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STIHL 029, 039
67
If the saw is used at high altitudes
(mountains) or near sea level:
A slight correction
may
be necessary.
For corrections to high speed adjusting
screw
(H)
:
Use a tachometer - do not exceed
maximum permissible engine speed.
Engine can be damaged by lack of
lubricant and overheating.
Maximum engine speed with bar and
properly tensioned chain: 13,000 r.p.m.
- Check chain tension
- Check air filter and clean
if necessary
- Adjust idle speed correctly
(chain must not rotate)
- Start the saw -
warm up the engine
Turn high speed adjusting
screw
(H)
and low speed adjusting
screw
(L)
clockwise for leaner
mixture at high altitudes or counter-
clockwise for richer mixture at sea level.
Turn screws very slowly and
carefully - even slight adjustment
produce a noticeable change in
engine running behavior.
Chain runs while engine is idling
Turn the idle speed adjusting screw
(LA)
counterclockwise until the chain
stops running - and then turn about
another quarter turn in the same
direction.
Erratic idling behavior, poor
acceleration
Idle setting too lean.
Turn the low speed adjusting screw
(L)
counterclockwise until the
engine runs and accelerates
smoothly.
Exhaust smokes at idle speed
Idle setting too rich. Turn the low
speed adjusting screw
(L)
clockwise
until the engine speed drops - and
then turn it back one quarter turn -
and check that the engine
accelerates smoothly when you open
the throttle.
Corrections to high speed adjusting
screw:
The setting of the high speed adjusting
screw
(H)
affects the maximum off-load
engine speed. If the setting is too lean,
the maximum permissible engine speed
will be exceeded and increase the risk
of engine damage.
Adjusting engine idle speed:
A correction at the low speed
(L)
usually necessitates a change in the
setting of the idle speed adjusting screw
(LA)
.
Engine stops while idling
Turn idle speed adjusting screw
(LA)
clockwise until the chain begins to
run - then turn it back one quarter turn.