Sym JOYMAX 250 User Manual

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-6204001
Inner bearing puller SYM-6204022
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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Sym JOYMAX 250 Specifications

General

Brand	Sym
Model	JOYMAX 250
Category	Scooter
Language	English