Eton VECTOR ST 250 - Crankcase & Crank Specifications; Crankcase & Crank Troubleshooting; Engine Noise; General Information

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11-2 General information
Operational precautions
y This Section concerns disassembly of the crankcase for repair purpose.
y Remove following components before disassembling crankcase.
－Engine remove Section 5
－Cylinder head Section 6
－Cylinder and piston Section 7
－Drive face and driven pulley Section 8
－AC generator/Start one way clutch Section 10
y 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
Crankshaft
Run-out 0.030 0.100
Torque value
Bolts for crankcase 0.8~1.2kgf-m
Engine oil drain bolt 3.5~4.5kgf-m
Cylinder stud bolt 1.0~1.4kgf-m
Tools
Special tools
L. crank shaft oil seal driver (27*42*7): SYM-1332100-HMA
11-3 Trouble diagnosis
Engine noise
y Loose crankshaft bearing
y Loose crankshaft pin bearing
y Worn out piston pin and pin hole