PERIODIC MAINTENANCE AND ADJUSTMENT6-96To install the panelPlace the panel in the original position,and then install the bolt.EAU19653Checking the spark plugsThe spark plugs are important enginecomponents, which should bechecked periodically, preferably by aYamaha dealer. Since heat and depos-its will cause any spark plug to slowlyerode, they should be removed andchecked in accordance with the peri-odic maintenance and lubricationchart. In addition, the condition of thespark plugs can reveal the condition ofthe engine.The porcelain insulator around thecenter electrode of each spark plugshould be a medium-to-light tan (theideal color when the vehicle is riddennormally), and all spark plugs installedin the engine should have the samecolor. If any spark plug shows a dis-tinctly different color, the engine couldbe operating improperly. Do not at-tempt to diagnose such problemsyourself. Instead, have a Yamaha deal-er check the vehicle.If a spark plug shows signs of elec-trode erosion and excessive carbon orother deposits, it should be replaced.Before installing a spark plug, thespark plug gap should be measuredwith a wire thickness gauge and, ifnecessary, adjusted to specification.Clean the surface of the spark pluggasket and its mating surface, andthen wipe off any grime from the sparkplug threads.1. Panel A2. Bolt12 Specified spark plug:NGK/CR9E1. Spark plug gapSpark plug gap:0.7–0.8 mm (0.028–0.031 in)Tightening torque:Spark plug:13 Nm (1.3 m·kgf, 9.4 ft·lbf)
