8-10
8
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.
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.
2. Clean the surface of the spark plug gasket
and its mating surface, and then wipe off any
grime from the spark plug threads.
1. Spark plug wrench
Specified spark plug:
NGK/DR7EA
Spark plug gap:
0.6–0.7 mm (0.024–0.028 in)
1. Spark plug gap
U1P012E0.book Page 10 Thursday, April 20, 2006 2:31 PM
Summary of Contents for BIGBEAR 250
Page 1: ...READ THIS MANUAL CAREFULLY It contains important safety information OWNER S MANUAL ...
Page 2: ...EBU17091 U1P012E0 book Page 1 Thursday April 20 2006 2 31 PM ...
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Page 53: ...7 EBU21131 RIDING YOUR ATV U1P012E0 book Page 1 Thursday April 20 2006 2 31 PM ...
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