2010 Yamaha Motorsports Grizzly 450 4x4 Owners Manual - Page 97

2010 Yamaha Motorsports Grizzly 450 4x4 Manual

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1. Spark plug cap 1. Spark plug wrench 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 medium-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. Instead, have a Yamaha dealer check the ATV. 8 8-15

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8-15
8
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).
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