8 --- No spark at plug
Ignition switch not on.
Engine stop switch off.
Fuse blown. Check fuse for ignition circuit. See wiring diagram on Chapter10
Battery voltage low. The current draw required by a starter motor is sufficiently high that an under-charged battery may not have enough spare capacity to provide power for the ignition circuit during starting.
Load shedding relay faulty, causing same symptoms as above. Renew the relay.
Starter motor inefficient. A starter motor with worn brushes and a worn or dirty commutator will draw excessive amounts of current causing power starvation in the ignition system. See the preceding paragraph. Starter motor overhaul will be required.
Spark plug failure. Clean the spark plugs thoroughly and reset the electrode gaps. Refer to the spark plug section and the color condition guide in Routine Maintenance - Spark plug check. If a spark plug shorts internally or has sustained visible damage to the electrodes, core or ceramic insulator it should be renewed. On rare occasions a plug that appears to spark vigorously will fail to do so when refitted in the cylinder.
Spark plug cap or high tension (HT) lead faulty. Check condition and security. Replace if deterioration is evident.
Spark plug cap loose. Check that the spark plug caps fit securely over the plug and, where fitted, the screwed terminal on the plug end are secure.
Shorting due to moisture. Certain parts of the ignition system are susceptible to shorting when the machine is ridden or parked in wet weather. Check particularly the area from the spark plug cap back to the ignition coil. A water dispersant spray may be used to dry out waterlogged components. Recurrence of the problem can be prevented by using an ignition sealant spray after drying out and cleaning.
Ignition or stop switch shorted. May be caused by water, corrosion or wear. Water dispersant and contact cleaning sprays may be used. If this fails to overcome the problem dismantling and visual inspection of the switches will be required.
Shorting or open circuit in wiring. Failure in any wire connecting any of the ignition components will cause ignition malfunction. Check also all connections are clean, dry and tight.
Ignition coil failure. Check the coil, referring to Chapter 6 - Ignition.
© April 2014