Yamaha F90D - Power Unit

POWR
6D81G11
Power unit
Special service tools .....................................................................................5-1
Power unit.......................................................................................................5-3
Checking the compression pressure .........................................................5-3
Checking the oil pressure ..........................................................................5-3
Checking the valve clearance..................................................................5-10
Replacing the timing belt .........................................................................5-13
Removing the power unit.........................................................................5-16
Removing the timing belt and sprockets..................................................5-17
Checking the timing belt and sprockets...................................................5-18
Installing the sprockets and timing belt....................................................5-18
Throttle link...................................................................................................5-20
ECM ...............................................................................................................5-21
Junction box.................................................................................................5-22
Cylinder head ...............................................................................................5-24
Removing the cylinder head ....................................................................5-26
Checking the valve lifters.........................................................................5-27
Checking the valve springs......................................................................5-27
Checking the valves ................................................................................5-27
Checking the valve guides.......................................................................5-28
Replacing the valve guides......................................................................5-28
Checking the valve seat ..........................................................................5-29
Refacing the valve seat ...........................................................................5-30
Checking the camshafts ..........................................................................5-31
Checking the cylinder head .....................................................................5-32
Installing the valves .................................................................................5-33
Installing the cylinder head ......................................................................5-33
Exhaust cover ..............................................................................................5-36
Removing the exhaust cover ...................................................................5-38
Checking the pressure control valve .......................................................5-38
Installing the pressure control valve ........................................................5-38
Installing the exhaust cover .....................................................................5-38