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this situation, you must extract and dry up the spark plug
(12) wet with gasoline before starting. Wait a short while
before again putting in the spark plug (12) to allow the
cylinder become dry from gasoline.
Warm start
1. Actívate the machine’s starter switch (15).
2. Check that the mechanical brake (4) is deactivated. To
do so, check that the white-colored plastic piece in the
base is thrust in. lf not so, pull the brake handle towards
yourself such that the brake (4) is deactivated.
3. Grasp the machine firmly and avoid any obstacles
being present around the machine. Comply with the
safety measure before starting.
4. Pull the starter handle (14) vigorously. Under normal
conditions, the machine will start at the first attempt.
IMPORTANT:
lf the fuel tank (19) has been completely
emptied due to lack of fuel, press the priming pump (22)
until gasoline appears in the primer bulb (22).
Turning the machine off
Put the circuit breaker switch (15) in position “STOP”.
Checking the saw chain brake
Do not work with the chain saw without having
previously checked the saw chain brake!
Start the engine as described (make sure that the soil
on which you are stepping is stable, and place the chain
saw on the soil such that the guide bar does not touch
anything).
Grasp the tubular handle (13) firmly with one
hand and hold the rear handle (1) with the other.
With the motor running at moderate speed,
push the hand guard (4) with the rear portion of
your hand until actuating the saw chain brake
(4). The saw chain (5) must stop immediately.
lmmediately release the accelerator and release the saw
chain brake.
IMPORTANT: lf the saw chain does not stop
immediately in this test, do not proceed with the work
under any circumstances. Contact a STAYER Service
Center.
ALERT:
Do not remain a long time checking the brake (4)
risk of burning the friction system.
Adjusting the engine speed
The motor is perfectly adjusted ex works. As time goes
by, it might need small adjustments.
The engine speed increases upon rotating the adjusting
screw to the right.
Rotating to the left, the engine speed is reduced.
Mixture richness adjusting screw
“H” (27)
at high speed
Mixture richness adjusting screw
“L” (28)
at low speed
ldling adjusting screw
“T” (29)
Adjusting the carburetor
- The equipment is adjusted ex works. Only proceed to
adjusting after having discarded other possible causes
such as dirty filters, exhaust pipe full of carbon deposits,
spark plug in bad condition or low-quality gasoline or
excessive or scarce mixture with oil.
- Before adjusting, fill half of the tank and let the machine
warm up keeping it running without load for 5 minutes.
Adjusting low engine speed:
WARNING
: lt is recommended to adjust the machine at a
technical service.
Adjust the revolutions at idling speed by means of screw
T (29).
Adjust the richness at idling speed acting on L until a
relieved speed is achieved without reaching the highest
speed limit for the previously adjusted position T.
Readjust position T if by acting on L if revolutions rise too
much. The final result will be a sound that must be clean
but not shrill but with a small roaring. Once adjusted, the
machine will start easily and will not get stalled when it is
accelerated.
Release the brake and check that the chain does not rotate
at idling speed. Never allow the saw to rotate at idling
speed. The consequence is a severe risk of accident and
of burning the mechanical brake group with fire hazard. lf
you note that the saw rotales at idling speed, reduce the
revolutions until it does not move anymore and repeat the
adjusting process.
Adjusting high engine speed:
Only proceed to this after having adjusted the machine
at low revolutions. When pressing the accelerator to
the maximum, act on screw H (27) until achieving high
revolutions but without ever reaching the maximum. Once
you hear the highest revolutions (clean and sharp scarce
gasoline mixture sound), adjust to reduce the revolutions
only a little until starting to hear a stronger and more low
pitched sound similar to roaring. Revise the low engine
speed adjustment to check that it has not changed due to
the high engine speed adjustment. The result is that the
machine revolutions will rise smoothly and quickly, that it
does not stall at idling speed and with much power and a
mínimum smoke emission.
Once adjustment of the low and high engine speed has
been made, the machine is adjusted and ready to work
at maximum power, maximum lifetime of the engine and
smallest consumption.
Warning:
Carbureting a very rich mixture will make the machine
malfunction, heating up excessively, with low power and
expelling much white smoke, filling ducts with carbon
deposits and generating beads (short circuit) at the spark
plug. Moreover, the sound will be that corresponding to
low revolutions, is ugly and irregular.
Carbureting a scarce mixture will cause the machine to
deliver very little power, to lubricate little and with rising
revolutions.
In these conditions, there is a severe risk of breakdowns
due to breakage of the pistan and of the crankshaft
bearing.
The sound is very accelerated, very shrill and dry
Cleaning the air filter
(OLMO G1-250C, OLMO G2-400B, OLMO G3-450C)
Unscrew the screw (23) and extract the cover of the filter
box (20).
