INSTRUMENT AND CONTROL FUNCTIONS3-263on the passenger seat, remove thepassenger seat, unhook the strapsfrom the hooks, and then install theseat with the straps hanging out fromunder the passenger seat. (See page3-19.)EAU41940EXUP systemThis model is equipped with Yamaha’sEXUP (EXhaust Ultimate Power valve)system. This system boosts enginepower by means of a valve that regu-lates the diameter of the exhaust pipe.The EXUP system valve is constantlyadjusted in accordance with the enginespeed by a computer-controlled servo-motor.NOTICEECA15610The EXUP system has been set andextensively tested at the Yamahafactory. Changing these settingswithout sufficient technical knowl-edge may result in poor perfor-mance of or damage to the engine.EAU15301SidestandThe sidestand is located on the left sideof the frame. Raise the sidestand orlower it with your foot while holding thevehicle upright.TIPThe built-in sidestand switch is part ofthe ignition circuit cut-off system, whichcuts the ignition in certain situations.(See further down for an explanation ofthe ignition circuit cut-off system.)WARNINGEWA10240The vehicle must not be ridden withthe sidestand down, or if the side-stand cannot be properly moved up(or does not stay up), otherwise thesidestand could contact the groundand distract the operator, resultingin a possible loss of control.Yamaha’s ignition circuit cut-offsystem has been designed to assistthe operator in fulfilling the respon-sibility of raising the sidestand be-fore starting off. Therefore, checkthis system regularly as describedU2D1E3E0.book Page 26 Monday, July 14, 2008 3:08 PM