2004 Yamaha Motorsports Grizzly 660 Auto. 4x4 Owners Manual - Page 143
2004 Yamaha Motorsports Grizzly 660 Auto. 4x4 Manual
Page 143 highlights
Inspection The spark plug is an important engine component and is easy to inspect. The condition of the spark plug can indicate the condition of the engine. The ideal color on the white insulator around the center electrode is a mediumto-light tan color for a ATV that is being ridden normally. Do not attempt to diagnose such problems yourself. Instead, take the ATV to a Yamaha dealer. You should periodically remove and inspect the spark plug because heat and deposits will cause the spark plug to slowly break down and erode. If electrode erosion becomes excessive, or if carbon and other deposits are excessive, you should replace the spark plug with the specified plug. Specified spark plug: DPR8EA-9 (NGK) 8-28
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8-28
Inspection
The spark plug is an important engine compo-
nent and is easy to inspect. The condition of
the spark plug can indicate the condition of
the engine. The ideal color on the white insu-
lator around the center electrode is a medium-
to-light tan color for a ATV that is being ridden
normally. Do not attempt to diagnose such
problems yourself. Instead, take the ATV to a
Yamaha dealer. You should periodically re-
move and inspect the spark plug because
heat and deposits will cause the spark plug to
slowly break down and erode. If electrode
erosion becomes excessive, or if carbon and
other deposits are excessive, you should re-
place the spark plug with the specified plug.
Specified spark plug:
DPR8EA-9 (NGK)