2002 Yamaha Motorsports Big Bear 400 Owners Manual - Page 122

2002 Yamaha Motorsports Big Bear 400 Manual

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EBU00286 Spark plug 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. For example, a very white center electrode porcelain color could indicate an intake air leak or carburetion problem for that cylinder. Do not attempt to diagnose such problems yourself. Instead, take the machine 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, you should replace the spark plug with one of the proper type. Standard spark plug: DR8EA (NGK) Before installing the spark plug, measure the electrode gap with a feeler gauge and adjust to specification. Spark plug gap: 0.6 ~ 0.7 mm (0.024 ~ 0.028 in) a. Spark plug gap When installing the spark plug, always clean the gasket surface and use a new gasket. Wipe off any grime from the threads and tighten to the specified torque. Tightening torque: Spark plug: 17.5 Nm (1.75 m·kgf, 12.5 ft·lb) 8-11

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8-11
EBU00286
Spark plug 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.
For example, a very white center electrode
porcelain color could indicate an intake air
leak or carburetion problem for that cylinder.
Do not attempt to diagnose such problems
yourself.
Instead, take the machine to a Yamaha deal-
er. 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 excessive, you
should replace the spark plug with one of the
proper type.
Before installing the spark plug, measure the
electrode gap with a feeler gauge and adjust
to specification.
a.
Spark plug gap
When installing the spark plug, always clean
the gasket surface and use a new gasket.
Wipe off any grime from the threads and tight-
en to the specified torque.
Standard spark plug:
DR8EA (NGK)
Spark plug gap:
0.6 ~ 0.7 mm (0.024 ~ 0.028 in)
Tightening torque:
Spark plug:
17.5 Nm (1.75 m·kgf, 12.5 ft·lb)