on the white insulator around the
center electrode. The ideal color at this
point is a medium-to-light tan color for a
motorcycle that is being ridden normal-
ly. If one spark plug shows a distinctly
different color, there could be some-
thing wrong with the engine.
6-6
Do not attempt to diagnose such prob-
lems yourself. Instead, take the motor-
cycle to a Yamaha dealer. The spark
plugs should be periodically removed
and inspected because heat and de-
posits will cause any spark plug to
slowly break down and erode. If elec-
trode erosion becomes excessive, or if
carbon and other deposits are exces-
sive, the spark plug should be replaced
EAU01880
with the specified plug.
Specified spark plug:
CR8E (NGK) or
U24ESR-N(DENSO)
Before installing any spark plug, mea-
sure the electrode gap with a wire
thickness gauge and adjust it to speci-
fication.
Spark plug gap:
0.7 ~ 0.8 mm