2005 Yamaha F90TR 90HP Outboards Factory Service Manual, Page 30Get this manual
Special service toolsMaintenance interval chart
Maintenance interval chart
Use the following chart as guideline for general maintenanceAdjust the maintenance intervals according to the operating conditions of the outboard motorItem Anodes (external) Anodes (internal) Battery Cooling water passages Top cowling Fuel filter (can be disassembled) Fuel system Gear oil Lubrication points Engine idle speed (EFI models) PCV (Pressure Control Valve) Power trim and tilt unit Propeller and cotter pin Shift linkshift cable Thermostat Throttle linkthrottle cable throttle pick-up timing Water pump Engine oil Oil filter Spark plugs Timing belt Remarks Checkreplace Checkreplace Checkcharge Clean Check Checkreplace Check Change Lubricate Checkadjust Check Check Checkreplace Checkadjust Check Checkadjust Check Checkchange Change Cleanadjust replace Checkreplace Initial Every