When the engine is tested at the factory the carburetor
is set to obtain a slightly richer mixture to ensure that the
cylinder bore and the bearings receive additional lubrica-
tion during the break-in period. This setting should be left
as
it is for the first
three
tank fillings. The high speed
adjusting screw may then be turned no more than 14 turn
clockwise (leaner mixture). Caution: The engine's maxi-
mum
permissible
rpm must not
be exceeded!
If
you use your chain saw at high altitudes (mountains)
or at sea level it may be necessary to change
the carbure-
tor setting
slightly.
Carry out
the correction
at
the two
adjusting screws (L and H) as follows: Turn clockwise
(leaner) for high altitude operation or counterclockwise
(richer) for
operation at sea level.
Note that even slight alterations on the adjusting screws
have
a
noticeable effect on the engine's running behavior.
Only carry out
carburetor
adjustments after cleaning
the
air filter and warming up the engine.
Caution: Adjustment of the high speed adjusting screw
not only affects the
power output
but also the maximum
off-load engine speed. If the setting is too lean (screw
42
turned too far clockwise), the maximum permissible
engine
speed will be exceeded. This can cause
engine damage,
brought about by lack of lubrication and overheating in
particular. Corrections
to
the setting of the high speed
adjusting screw may be carried out only if an accurate
tachometer is available
to check
the
maximum
engine
speed
of
13,000 rpm (with bar and correctly tensioned
chain).
Basic
setting
If it is necessary to
readjust the carburetor again
from
the
beginning, first
carry out
the basic setting to obtain
a
starting point for fine adjustment. To do this, carefully
screw the two adjusting screws down onto their seats
(clockwise). Then make the following adjustment:
High speed adjusting
screw
H: back
off
1
complete turn
Low speed adjusting screw L: back off 1 complete turn
If
you
have
no
means of checking the
maximum engine
speed, do not set the high speed adjusting screw
any
leaner by turning it beyond the basic
setting.
Carburetor
1
= High speed adjusting
screw
2 = Low speed
adjusting
screw
3 = Idle speed
adjusting screw
Regulating idle speed
adjusting screw
1
VA
2
4.
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