24
3 Electrical system
502 71 13-01
Checking ignition spark
Clean the electrodes and check the
electrode gap.
If the electrodes are worn down more
than 50% the plug should be replaced.
Check if there is a spark when starting.
Try with test plug No. 502 71 13-01 if
there is no spark.
Checking ignition spark
Remove the plug and clean from soot by
means of steel brush.
Check the electrode gap. It should be 0.5
mm – 0.7 mm (.020 – .028").
Adjust the gap to correct value with side
electrode.
If the electrodes are worn down more
than 50 % the plug should be replaced.
An overlarge gap implies stress on the
ignition module and the risk of short
circuiting.
Make sure that the stop contact is in start
position.
Earth the plug to the cylinder and pull the
start handle.
There should be a spark between the
electrodes.
If there is no spark try with the test plug
No. 502 71 13-01.
If there is a spark the fault lies in the plug.
Replace plug.
The chain saw is fitted with an electronic system
consisting of flywheel, ignition coil, and trigger
unit. Certain saw models are fitted with a gene-
rator system to heat the handles and carburettor.
The ignition system is electronic and completely
without moving parts. A defective component
cannot be repaired and must be replaced.
The ignition spark in an electronic ignition sys-
tem has a very short burn time and may therefore
be experienced as weak and sometimes difficult
to see during trouble shooting.
NOTE!
When testing the chain saw’s heating system the
guide bar, chain and clutch cover must be fitted
before the engine is started!
To Next Page
Loading...
Need help?
General
