2004 Yamaha Motorsports Zuma Owners Manual - Page 44
2004 Yamaha Motorsports Zuma Manual
Page 44 highlights
PERIODIC MAINTENANCE AND MINOR REPAIR 2. Check the spark plug for electrode erosion and excessive carbon or other deposits, and replace it if necessary. Specified spark plug: BPR7HS(NGK) 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) 2. Clean the surface of the spark plug gasket and its mating surface, and then wipe off any grime from the spark plug threads. 3. Install the spark plug with the spark plug wrench, and then tighten it to the specified torque. 1 1. Spark plug wrench 1 1. Spark plug gap 6 To remove the spark plug 1. Remove panel A. (See page 6-5 for panel removal and installation procedures.) 2. Remove the spark plug cap. 3. Remove the spark plug as shown, with the spark plug wrench included in the owner's tool kit. 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 scooter is ridden normally). NOTE: If the spark plug shows a distinctly different color, the engine could be defective. Do not attempt to diagnose such problems yourself. Instead, have a Yamaha dealer check the scooter. 6-6