1998-2006 Yamaha F20/F25 Outboards Service Manual, Page 61Get this manual
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_ 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