Checking The Spark Plug - Yamaha NEO'S YN50FU Owner's Manual

1. Screw
1. Panel A
To install the panel
Place the panel in the original posi-
tion, and then install the screw.
PERIODIC MAINTENANCE AND ADJUSTMENT

Checking the spark plug

The spark plug is an important engine
component, which is easy to check.
Since heat and deposits will cause
any spark plug to slowly erode, the
spark plug should be removed and
checked in accordance with the
periodic maintenance and lubrication
chart. In addition, the condition of the
spark plug can reveal the condition of
the engine.
To remove the spark plug
1. Remove panel A. (See page 6-6).
2. Remove the spark plug cap.
1. Spark plug cap
6-7
EAUS1760 3. Remove the spark plug as
shown, with a spark plug wrench
available at a Yamaha dealer.
1. Spark plug wrench
To check the spark plug
Check that the porcelain insulator
around the center electrode of the
spark plug is a medium-to-light tan
(the ideal color when the vehicle is
ridden normally).
TIP
If the spark plug shows a distinctly
different color, the engine could be
operating improperly. Do not attempt
to diagnose such problems yourself.
Instead, have a Yamaha dealer check
the vehicle.
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