2005 Yamaha F90TR 90HP Outboards Factory Service Manual, Page 28Get this manual
Periodic checks and adjustments
Special service tools .3-1 Maintenance interval chart3-2 Top cowling 3-3 Checking the top cowling.3-3 Fuel system 3-3 Checking the fuel joint and fuel hoses (fuel joint-to-fuel injector) 3-3 Checking the fuel filter 3-3 Power unit3-4 Checking the engine oil .3-4 Changing the engine oil using an oil changer3-4 Changing the engine oil by draining it .3-4 Replacing the oil filter 3-5 Checking the timing belt 3-6 Checking the spark plugs 3-6 Checking the thermostat3-7 Checking the cooling water passage.3-8 Control system 3-8 Checking the engine idle speed 3-8 Adjusting the throttle link and throttle cable3-8 Checking the gear shift operation 3-10 Bracket unit 3-11 Checking the power trim and tilt operation 3-11 Checking the power trim and tilt fluid level 3-11 Lower unit 3-12 Checking the gear oil level 3-12 Changing the gear oil 3-12 Checking the lower unit for air leakage .3-13 Checking the propeller3-13 General3-14 Checking the anodes3-14 Checking the battery 3-14 Lubricating the outboard motor3-15