Sym HD 125 Service Manual page 198

Inspection on Ignition Coil
Remove the luggage box.
Disengage the connector of the ignition coil and
the spark plug cap.
Measure the resistance between the terminals of
the primary winding.
Standard resistance: 0.17
Remove the cap from the spark plug and measure
the resistance between the spark plug and the
primary winding.
Standard resistance:
With no cap: 3.6
With cap:
Replacement
Loosen the lock bolt and replace the ignition coil if
necessary.
Inspection on Exciting Coil
Caution
The test can be carried out without removing the
exciting coil from the engine.
Remove the luggage box, rear carrier and body
covers.
Disconnect coupler of the exciting coil.
Measure the resistance between the black/red
terminal and the earth.
Standard resistance: 100~200
Please refer to the Section 10 for disassembly of
coil.
Inspection of Pulse Generator
Disconnect the coupler of the pulse generator and
measure the resistance between the terminals of
green/white and blue/yellow.
Standard resistance: 50~170
To this chapter contents
Ω ± 10%
Ω ± 10%
Ω
7.3~11 K
Ω
Ω
17. ELECTRICAL SYSTEM
Ignition coil
Pulse generator coupler
Spark plug
Exciting coil coupler
17-9