Checking The Spark Plug - Yamaha XCITY VP250 Owner's Manual

PERIODIC MAINTENANCE AND ADJUSTMENT
To install the cowling
1. Connect the headlight coupler and
the turn signal couplers.
2. Place the cowling in the original
position, and then install the
screws.
Panel A
To remove the panel
1. Open the seat. (See page 3-10.)
2. Remove the screws, and then pull
the panel off as shown.
6
ZAUM0656
1. Screw
2. Panel A
To install the panel
Place the panel in the original position,
and then install the screws.
Panel B
To remove the panel
Remove the screws, and then take the
panel off.
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1 ZAUM0657
1. Screw
2
To install the panel
Place the panel in the original position,
and then install the screws.
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Checking the spark plug

The spark plug is an important engine
component, which should be checked
periodically, preferably by a Yamaha
dealer. Since heat and deposits will
cause any spark plug to slowly erode, it
should be removed and checked in ac-
1
cordance with the periodic mainte-
nance and lubrication chart. In addition,
the condition of the spark plug can re-
veal the condition of the engine.
The porcelain insulator around the cen-
ter electrode of the spark plug should
be a medium-to-light tan (the ideal color
when the vehicle is ridden normally). If
the spark plug shows a distinctly differ-
ent color, the engine could be operating
improperly. Do not attempt to diagnose
such problems yourself. Instead, have
a Yamaha dealer check the vehicle.
If the spark plug shows signs of elec-
trode erosion and excessive carbon or
other deposits, it should be replaced.
6-8
Specified spark plug:
NGK/DPR8EA-9
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