Technical data

129
CRANKCASE - CRANKSHAFT
SPLITTING THE CRANKCASE HALVES
Version 125
Remove the following assemblies: transmission cover, driving
pulley, driven pulley and belt, rear hub cover, gears, bearings
and oil guards as described in the Transmission chapter.
- Remove the oil sump, the by-pass, the chain compartment
cover, the oil pump as described in the
Lubrication chapter.
Remove the flywheel cover with water pump, the flywheel,
the stator as described in the Magneto flywheel chapter.
- Remove the oil filter and the oil pressure switch.
- Remove the cylinder-piston-head unit as described in the
Timing head cylinder chapter.
- Remove the 2 screws shown in the figure and the starter
motor.
Before opening the engine crankcase, check the driving shaft
axial clearance. To this purpose, use a plate and a support
with specific comparator tool.
Higher clearance denotes wear of the crankcase driving
shaft rest surfaces.
Standard clearance:
0,15 ÷ 0,40 mm
- Remove the 11 screws securing the two halfcrankcases.
- Split the crankcase halves taking care to leave the cranks-
haft attached to of the two halves.
- Remove the crankshaft.
CAUTION
FAILURE TO OBSERVE THIS RULE CAN CAUSE THE ACCIDEN-
TAL DROP OF THE DRIVING SHAFT.
CRANKCASE CRANKSHAFT