V-Belt Driving System Specifications; V-Belt Driving System Troubleshooting; Shudder Or Misfire When Driving; Insufficient Horsepower Or Poor High Speed Performance - Eton VECTOR ST 250 Service Manual

8-2 Maintenance Description
Precautions in Operation
General Information
Drive face, clutch outer, and driven pulley can be serviced on the motorcycle.
Drive belt and drive pulley must be free of grease.
Specification of V-BELT SYSTEM
Driving belt width
OD of movable drive face boss
ID of movable drive face
OD of weight roller
ID of clutch outer
Thickness of clutch weight
Free length of driven pulley spring
OD of driven pulley boss
ID of driven face
Weight of weight roller
Torque value
Drive face nut: 8.5~10.5kgf-m
Clutch outer nut: 5.0~6.0kgf-m
Drive plate nut: 5.0~6.0kgf-m
Special Service Tools
8-3 Trouble Diagnosis
Engine can be started but motorcycle can
not be moved
1. Worn drive Belt
2. Worn drive face
3. Worn or damaged clutch weight
4. Broken driven pulley

Shudder or misfire when driving

1. Broken clutch weight
2. Worn clutch weight
Item Standard value (mm)
24.000
29.946~29.980
30.000~30.040
19.500~20.000
144.850~145.150
6.000
102.400
40.950~40.990
41.000~41.050
17.700~18.300
Clutch spring compressor:
Inner bearing puller:
Clutch nut wrench 39 x 41 mm:
Universal holder:
Bearing driver:
SYM-9100100
Insufficient horsepower or poor high
speed performance
1. Worn drive belt
2. Insufficient spring force of driven pulley
3. Worn roller
4. Driven pulley operation un-smoothly
59
Limit (mm)
22.500
29.926
30.060
19.000
145.450
3.000
97.400
40.930
41.070
g 17.200
SYM-2301000
SYM-6204002
SYM-9020200
SYM-2210100
g