Eng - Yamaha YW125Y 2009 Service Manual

ENGINE REMOVAL .................................................................................. 5-1
LEADS AND HOSES ......................................................................... 5-1
ENGINE .............................................................................................. 5-3
INSTALLING THE ENGINE ............................................................... 5-4
CYLINDER HEAD ..................................................................................... 5-5
REMOVING THE CYLINDER HEAD................................................. 5-7
CHECKING THE CYLINDER HEAD ................................................. 5-9
INSTALLING THE CYLINDER HEAD ............................................. 5-10
THE ROCKER ARMS AND CAMSHAFT .............................................. 5-13
REMOVING THE ROCKER ARMS AND CAMSHAFT ................... 5-14
CHECKING THE CAMSHAFT......................................................... 5-15
CHECKING THE ROCKER ARMS AND ROCKER ARM
SHAFTS........................................................................................ 5-16
CHECKING THE TIMING CHAIN, CAMSHAFT SPROCKET AND
TIMING CHAIN GUIDES .............................................................. 5-17
CHECKING THE TIMING CHAIN TENSIONER ............................. 5-18
INSTALLING THE CAMSHAFT AND ROCKER ARMS ................. 5-19
VALVES AND VALVE SPRINGS ............................................................ 5-21
REMOVING THE VALVES ............................................................... 5-23
CHECKING THE VALVES AND VALVE GUIDES ........................... 5-24
CHECKING THE VALVE SEATS ..................................................... 5-27
CHECKING THE VALVE SPRINGS ................................................ 5-29
INSTALLING THE VALVES .............................................................. 5-30
CYLINDER AND PISTON....................................................................... 5-32
REMOVING THE CYLINDER AND PISTON .................................. 5-33
CHECKING THE CYLINDER AND PISTON ................................... 5-34
CHECKING THE PISTON RINGS ................................................... 5-36
CHECKING THE PISTON PIN ........................................................ 5-37
CHECKING THE TIMING CHAIN GUIDE (EXHAUST SIDE) ......... 5-38
INSTALLING THE PISTON AND CYLINDER ................................. 5-38
BELT DRIVE............................................................................................ 5-40
V-BELT CASE................................................................................... 5-40
V-BELT AND PRIMARY/SECONDARY SHEAVE ........................... 5-41
SECONDARY SHEAVE ................................................................... 5-42
REMOVING THE PRIMARY SHEAVE ............................................ 5-43
REMOVING THE SECONDARY SHEAVE AND V-BELT................ 5-43
DISASSEMBLING THE SECONDARY SHEAVE ........................... 5-44
CHECKING THE CLUTCH SHOES ................................................ 5-44
CHAPTER 5
ENGINE
5-71

ENG