2003 Yamaha Motorsports Vino Classic Owners Manual - Page 44
2003 Yamaha Motorsports Vino Classic Manual
Page 44 highlights
PERIODIC MAINTENANCE AND MINOR REPAIR To check the spark plug 1. Check that the porcelain insulator around the center electrode of the spark plug is a medium-tolight 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. 2. Check the spark plug for electrode erosion and excessive carbon or other deposits, and replace it if necessary. Specified spark plug: BPR7HS (NGK) 3. Install the spark plug with the spark plug wrench, and then tighten it to the specified torque. Tightening torque: Spark plug: 20 Nm (2.0 m·kgf, 14 ft·lbf) NOTE: If a torque wrench is not available when installing a spark plug, a good estimate of the correct torque is 1/4-1/2 turn past finger tight. However, the spark plug should be tightened to the specified torque as soon as possible. 4. Install the spark plug cap. a a. Spark plug gap 6 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. 6-6