PERIODIC MAINTENANCE AND ADJUSTMENT6-96To install the panelPlace the panel in the original position,and then install the bolt.EAU19652Checking the spark plugsThe spark plugs are important enginecomponents, which should be checkedperiodically, preferably by a Yamahadealer. Since heat and deposits willcause any spark plug to slowly erode,they should be removed and checkedin accordance with the periodic mainte-nance and lubrication chart. In addition,the condition of the spark plugs can re-veal the condition of the engine.The porcelain insulator around the cen-ter electrode of each spark plug shouldbe a medium-to-light tan (the ideal colorwhen the vehicle is ridden normally),and all spark plugs installed in the en-gine should have the same color. If anyspark plug shows a distinctly differentcolor, the engine could be operating im-properly. Do not attempt to diagnosesuch problems yourself. Instead, havea Yamaha dealer check the vehicle.If a spark plug shows signs of electrodeerosion and excessive carbon or otherdeposits, it should be replaced.Before installing a spark plug, the sparkplug gap should be measured with awire thickness gauge and, if necessary,adjusted to specification.Clean the surface of the spark pluggasket and its mating surface, and thenwipe off any grime from the spark plugthreads.1. Panel A2. Bolt12Specified 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)U39PE2E0.book Page 9 Thursday, November 8, 2012 9:24 AM
