8-15
8
EBU23221
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 panel A. (See page 8-8.)
2. Remove the spark plug cap.
3. 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).
NOTE:
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
U2C661E0.book Page 15 Thursday, March 16, 2006 10:45 AM
Summary of Contents for GRIZZLY 660 YFM66FGW
Page 1: ...YFM66FGW 2C6 28199 61 OWNER S MANUAL MANUEL DU PROPRIÉTAIRE MANUAL DEL PROPIETARIO ...
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Page 61: ...7 1 7 EBU21141 RIDING YOUR ATV U2C661E0 book Page 1 Thursday March 16 2006 10 45 AM ...
Page 151: ...11 3 11 1 Model label U2C661E0 book Page 3 Thursday March 16 2006 10 45 AM ...
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