Spark Plug Inspection - Yamaha Big Bear Professional YFM400FW Manual Del Propietário

1. Spark plug cap
1. Capuchon de bougie
1. Tapa de bujía
1. Spark plug wrench
1. Clé à bougie
1. Llave de bujías

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.
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 in-
spect the spark plug because heat and deposits
will cause the spark plug to slowly break down
and erode. If electrode erosion becomes exces-
sive, or if carbon and other deposits are exces-
sive, you should replace the spark plug with
the specified plug.
Specified spark plug:
DR8EA (NGK)
8-37
EBU00680