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A. Fault tracing
A1 Dismantle the cylinder casing and remove the spar-
king plug. Reconnect the plug lead and rest the
sparking plug against ''earth'' e g the cylinder.
Check whether a spark occurs between the elec-
trodes when the engine is turned over by means of
the starter. The stop contact should be in position 1.
Try with a new sparking plug if there is sell no spark
then check that the connection between plug lead
and sparking plug cap is satisfactory.
A2 Disconnect the short-circuiting lead from the switch.
Turn the engine over and check whether a spark oc-
curs between the sparking plug electrodes. If it
does the stop contact is defective and should be re-
placed.
A3 If the ignition system is inoperative after carrying
out checks A1 and A2 dismantle the starter and guide
rail. It is not necessary to remove the tank filler cap.
Check that the short-circuitlng lead and plug lead are
not damaged.
A4 If no faults have been found in the previous checks,
the next step is to inspect the ignition coil.
Check the secondary winding of the ignition poll by
means of SEM ignition system tester No 502 51 24-01.
Connect the earth lead of the instrument to the
cylinder for example and the other lead to the plug
lead. The instrument should then give a reading
when set for resistance measurement.
A5. Remove the flywheel and ignition coil (see B. Dis-
mantling). Test the ignition coil under load.
Note that different makes of igolbon coil testers may
give different readings for the ignition coil. For this
reason we do not give any standard reading for the
coil but recommend the following test procedure:
Test three or four new ignition coils of the same type
as the one suspected of being defective. The avera-
ge reading obtained for these coils will then com-
prise a standard figure for the type of ignition coil
and tester in question Compare the reading for the
coil that may be defective with this standard figure.
If no test equipment is available we recommend re-
placement of the ignition coil after carrying out
checks A1-A4
Fig 5:4. SEM ignition system tester type G6/35E
A6. If no fault has been found in any of the previous checks
replace the electronic module or check it by means of
instrument No. 502 51 24-01.
5:1
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