Yamaha YW50AP Service Manual page 10

ENGINE OVERHAUL ......................................................................................................................... 4-1
WIREHARNESS AND CABLES ...................................................................................................... 4-1
CYLINDER HEAD, CYLINDER AND PISTON .................................................................................... 4-3
CYLINDER HEAD, CYLINDER AND PISTON ................................................................................ 4-3
PISTON PIN AND PISTON REMOVAL .......................................................................................... 4-4
CYLINDER HEAD INSPECTION ..................................................................................................... 4-4
CYLINDER AND PISTON INSPECTION ........................................................................................ 4-5
PISTON RINGS INSPECTION ........................................................................................................ 4-7
PISTON PIN AND PISTON PIN BEARING .................................................................................... 4-7
PISTON PIN AND PISTON INSTALLATION ................................................................................. 4-8
CYLINDER AND CYLINDER HEAD ................................................................................................ 4-9
V-BELT, CLUTCH AND SECONDARY/PRIMARY SHEAVE ........................................................... 4-11
KICK STARTER AND CRANKCASE COVER(LEFT)..................................................................... 4-11
KICK STARTER ............................................................................................................................. 4-12
KICK STARTER INSTALLATION ................................................................................................. 4-13
V-BELT, CLUTCH AND SECONDARY/PRIMARY SHEAVE ........................................................ 4-14
SECONDARY SHEAVE ................................................................................................................ 4-15
PRIMARY SHEAVE REMOVAL .................................................................................................... 4-16
SECONDARY SHEAVE REMOVAL.............................................................................................. 4-16
CLUTCH INSPECTION ................................................................................................................. 4-17
V-BELT INSPECTION ................................................................................................................... 4-18
PRIMARY SHEAVE INSPECTION ................................................................................................ 4-19
SECONDARY SHEAVE ................................................................................................................ 4-20
SECONDARY SHEAVE INSTALLATION ..................................................................................... 4-21
PRIMARY SHEAVE ...................................................................................................................... 4-22
STARTER CLUTCH AND STARTER MOTOR ................................................................................. 4-24
STARTER CLUTCH AND STARTER MOTOR.............................................................................. 4-24
STARTER CLUTCH AND GEARS INSPECTION ......................................................................... 4-26
C.D.I. MAGNET ................................................................................................................................ 4-27
C.D.I. MAGNETO ......................................................................................................................... 4-27
C.D.I. MAGNETO REMOVAL ....................................................................................................... 4-28
C.D.I. MAGNETO INSTALLATION .............................................................................................. 4-28
AUTOLUBE PUMP ........................................................................................................................... 4-29
AUTOLUBE PUMP ....................................................................................................................... 4-29
AUTOLUBE PUMP INSTALLATION ........................................................................................... 4-30
TRANSMISSION .............................................................................................................................. 4-31
TRANSMISSION .......................................................................................................................... 4-31
CRANKCASE AND REED VALVE .................................................................................................... 4-33
CRANKCASE AND REED VALVE ................................................................................................ 4-33
CRANKCASE(RIGHT) REMOVAL ................................................................................................ 4-35
CHECKING THE CRANKCASE .................................................................................................... 4-35
CHECKING THE BEARINGS AND OIL SEALS ............................................................................ 4-35
REED VALVE INSPECTION ......................................................................................................... 4-36
CRANKCASE (RIGHT) INSTALLATION ...................................................................................... 4-36
CRANKSHAFT .................................................................................................................................. 4-38
CRANKSHAFT .............................................................................................................................. 4-38
CRANKSHAFT REMOVAL ........................................................................................................... 4-39
CRANKSHAFT INSPECTION ....................................................................................................... 4-39
CRANKSHAFT INSTALLATION................................................................................................... 4-40
CHAPTER 4.
ENGINE