General Information; Trouble Diagnosis - Sym GTS 250 Service Manual

11. Crankcase / Crank

General Information

Operational precautions
 This Section concerns disassembly of the crankcase for repair purpose.
 Remove following components before disassembling crankcase.
－Engine remove
－Cylinder head
－Cylinder and piston
－Drive face and driven pulley
－AC generator/Start one way clutch
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
Connecting rod side clearance of the big end
Vertical clearance of the big end of the connecting rod
Run-out
Torque value
Bolts for crankcase
Cylinder stud bolts
Bolt for cam chain adjuster
Special tools
R/L. crank disassemble tool
L. crank shaft bearing puller
Crank shaft install socket & oil seal driver
Crank shaft puller
Outer bearing puller
Inner bearing puller
Clutch nut wrench

Trouble Diagnosis

Engine noise
 Loose crankshaft bearing
 Loose crankshaft pin bearing
 Worn out piston pin and pin hole
11-2
To this chapter contents
Chapter 5
Chapter 6
Chapter 7
Chapter 8
Chapter 10
Item
0.8~1.2kgf-m
1.0~1.4kgf-m
1.2~1.6kgf-m
SYM-1120000-HMA H9A
SYM-9100100
SYM-2341110- HMA RB1
SYM-1130000-HMA H9A
SYM-6204001
SYM-6204022
SYM-9020200
Standard
0.100~0.400
0~0.008
-
Unit: mm
Limit
0.600
0.050
0.100