Stihl MS 650

51MS 650, MS 660
While using the ZAT 3, hold it only
by the handle (4) or position it in a
safe place. Keep fingers or other
parts of your body at least 1 cm
away from the spark window (3),
high voltage connection (2), ground
connection (5) and the ground
terminal (1).
Warning!
High voltage – risk of electric shock.
– Set the Master Control lever
to “#“.
: Crank the engine quickly with the
rewind starter (min. 1,000 rpm)
and check sparkover in the
tester’s window (3).
Warning!
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 7.6.
– Remove the ignition module –
b 7.2.1
: Pull the grommet (1) off the high
voltage output (2).
: Unscrew the ignition lead (3) from
the contact pin and pull it out of
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3
1
2
4
the high voltage output.
: Remove the grommet and
insulating tube (4) from the
ignition lead.
: Pull the cover off the spark plug
boot.
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: Use suitable pliers to pull the leg
spring out of the spark plug boot.
– Unhook the leg spring from the
ignition lead.
– Pull the boot off the ignition lead.
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– Cut new ignition lead to a length
of 185 mm.
– Use a pointed tool to pierce the
center of the ignition lead’s
insulation, about 15 mm from the
end of the lead.
: Pinch the hook of the leg spring
into the center of the lead (arrow).
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7.2.3 Spark Plug Boot/
Ignition Lead