Qlink RD400 User Manual page 120

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 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.
USER'S MANUAL
Instead, take theATVto aATV 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)
Installation
1. Measure the electrode gap with a wire thick-ness
gauge and, if necessary, adjust the gap to
specification.
Spark plug gap:
0.6 0.7 mm (0.02 0.03 in)
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