2000 Yamaha Motorsports Big Bear 400 Owners Manual - Page 119
2000 Yamaha Motorsports Big Bear 400 Manual
Page 119 highlights
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 8-11
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