11. Crankcase / Crank
11-2
General Information
Operational precautions
This Section concerns disassembly of the crankcase for repair purpose.
Remove following components before disassembling crankcase.
－Engine remove Chapter 5
－Cylinder head Chapter 6
－Cylinder and piston Chapter 7
－Drive face and driven pulley Chapter 8
－AC generator/Start one way clutch Chapter 10
In case it requires replacing the crankshaft bearing, the driving chain of engine oil pump or the timing
chain, it is preferably to replace crankshaft as a unit.
Specification Unit: mm
Item
Standard Limit
Connecting rod side clearance of the big end 0.100~0.400 0.600
Vertical clearance of the big end of the connecting rod 0~0.008 0.050
Run-out - 0.100
Torque value
Bolts for crankcase 0.8~1.2kgf-m
Cylinder stud bolts 1.0~1.4kgf-m
Bolt for cam chain adjuster 1.2~1.6kgf-m
Special tools
R/L. crank disassemble tool SYM-1120000-HMA H9A
L. crank shaft bearing puller SYM-9100100
Crank shaft install socket & oil seal driver SYM-2341110- HMA RB1
Crank shaft puller SYM-1130000-HMA H9A
Outer bearing puller SYM-6204010
Inner bearing puller SYM-6204025
Clutch nut wrench SYM-9020200
Trouble Diagnosis
Engine noise
Loose crankshaft bearing
Loose crankshaft pin bearing
Worn out piston pin and pin hole
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