MAINTENANCE
Carburetor
Your Husqvarna product has been designed and manufactured to specifications that reduce harmful emissions.
After your unit has been run
Functioning, Basic setting, Final setting
WARNING! Do not start the saw without the bar, chain and clutch cover (chain brake) assembled. If you do, the clutch might come loose and cause severe injuries.
Operation
•The carburetor governs the engine speed via the throttle. Air/ fuel are mixed in the carburetor. The air/fuel mixture is adjustable. To take advantage of the engine’s optimal output the setting must be correct.
•The setting of the carburetor means that the engine is adapted to local conditions, for example, the climate, altitude, fuel and the type of
• The carburetor has three adjustment possibilities:
L = Low speed jet. H = High speed jet.
T = Adjustment screw for idling.
•The fuel quantity required in relation to the air flow, provided by opening the throttle, is adjusted by the L and
•The T screw regulates the idling speed. If the screw T is turned clockwise this gives a higher idling speed; counter- clockwise a lower idling speed.
Basic setting and running in
The carburetor is set to its basic setting when test run at the factory. The basic setting is richer than the optimal setting and should be kept during the machine‘s first working hours. Thereafter the carburetor should be finely adjusted. Fine adjustment should be carried out by a skilled technician.
NOTE! If the chain rotates while idling the T screw should be adjusted
Recommended idling speed: 2 500 rpm.
Contact your servicing dealer, if the idle speed setting cannot be adjusted so that the chain stops. Do not use the saw until it has been properly adjusted or repaired.
Fine adjustment
•When the saw has been
Conditions
•Before any adjustments are made the air filter should be clean and the cylinder cowling fitted. Adjusting the carburetor while a dirty air filter is in use will result in a leaner mixture when the filter is finally cleaned. This can give rise to serious engine damage.
•Carefully turn the L and H needle to the mid point.
•Do not attempt to adjust the needles beyond the stops as damage can occur.
•Now start the saw according to the starting instructions and run it warm for 10 minutes.
NOTE! If the chain rotates the T screw should be turned
•Place the saw on a flat surface so that the bar points away from you and so that the bar and chain do not come into contact with the surface or other objects.
Low speed needle L
Turn the low speed needle L clockwise until the stop. If the engine has bad acceleration or erratic idling, turn the L needle
NOTE! If the chain rotates in the idling position, turn the idling speed screw
Final setting of the idling speed T
Adjust the idling speed with the screw T. If it is necessary to re- adjust, first turn the idle speed adjusting screw T clockwise, until the chain starts to rotate. Then turn,
Contact your servicing dealer, if the idle speed setting cannot be adjusted so that the chain stops. Do not use the saw until it has been properly adjusted or repaired.
High speed needle H |
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The high speed needle H |
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influences the power of the |
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saw. A too lean adjusted high |
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speed needle H (high speed |
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needle H closed too much) |
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gives overrevs and damages |
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the engine. Turn the high |
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speed needle H counter- |
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clockwise until the stop. If the |
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engine runs roughly, turn the | H |
high speed needle slowly the | |
minimum amount clockwise |
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until the engine runs smoothly. |
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The high speed needle H is correctly set when the saw ”4- cycles” a little. If the saw ”whistles” the setting is too lean. If there is too much exhaust gas at the same time as the saw ”4- cycles” much, the setting is too rich. Turn the high speed needle H until the setting sounds correct. NOTE! For optimum setting of the carburetor, contact a qualified servicing dealer who has a revolution counter at his disposal.
Correctly adjusted carburetor
A correctly adjusted carburetor means that the saw accelerates without hesitation and the saw
English – 29
