Periodic maintenance and adjustment7-1273. Insert the tailpipe into the muffler,and then install and tighten thescrew.TIPMake sure to align the screw holewhen inserting the tailpipe.EAU39931Adjusting the carburetorThe carburetor is an important part ofthe engine and requires very sophisti-cated adjustment. Therefore, mostcarburetor adjustments should be leftto a Yamaha dealer, who has the nec-essary professional knowledge and ex-perience. The adjustment described inthe following section, however, may beserviced by the owner as part of rou-tine maintenance.NOTICEECA10551The carburetor has been set and ex-tensively tested at the Yamaha fac-tory. Changing these settingswithout sufficient technical knowl-edge may result in poor perfor-mance of or damage to the engine.1. Spark arrester1