VESPA 664787, Service Station Manual

Page: 53 / 179

Checks and inspections
All the control operations of the system that entail
disconnecting cables (to check connections and
the devices making up the ignition circuit) must be
done with the engine off: if this is not done, the
controls might be irreparably damaged.
Ignition circuit
1) Check the condition of the spark plug (clean it
with a metal brush, remove deposits, apply short
blasts of compressed air and, if necessary, replace
it).
2) Without removing the stator, carry out the fol-
lowing checks:
After visually checking the electrical wiring, use a
specific tester to measure the loading reel, the
pick-up (see chart) and cable continuity.
- If checks on the loading boil, the pick-up and ca-
ble continuity show irregularities, replace the sta-
tor; otherwise replace the control unit.
- Remember that the engine must be off to dis-
connect any connections in order to replace the
central unit.
Specific tooling
020331Y Digital multimeter
P
ICK
- U
P
C
HECK
(F
IGURE
A)
Specification Desc./Quantity
1 Red cable (1) and White cable (2) 90 ÷ 140 Ohm
R
ECHARGING COIL CHECK
(F
IGURE
B)
Specification Desc./Quantity
1 Red cable (3) and Green cable (4) 800 ÷ 1100 Ohm
C
ONTINUITY CHECK
Specification Desc./Quantity
1 White cable - Engine Continuity
2 White cable - Frame Continuity
Vespa S 50 2T
Electrical system
ELE SYS - 53