Stihl 66 - Chain Sprocket Maintenance

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Release the rotor -
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Let go of rope slowly so that it winds
onto the rotor.
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The starter grip must sit firmly in the
rope guide bush. If the grip droops
to one side: Increase spring tension
by one additional turn.
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When starter rope is fully extended
it must be possible to rotate the rotor
at least another half turn. If this is
not the possible, the spring is over-
tensioned and could break
Take off one turn of the rope.
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Fit the fan housing on the
crankcase.
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Set the Master Control lever to
Push the remaining rope into
the starter grip so that the nipple (6)
is flush with the grip.
Replacing a broken rewind spring
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Lubricate the new spring with a few
drops of non-resinous oil -
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Remove the rope rotor -
see "Replacing Starter Rope" -
The bits of spring in the fan housing
might still be under tension and could fly
apart when you take them out of the
housing. To avoid risk of injury, wear
eye and face protection and work gloves.
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Remove the spring housing and
parts of spring.
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Fit the new spring housing -
bottom plate must face upward -
slip outer spring loop over lug -
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Reinstall the rope rotor, tension the
rewind spring, fit the fan housing
and secure it in position.
If the spring pops out of its housing
during installation: refit it in the
counterclockwise direction, starting
outside and working inward.
Replace the chain sprocket
after using two Oilomatic chains
or sooner if the wear marks on the
sprocket are deeper than approx.
0.5 mm (
1
/
64
") since this would reduce
the life of the chain.
Check wear marks:
Left: on webs of rim sprockets -
Right: on teeth of spur sprockets.
You can use gauge* 0000 893 4101
to check the depth of the wear marks on
spur and rim sprockets.
It is best to use two chains in rotation
with one sprocket.
Before removing chain sprocket
Remove chain sprocket cover, chain
and guide bar. Disengage the chain
brake:
Pull hand guard toward front handle.
*Special accessory
6
001BA104 ST
137BA020 KN
Checking and Replacing
Chain Sprocket
42 066