This important part in your ignition system carries out one basic task, providing the correct current to reach the spark-plug/s. If this is not working correctly or has broken down - and they frequently are - then renewal is the best option!
Check out these items - but please ensure they are correct for your model prior to placing your order:
30510MM8003
30751MAH003
30752MAH003
Replacing this part would normally be carried out during the course of spark-plug renewal. For all your electrical consumables, such as ignition coils, spark-plugs, condenser assemblies, regulator/rectifiers and much more, check out the schematic and 'Product Gallery' for your model.