Yamaha Scorpio, Service Manual

Page: 76 / 300

ENG
CHAPTER 4.
ENGINE OVERHAUL
ENGINE REMOVAL ...................................................................................... 4-1
ENGINE OIL .......................................................................................... 4-1
EXHAUST PIPE ASSEMBLY ................................................................ 4-1
LEFT FOOTREST BRACKET ............................................................... 4-2
DRIVE CHAIN ........................................................................................ 4-2
CARBURETOR ...................................................................................... 4-3
WIRE, CABLE AND TUBE .................................................................... 4-3
STARTER MOTOR ................................................................................ 4-4
ENGINE ................................................................................................. 4-4
ENGINE INSTALLATION ............................................................................. 4-5
ENGINE ASSEMBLY ............................................................................. 4-5
STARTER MOTOR ................................................................................ 4-5
WIRE AND CABLES .............................................................................. 4-5
CARBURETOR ...................................................................................... 4-6
DRIVE CHAIN ........................................................................................ 4-6
LEFT FOOTREST BRACKET ............................................................... 4-6
EXHAUST ASSEMBLY ......................................................................... 4-7
FUEL TANK AND SEAT ........................................................................ 4-7
CYLINDER HEAD ......................................................................................... 4-9
CYLINDER HEAD REMOVAL ............................................................. 4-10
CYLINDER HEAD INSPECTION ......................................................... 4-12
TIMING CHAIN TENSIONER INSPECTION ....................................... 4-13
CYLINDER HEAD INSTALATION ....................................................... 4-14
CAMSHAFT AND ROCKER ARMS .......................................................... 4-16
ROCKER ARM AND CAMSHAFT REMOVAL .................................... 4-17
CAMSHAFT INSPECTION .................................................................. 4-18
ROCKER ARMS AND ROCKER ARM SHAFTS INSPECTION .......... 4-18
CAMSHAFT AND ROCKER ARM INSTALLATION ............................ 4-19
VALVES AND VALVE SPRINGS ............................................................... 4-21
VALVE AND VALVE SPRINGS REMOVAL ........................................ 4-22
VALVES AND VALVE SPRINGS INSPECTION ................................. 4-24
VALVE SEATS INSPECTION ............................................................. 4-25
VALVES AND VALVE SPRINGS INSTALLATION .............................. 4-27
CYLINDER AND PISTON ........................................................................... 4-29
PISTON REMOVAL ............................................................................. 4-30
CYLINDER INSPECTION .................................................................... 4-31
PISTON AND PISTON PIN INSPECTION .......................................... 4-32
PISTON RINGS INSPECTION ............................................................ 4-33
PISTON RINGS, PISTON AND CYLINDER INSTALLATION ............. 4-34