Final setting of the idling speed T

MAINTENANCE

Adjust the idling speed with the screw T, if it is necessary to readjust. First turn the idle speed adjusting screw T clockwise until the cutting attachment starts to rotate/ move.

Then turn, counter-clockwise until the cutting attachment stops. A correctly adjusted idle speed setting occurs when the engine runs smoothly in every position. It should also be good margin to the rpm when the cutting attachment starts to rotate/move.

CAUTION! Contact your servicing dealer, if the idle speed setting cannot be adjusted so that the cutting attachment stops. Do not use the machine until it has been properly adjusted or repaired.

High speed needle H

The high speed needle

Hinﬂuences the power, speed, temperature and fuel consumption of the machine. A too lean adjusted high speed needle H (high speed needle H closed too much) gives overrevs and damages the engine. Do not let the machine run at full speed for more than 10 seconds.

Turn the high speed needle very slowly clockwise until engine speed is reduced. Thereafter turn the high speed needle very slowly counter- clockwise and stop when the engine begins to run roughly. Then turn the high speed needle slowly the minimum amount clockwise until the engine runs smoothly.

The high speed needle H is correctly set when the machine ”4-cycles” a little. If the machine ”whistles” the setting is too lean. If there is too much smoky exhaust gas at the same time as the machine ”4-cycles” much, the setting is too rich.

NOTE! For optimum setting of the carburettor, contact a qualiﬁed servicing dealer who has a revolution counter at his disposal.

Correctly adjusted carburettor

A correctly adjusted carburettor means that the machine accelerates without hesitation and the machine 4-cycles a little at max speed. Furthermore, the cutting attachment must not rotate/move at idling. A too lean adjusted low speed needle L may cause starting difﬁculties and bad acceleration.

A too lean adjusted high speed needle H gives lower power = less capacity, bad acceleration and/or damage to the engine. A too rich adjustment of the two speed needles L and H gives acceleration problems or too low working speed.

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