Yamaha F80B, Service Manual

Page: 68 / 249

POWR
6D93G11
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 .......................................................................... 5-32
Checking the cylinder head ..................................................................... 5-32
Installing the valves ................................................................................. 5-33
Installing the cylinder head ...................................................................... 5-34
Exhaust cover .............................................................................................. 5-37
Removing the exhaust cover ................................................................... 5-39
Checking the pressure control valve ....................................................... 5-39
Installing the pressure control valve ........................................................ 5-39
Installing the exhaust cover ..................................................................... 5-39