8-16
8
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.
2. Check the spark plug for electrode erosion
and excessive carbon or other deposits, and
replace it if necessary.
To install the spark plug
1. Measure the spark plug gap with a wire thick-
ness gauge and, if necessary, adjust the gap
to specification.
1. Spark plug wrench
Specified spark plug:
NGK/DR8EA
Spark plug gap:
0.6–0.7 mm (0.024–0.028 in)
U3C263E0.book Page 16 Thursday, May 15, 2008 10:44 AM
Summary of Contents for WOLVERINE 450 YFM45FXY
Page 2: ...PRINTED IN USA 2008 05 0 3 1 CR E F S YAMAHA MOTOR CO LTD DIC183 ...
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Page 52: ...7 1 7 EBU21141 RIDING YOUR ATV U3C263E0 book Page 1 Thursday May 15 2008 10 44 AM ...
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