Maintenance73 The power trim and tilt switches oper-ate even when the ignition key is off.Keep people away from the switcheswhenever working around the motor.When the motor is tilted, keep awayfrom the area under it or between it andthe clamp bracket. Be sure no one is inthis area before operating the powertrim and tilt mechanism. Allow the engine to cool before han-dling hot parts or fluids. Always completely reassemble the mo-tor before operation.Maintenance, replacement, or repair ofthe emission control devices and sys-tems may be performed by any marineengine repair establishment or individual.All warranty repairs, however, includingthose to the emission control system,must be performed by an authorizedYamaha marine dealership.A service manual is available for purchasethrough your Yamaha dealer for owners whohave the mechanical skills, tools, and otherequipment necessary to perform mainte-nance not covered by this owner’s manual.EMU28511Replacement partsIf replacement parts are necessary, use onlygenuine Yamaha parts or parts of equivalentdesign and quality. Any part of inferior qualitymay malfunction, and the resulting loss ofcontrol could endanger the operator andpassengers. Yamaha genuine parts and ac-cessories are available from your Yamahadealer.EMU35521Maintenance interval guidelinesThe service intervals provided in the Mainte-nance Chart were developed based upon“typical” use that includes operating at variedspeeds, with sufficient time for engine warmup and cool-down, a medium to light load,and an average cruising speed near the3000 to 4000 rpm range. As with any engine,however, if your normal operating conditionsare different, you should consider servicemore often than shown, especially how oftenyou change your engine oil and gear oil. Ex-amples might include extended wide-open-throttle use or long periods of trolling oridling, carrying heavy loads, or frequentstarting and stopping or shifting. More fre-quent maintenance will often pay off manytimes over in increased engine life and great-er owner satisfaction. Consult your Yamahadealer for additional maintenance recom-mendations.