2006 Yamaha Motorsports Bruin 350 Auto. 4x4 Owners Manual - Page 124

2006 Yamaha Motorsports Bruin 350 Auto. 4x4 Manual

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2. Use the spark plug wrench in the owner's tool kit to remove the spark plug as shown. 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: DR8EA (NGK) 1. Spark plug wrench 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 an ATV that is being ridden normally. Do not attempt to diagnose such problems yourself. Installation 1. Measure the electrode gap with a wire thickness gauge and, if necessary, adjust the gap to specification. Spark plug gap: 0.6-0.7 mm (0.02-0.03 in) 8-18

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8-18
2.
Use the spark plug wrench in the owner’s
tool kit to remove the spark plug as shown.
1.
Spark plug wrench
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 an 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.
Installation
1.
Measure the electrode gap with a wire
thickness gauge and, if necessary, adjust
the gap to specification.
Specified spark plug:
DR8EA (NGK)
Spark plug gap:
0.6–0.7 mm (0.02–0.03 in)