Yamaha F90D Service Manual

Also see for F90D: Ower's manual

Contents

POWR6D81G11Power unitSpecial service tools .....................................................................................5-1Power unit....................................................................................................... 5-3Checking the compression pressure .........................................................5-3Checking the oil pressure ..........................................................................5-3Checking the valve clearance.................................................................. 5-10Replacing the timing belt .........................................................................5-13Removing the power unit.........................................................................5-16Removing the timing belt and sprockets.................................................. 5-17Checking the timing belt and sprockets...................................................5-18Installing the sprockets and timing belt....................................................5-18Throttle link................................................................................................... 5-20ECM ............................................................................................................... 5-21Junction box.................................................................................................5-22Cylinder head ...............................................................................................5-24Removing the cylinder head .................................................................... 5-26Checking the valve lifters.........................................................................5-27Checking the valve springs...................................................................... 5-27Checking the valves ................................................................................ 5-27Checking the valve guides....................................................................... 5-28Replacing the valve guides...................................................................... 5-28Checking the valve seat ..........................................................................5-29Refacing the valve seat ...........................................................................5-30Checking the camshafts ..........................................................................5-31Checking the cylinder head ..................................................................... 5-32Installing the valves ................................................................................. 5-33Installing the cylinder head ...................................................................... 5-33Exhaust cover ..............................................................................................5-36Removing the exhaust cover ................................................................... 5-38Checking the pressure control valve .......................................................5-38Installing the pressure control valve ........................................................ 5-38Installing the exhaust cover ..................................................................... 5-38