Yamaha Grizzly 300 Owner's Manual page 82

4. Remove the spark plug as shown, with the
spark plug wrench included in the owner's tool
kit.
8
1. Spark plug wrench
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
1. Spark plug gap
8-10
2. Check the spark plug for electrode erosion
and excessive carbon or other deposits, and
replace it if necessary.
Specified spark plug:
NGK/CR8E
3. Measure the spark plug gap with a wire thick-
ness gauge and, if necessary, adjust the gap
to specification.
1
Spark plug gap:
0.7 - 0.8mm (0.028 - 0.031 in)