Yamaha F50D Servise Manual page 141

Camshaft and valve
Disassembling the cylinder head.............................................. 7-32
Checking the valve spring ........................................................ 7-33
Checking the valve ................................................................... 7-33
Checking the valve guide ......................................................... 7-34
Replacing the valve guide ........................................................ 7-34
Checking the valve seat ........................................................... 7-35
Refacing the valve seat ............................................................ 7-35
Checking the rocker arm and rocker arm shaft ........................ 7-37
Checking the camshaft ............................................................. 7-38
Checking the cylinder head ...................................................... 7-38
Installing the valve .................................................................... 7-39
Installing the camshaft.............................................................. 7-40
Installing the rocker arm assembly ........................................... 7-40
Cylinder block
............................................................................ 7-42
Disassembling the cylinder block ............................................. 7-44
Checking the piston diameter ................................................... 7-45
Checking the cylinder bore ....................................................... 7-45
Checking the piston ring ........................................................... 7-45
Checking the piston ring end gap ............................................. 7-46
Checking the piston ring groove ............................................... 7-46
Checking the piston ring side clearance................................... 7-46
Checking the piston pin boss inside diameter .......................... 7-47
Checking the piston pin ............................................................ 7-47
Checking the connecting rod small end and big end inside
diameter.................................................................................. 7-47
Checking the connecting rod big end side clearance ............... 7-47
Checking the crankshaft ........................................................... 7-48
Checking the crankshaft journal oil clearance .......................... 7-48
Checking the crankpin oil clearance......................................... 7-50
Selecting the crankshaft journal bearing .................................. 7-51
Selecting the crankpin bearing ................................................. 7-51
Assembling the cylinder block .................................................. 7-52
................................................................. 7-30
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