Manual Al-ko AL-KO 142 (page 37 of 124) (English, German, Dutch, French, Italian, Spanish)

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Operating and maintenance instructions

ENGLISH 17

9.4 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!

9.5 Air filter maintenance

Contaminated air filters cause a reduction in engine

performance and increase fuel consumption with

more pollutants in the exhaust gas. Engines are less

likely to start readily with a contaminated air filter.

Carry out the following maintenance jobs regularly.

Before opening the air filter, close the choke to

prevent dirt entering the carburettor.

• Turn the wing screw (32) at the air filter cover (11)

anti-clockwise.

• Flip the top of the air filter cover forward and

remove.

• Remove the fabric air filter (33).

• Clean the area around the filter.

When using the equipment all day, clean the fabric air

filter daily. Under extremely dusty conditions, clean

the filter several times during the day as well.

Simply tapping the filter is the best cleaning method.

Never wash or clean the air filter with heigh

compressed air or by wetting it; never place in an

oil bath or into cleaning solution.

The air filter is blocked, if the engine speed noticeably

drops when the carburettor is correctly adjusted.

Under these circumstances, the filter needs replacing

(part no. 20 48 154).

Low engine speed due to a blocked air filter must

never be compensated by incorrect carburettor

adjustments. This would cause the engine to

overload, resulting in severe engine failure.

Engine failure caused by incorrect care is excluded

from our warranty.

• Insert the new or cleaned fabric air filter into the

casing.

• Position the air filter lid with the lower guiding pins

onto the housing and push into place.

• Secure the filter cover by turning the wing screw

(32) clockwise.

Fig. 20

Fig. 21

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Al-ko AL-KO 142 Manual

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