Sym MAXSYM 400i User Manual

11. Crankshaft / Crankcase
11-2
Precautions in Operation
 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
Crankshaft
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
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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Sym MAXSYM 400i Specifications

General

Brand	Sym
Model	MAXSYM 400i
Category	Scooter
Language	English