Yamaha LB50IIAC - Yamaha Engine Overhaul; Engine Disassembly Procedures

CHAPTER 3. ENGINE OVERHAUL
REMOVAL ...................................................................................................................... 50
Preparation for removal ........................................................................................ 50
Removal ................................................................................................................. 53
DISASSEMBLY .............................................................................................................. 53
Reed valve assembly ............................................................................................ 53
Cylinder head and cylinder ................................................................................... 54
Piston pin and piston ............................................................................................ 54
Crankcase cover, right .......................................................................................... 54
Clutch assembly and primary gear ..................................................................... 55
Kick axle assembly ................................................................................................ 56
Shifter rod assembly ............................................................................................. 56
Crankcase ...............................................................................................................
57
Transmission ......................................................................................................... 57
Crankshaft assembly··················································:·········································· 58
INSPECTION AND REPAIRING ..................................................................................... 58
Cylinder head ......................................................................................................... 58
Cylinder .................................................................................................................. 59
Piston pin and bearing .......................................................................................... 59
Pi~n ...................................................................................................................... 60
Piston rings ............................................................................................................ 62
Auto lube pump ...................................................................................................... 63
Clutch .................................................................................................................... 67
Kick starter ............................................................................................................. 69
Sub-Transmission ................................................................................................. 70
Crankshaft .............................................................................................................. 71
Bearings and oil seals ........................................................................................... 72
Crankcase ............................................................................................................... 73
ENGINE ASSEMBLING AND ADJUSTMENT .............................................................. 7 4
Crankshaft installation .......................................................................................... 7 4
Sub-Transmission installation .............................................................................. 75
Crankcase ............................................................................................................... 79
Shifter .....................................................................................................................
80
Kick starter assembly ............................................................................................ 80
Pump drive gear and primary drive gear ............................................................ 80
Primary gears and clutches ..................................................................................
81
Crankcase cover, right .......................................................................................... 81