2008 Yamaha Motorsports Big Bear 250 Owners Manual - Page 96
2008 Yamaha Motorsports Big Bear 250 Manual
Page 96 highlights
Specified spark plug: NGK/DR7EA To install the spark plug 1. Measure the spark plug gap with a wire thickness gauge and, if necessary, adjust the gap to specification. Spark plug gap: 0.6-0.7 mm (0.024-0.028 in) 1. Spark plug wrench 8 To check the spark plug 1. Check that the porcelain insulator around the center electrode of the spark plug is a medium-to-light tan (the ideal color when the ATV is ridden normally). NOTE: If the spark plug shows a distinctly different color, the engine could be operating improperly. Do not attempt to diagnose such problems yourself. Instead, have a Yamaha dealer check the ATV. 2. Check the spark plug for electrode erosion and excessive carbon or other deposits, and replace it if necessary. 8-9 1. Spark plug gap 2. Clean the surface of the spark plug gasket and its mating surface, and then wipe off any grime from the spark plug threads.
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