8-9
8
EBU23211
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 accor-
dance with the periodic maintenance and lubrica-
tion chart. In addition, the condition of the spark
plug can reveal the condition of the engine.
To remove the spark plug
1. Remove the spark plug cap.
2. Remove the spark plug as shown, with the
spark plug wrench included in the owner’s tool
kit.
To check the spark plug
1. Check that the porcelain insulator around the
center electrode of the spark plug is a medi-
um-to-light tan (the ideal color when the ATV
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. In-
stead, have a Yamaha dealer check the ATV.
1. Spark plug cap
1. Spark plug wrench
U5YT65E0.book Page 9 Tuesday, March 18, 2008 11:39 AM
Summary of Contents for YFM350RY
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Page 55: ...7 1 7 EBU21141 RIDING YOUR ATV U5YT65E0 book Page 1 Tuesday March 18 2008 11 39 AM ...
Page 131: ...10 5 10 Fuse Fuse 15 0 A U5YT65E0 book Page 5 Tuesday March 18 2008 11 39 AM ...
Page 134: ...11 3 11 1 Model label U5YT65E0 book Page 3 Tuesday March 18 2008 11 39 AM ...
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