Spark Plug Inspection - Yamaha ULTRAMATIC GRIZZLY 660 YFM660FS Owner's Manual

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

Spark plug inspection

Removal
1. Remove panel A. (See pages 8-17–8-19 for
panel removal and installation procedures.)
2. Remove the spark plug cap.
3. Use the spark plug wrench in the tool kit to re-
move the spark plug as shown.
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 medium-to-light tan color for a
ATV that is being ridden normally.
8-71
EBU00864