PERIODIC MAINTENANCE3-83. Install:• Storage boxRefer to “GENERAL CHASSIS (2)” on page4-3.EAS30625CHECKING THE EXHAUST SYSTEM1. Check:• Exhaust pipe “1”• Muffler “2”Cracks/damage → Replace.• Gaskets “3”, “4”Exhaust gas leaks → Replace.2. Check:Tightening torque• Exhaust pipe nuts “5”• Muffler joint bolt “6”• Muffler bolts “7”EAS30799ADJUSTING THE EXHAUST GAS VOLUMETIP• Be sure to set the CO density level to standard,and then adjust the exhaust gas volume.• To adjust the exhaust gas volume, use the COadjustment mode of the Yamaha diagnostictool. For more information, refer to the opera-tion manual of the Yamaha diagnostic tool.1. Connect the Yamaha diagnostic tool to theconnector. For information about connectingthe Yamaha diagnostic tool, refer to“YAMAHA DIAGNOSTIC TOOL” on page8-29.EAS30628REPLACING THE AIR FILTER ELEMENTTIPCheck the air filter check hose “1” that is locatedon the rear side of the air filter case. If dust orwater or both collects in the hose, clean the hoseand replace the air filter element.1. Remove:• Air filter case cover “1”• Air filter element “2”T R..Exhaust pipe nut20 Nm (2.0 m·kgf, 14 ft·lbf)Muffler joint bolt12 Nm (1.2 m·kgf, 8.7 ft·lbf)Muffler bolt53 Nm (5.3 m·kgf, 38 ft·lbf)236751 4Yamaha diagnostic tool90890-03231112