Yamaha F90D, Service Manual, Page: 30 / 241

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Maintenance interval chart
3
Use the following chart as a guideline for general maintenance.
Adjust the maintenance intervals according to the operating conditions of the outboard motor.
NOTE:
When operating in salt water, turbid or muddy water, the engine should be flushed with clean water
after each use.
NOTE:
When using lead or high-sulfur gasoline, checking valve clearance may be required more frequently
than every 500 hours.
Item Remarks
Initial Every
Refer to
page
10 hours
(1 month)
50 hours
(3 months)
100 hours
(6 months)
200 hours
(1 year)
Anodes (external) Check/replace 3-14
Anodes (internal) Check/replace 3-14
Battery Check/charge 3-14
Cooling water passages Clean 3-8
Top cowling Check 3-3
Fuel filter
(can be disassembled) Check/replace 3-3
Fuel system Check 3-3
Gear oil Change 3-12
Lubrication points Lubricate 3-15
Engine idle speed
(EFI models) Check/adjust 3-8
PCV (Pressure Control Valve) Check 5-38
Power trim and tilt unit Check 3-11
Propeller and cotter pin Check/replace 3-13
Shift link/shift cable Check/adjust 3-10
Thermostat Check 3-7
Throttle link/throttle cable/
throttle pick-up timing Check/adjust 3-8
Water pump Check 6-9
Engine oil Check/change 3-4
Oil filter Change 3-5
Spark plugs Clean/adjust/
replace 3-6
Timing belt Check/replace 3-6
Item Remarks
Every
Refer to
page
500 hours
(2.5 years)
1,000 hours
(5 years)
Timing belt Replace 5-13
Valve clearance (DOHC) Check/adjust 5-10
Special service tools / Maintenance interval chart