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Al-ko AL-KO 137 SB Manual

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Operating and maintenance instructions
ENGLISH 16
8.3 Carburettor adjustment
The carburettor has been adjusted optimally at the
factory. Subject to the operational altitude
(mountains or low lying areas), the carburettor may
require readjustment.
The carburettor has 3 adjusting screws:
• Idling end-stop screw "T"
• Low speed mixture screw "L"
• High speed mixture screw "H"
Only qualified mechanics must adjust the regulating
screws for idle mixture "L" and full load mixture "H".
Turn the idling end-stop screw "T" to adjust the idling
speed in accordance with the details provided in the
specification. Use an engine rev counter for this job.
• If the idling speed is too high, turn the idling end-
stop screw "T" anti-clockwise.
• If the idling speed is too low (engine stops) turn
the idling end-stop screw "T" clockwise until the
engine runs smoothly.
With the throttle set to idle, the cutting tool
must not, under any circumstances, rotate!
If the idling speed cannot be set correctly with the
idling end-stop screw "T", request an authorised
service centre to tune the carburettor.
The following instructions are for authorised
service shops
D-CUT carburettors:
Use the D-CUT carburettor key to adjust the idle
mixture screw "L" and the full load mixture screw "H".
Carburettors with limiter caps:
The regulating screws for idle mixture and full load
mixture can only be adjusted in a limited range.
Clean the air filter before adjusting the low speed
screw.
Let the engine run warm before adjusting the engine
speed.
The carburettor is tuned for optimum engine
performance. Use a rev counter to tune the
carburettor correctly!
Do not adjust the engine to a higher speed.
Excessive engine speed can lead to major engine
damage!
8.4 Information about the spark plug
Check the spark plug regularly after 50 hours of
operation.
• Press the back tab of the spark plug cover (16)
down and remove in an upwards motion.
• Disconnect the spark plug cap.
• Unscrew the spark plug and dry the electrodes.
The spark plug should be replaced after 100 hours of
operation or if the electrodes are badly worn.
Do not turn the engine over while the spark plug has
been removed or the spark plug cap has been
disconnected from the high-tension ignition cable. A
spark may cause a fire!
Spark plugs with resistor (thermal value 200) are
available in different brands under the following
description:
BOSCH WSR6F
CHAMPION RCJ-6Y or comparable.
The correct electrode gap is 0.5 mm.
Only use spark plugs, where the contact nut has
been firmly fitted. Loose connectors may produce
sparks, which can cause a fire. Before restarting the
engine, check the high-tension ignition cable for any
damage to its insulation and ensure the cable is
connected securely to the plug cap
• Insert the spark plug into the cylinder head and
tighten it.
• Push the spark plug cap firmly over the spark plug.
• Position the spark plug cover onto the housing by
aligning it with the guiding pins, push down and
click into place.
Fig. 18
Fig. 19
… 36 …


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