Removing And Installing - Stihl BR 500 Service Manual

If a spark is visible, the ignition
system is in order. If no spark is
visible in the window (2), check the
ignition system with the aid of the
troubleshooting chart, b 8.7.
5910 850 4520
1
2 3
Using ZAT 3 ignition system
tester 5910 850 4520
– Before starting the test, install a
new spark plug in the cylinder
and tighten it down firmly, b 3.4
: Pull the boot off the spark plug
and connect it to terminal (2).
: Attach ground terminal (1) to the
spark plug.
: Use adjusting knob (4) to set
spark gap to about 2 mm.
46
When using the ZAT 3, hold it only
by the handle (4) or position it in a
safe place. Keep fingers and other
parts of body at least 1 cm away
from the spark window (3), the high
voltage connection (2), ground
connection (5) and the ground
terminal (1).
The high voltages that occur can
cause an electric shock.
– Crank the engine quickly with the
ZAT 3
rewind starter (min. 1,000 rpm)
and check spark in the tester's
window (3).
Warning!
4
The engine may start and
accelerate during the test.
If a spark is visible, the ignition
system is in order.
If no spark is visible in the
window (3), check the ignition
system with the aid of the
troubleshooting chart, b 8.7.
8.4

Removing and Installing

1
2
3
4
– Remove the shroud with rewind
starter, b 5.9
: Disconnect the ground wire (1).
: Disconnect the short circuit
wire (2).
: Take out the screw (3) with
washer.
: Remove the screw (4) with
connector tag.
– Remove the washers from
between the ignition module and
cylinder.
Check the ignition module and wires
for damage and replace as
necessary.
Install in the reverse sequence.
BR 500, BR 550, BR 600