1998-2006 Yamaha F20/F25 Outboards Service Manual, Page 61Get this manual
_ CHAPTER PERIODIC INSPECTION AND ADJUSTMENT
MAINTENANCE INTERVAL CHART 3-1 PERIODIC SERViCE 3-2 COWLING 3-2 Water separator drain hole 3-2 FUEL SySTEM 3-2 Fuel line 3-2 Fuel filter replacement 3-2 CONTROL SYSTEM 3-2 Throttle link rod adjustment 3-2 Idle speed adjustment 3-3 Start-in-gear protection device adjustment3-3 POWER UNIT 3-4 Engine oil level 3-4 Engine oil replacement 3-4 Valve clearance adjustment 3-5 POWER TRIM AND TILT (PTT) SYSTEM 3-6 PTT fluid check 3-6 Hydraulic system air bleeding, 3-7 LOWER UNIT 3-7 Gear oil 3-7 Lower unit leakage check 3-8 GENERAL 3-9 Anode 3-9 Battery 3-9 Spark plugs 3-10 Lubrication points 3-11