2007-2009 Yamaha F15/F20 Outboard Service Manual, Page 92Get this manual
Power unit (check and adjustment) NOTE: Because the Prime Start operates when the engine is started, the engine idle speed will be above specificationTherefore, measure the oil pressure after the engine has been warmed up3Measure the oil pressureCheck the oil pump and oil strainer, and for oil leakage if out of specificationOil pressure (reference data): 400 kPa (4.0 kgfcm2, 58.0 psi) at engine idle speed S6AG5050
Checking the valve clearance
5Measure the intake and exhaust valve clearances for cylinder #1Adjust if out of specification
NOTE: Measure the valve clearances when the engine is cold1Remove the sprocket cover and manual starter(Manual starter model) Remove the sprocket cover and flywheel magnet cover(Electric starter model) 2Disconnect the spark plug caps and remove the spark plugs3Remove the cooling water hoses 1, fuel hoses 2, fuel pump 3, blowby hose 4, and cylinder head cover 5