Yamaha YT175J 1982 Service Manual page 23

CHAPTER 3. ENGINE OVERHAUL
ENGINE REMOVAL ...................................................... 3-1
Preparation for removal ............................................... 3-1
Exhaust ............................................................ 3-1
Wiring and cables .................................................... 3-1
Carburetor .......................................................... 3-2
Flywheel magneto ................................................... 3-2
Change pedal ....................................................... 3-3
Drive chain ......................................................... 3-3
Removal ............................................................ 3-3
ENGINE DiSASSEMBLy .................................................. 3-3
Reed valve assembly ................................................. 3-3
Cylinder head and cylinder ............................................ 3-3
Piston pin and piston ................................................. 3-4
Cran kcase cover. rig ht ................................................ 3-4
Clutch assembly and primary drive gear .................................. 3-4
Change shaft assembly ............................................... 3-6
Drive sprocket ....................................................... 3-6
Cran kcase .......................................................... 3-6
Transmission and shifter .............................................. 3-6
Crankshaft .......................................................... 3-7
INSPECTION AND REPAIR ..•............................................ 3-7
Cylinder head ....................................................... 3-7
Cylinder ............................................................ 3-7
j)iston pin and bearing ................................................ 3-8
Piston .............................................................. 3-8
Piston rings ......................................................... 3-9
Autolube pump ...................................................... 3-9
Starter ............................................................ 3-10
Clutch ............................................................ 3-11
Primary drive ....................................................... 3-14
Change shaft and change levers ....................................... 3-14
Transmission ....................................................... 3-14
Crankshaft ......................................................... 3-15
Bearings and oil seals ................................................ 3-15
Crankcase ......................................................... 3-15