2007-2009 Yamaha F15/F20 Outboard Service Manual, Page 129Get this manual

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Power unit
Checking the valve guide
Valve margin thickness a: Intake: 0.81.2 mm (0.03150.0472 in) Exhaust: 1.01.4 mm (0.03940.0551 in) 3 Measure the valve stem diameter bReplace the valve

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