1998-2006 Yamaha F20/F25 Outboards Service Manual, Page 179Get this manual

1998-2006 Yamaha F20/F25 Outboards Service Manual, Page 179

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Thermostat inspection 1 Measure: Valve operating temperature Valve lift Out of specification Replace the thermostat-Water temperature Below 60 (140 F) Above 70 (158 F) Valve lift