Bedienungsanleitung Al-ko AL-KO 137 SB (Seite 36 von 124) (Deutsch, Englisch, Holländisch, Französisch, Italienisch, Spanisch)

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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

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