11. CRANKCASE/CRANKSHAFT DOWNTOWN 125i
SERVICE INFORMATION
GENERAL INSTRUCTIONS
· This section covers crankcase separation to service the crankshaft. The engine must be removed
for this operation.
· When separating the crankcase, never use a driver to pry the crankcase mating surfaces apart
forcedly to prevent damaging the mating surfaces.
· When installing the crankcase, do not use an iron hammer to tap it.
· The following parts must be removed before separating the crankcase.
Cylinder head
Cylinder/piston (chapter 7)
Drive and driven pulley (chapter 8)
A.C. generator/starter clutch (chapter 10)
Rear wheel/rear shock absorber (chapter 16)
Starter motor (chapter 19)
Oil pump (chapter 4)
SPECIFICATIONS Unit: mm
Item Standard
0.150.35
Connecting rod big end side clearance
Crankshaft
Connecting rod big end radial clearance 00.008
TORQUE VALUES
Crankcase bolt 1.0 kgf-m
Cam chain tensioner slipper bolt 1.0 kgf-m
TROUBLESHOOTING
Excessive engine noise
· Excessive bearing play
· Excessive crankpin bearing play
· Worn piston pin and piston pin hole
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