Engine; Chassis; Electrical - Yamaha YZ125 2019 Owner's Service Manual

CHAPTER 4

ENGINE

SEAT, FUEL TANK AND SIDE 
COVERS .................................................... 4-1
EXHAUST PIPE AND SILENCER ............. 4-4
RADIATOR................................................. 4-6
CARBURETOR AND REED VALVE ......... 4-9
CYLINDER HEAD, CYLINDER AND 
PISTON .................................................... 4-17
CLUTCH ................................................... 4-28
KICK SHAFT AND SHIFT SHAFT........... 4-34
YPVS GOVERNOR .................................. 4-42
WATER PUMP ......................................... 4-45
CDI MAGNETO ........................................ 4-48
ENGINE REMOVAL ................................. 4-51
CRANKCASE AND CRANKSHAFT ........ 4-55
TRANSMISSION, SHIFT CAM AND 
SHIFT FORK ............................................ 4-62
CHAPTER 5

CHASSIS

FRONT WHEEL AND REAR WHEEL ....... 5-1
FRONT BRAKE AND REAR BRAKE........ 5-9
FRONT FORK .......................................... 5-23
HANDLEBAR ........................................... 5-36
STEERING ............................................... 5-43
SWINGARM ............................................. 5-48
REAR SHOCK ABSORBER .................... 5-55
CHAPTER 6

ELECTRICAL

ELECTRICAL COMPONENTS AND 
WIRING DIAGRAM .................................... 6-1
IGNITION SYSTEM .................................... 6-3