12. Crankshaft / Crankcase
12-2
General Information
Operational precautions
• This Section concerns disassembly of the crankcase for repair purpose.
• Remove following components before disassembling crankcase.
─Engine Section 5
－Cylinder head Section 6
－Cylinder and piston Section 7
－Drive pulley and driven pulley Section 8
－AC generator/Start driven gear Section 10
－Starting motor Section 16
• 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.
Service data
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
Crankshaft
Run-out - 0.100
Torque value
Bolts for crankcase 0.8~1.2kgf-m
Bolts for cam chain adjuster 1.2~1.6kgf-m
Tools
Special tools
R/L. crank disassemble/ install tool
L. crank shaft bearing driver
Crank shaft bearing fixing socket
Crank shaft puller
Outer bearing puller
Inner bearing puller
Troubleshooting
Engine noise
• Loose crankshaft bearing
• Loose crankshaft pin bearing
• Worn out piston pin and pin hole
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