M.20 Part. N. 8000 H1344 (10-2009)
ELECTRIC SYSTEM, DIGITAL INSTRUMENT
Ignition coil resistance check
To gain access to the electronic coil (1) remove the saddle and the fuel tank (see
pages E.15-E.23). Detach the ignition coil from main wiring harness. Remove
the fastening screws, the ignition coil then measure the resistance in the primary
and secondary windings using a tester.
- Primary winding resistance: 4.5 Ω ±15% a 20°C.
- Secondary winding resistance: 5 KΩ ±20% a 20°C (without spark plug cap
cable).
If the resistance is not between the specied values, replace the electronic
coil.
Also, check the resistance of the terminal cap contact with the spark plug.
- Terminal cap resistance: 4.5÷5.5 KΩ ±5% a 20°C. If the resistance is not be-
tween the specied values, replace the electronic coil.
NOTE: The ignition coil is fastened under the fuel tank. On an area totally ex-
empt from oxidization or paint; if the earth contact is not perfect this could cause
damage to the coil and ignition faults as well.
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