8-15
EBU00680
Spark plug inspection
Removal
1. Remove the spark plug cap.
2. Use the spark plug wrench in the tool kit
to remove the spark plug as shown.
a. Spark plug cap
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 insulator 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 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 ex-
cessive, or if carbon and other deposits are
excessive, you should replace the spark plug
with the specified plug.
Specified spark plug:
DPR8EA-9 (NGK)
Summary of Contents for RAPTOR YFM660RP
Page 2: ...EBU00776 ...
Page 10: ...1 1 EBU00464 LOCATION OF THE WARNING AND SPECIFICATION LABELS ...
Page 12: ...1 3 3 4 5 ...
Page 69: ...7 1 7 1 Riding Your ATV ...
Page 70: ...7 2 ...
Page 99: ...7 31 ...
Page 105: ...7 37 ...
Page 172: ...13 1 EBU00432 YAMAHA MOTOR CORPORATION U S A ATV LIMITED WARRANTY ...
Page 173: ...13 2 1 2 3 4 5 6 7 8 9 10 11 12 13 14 ...
Page 174: ...14 1 EBU00435 YAMAHA EXTENDED SERVICE Y E S ...
Page 175: ...14 2 1 2 3 4 5 6 7 8 9 10 11 12 13 14 ...
Page 177: ...14 5 EBU00437 ...
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