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MAINTENANCE
Carburetor
Your Husqvarna product has been designed and manufactured to specifications that reduce harmful emissions. After the engine has used
WARNING! The complete clutch cover and
!shaft must be fitted before the machine is started, otherwise the clutch can come loose and cause personal injury.
Function
•The carburetor governs the engine’s speed via the throttle control. Air and fuel are mixed in the carburetor. The air/ fuel mixture is adjustable. Correct adjustment is essential to get the best performance from the machine.
•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 controls: L = Low speed jet
H = High speed jet
T = Idle adjustment screw
•The L and
•The
Basic setting
•The basic carburetor settings are adjusted during testing at the factory. The basic setting is richer than the optimal setting and should be maintained for the first few hours the machine is in use. The carburettor should then be finely adjusted. Fine adjustment should be carried out by a skilled technician.
CAUTION! If the cutting attachment rotates when the engine is idling the idle adjustment screw T should be turned anti- clockwise until the cutting attachment stops.
Rec. idle speed 2700 rpm
Recommended max. speed: See the Technical data section.
WARNING! If the idle speed cannot be
!adjusted so that the cutting attachment stops, contact your dealer/service workshop. Do not use the machine until it has been correctly adjusted or repaired.
Fine adjustment
•When the machine has been
Conditions
•Before any adjustments are made, make sure that the air filter is clean and the air filter cover is fitted. If you adjust the carburettor when the air filter is dirty it will result in a leaner mixture when the filter is finally cleaned. This can lead to serious engine damage.
•Carefully turn both jets, L and H, so that they are midway between fully screwed in and fully screwed out.
•Do not attempt to adjust the L and H jets beyond either stop as this could cause damage.
•Now start the machine according to the starting instructions and let it warm up for 10 minutes.
CAUTION! If the cutting attachment rotates when the engine is idling the idle adjustment screw T should be turned
Low speed jet L
Try to find the highest idling speed, turning the low speed needle L clockwise respectively
+ 1/4
L
CAUTION! If the cutting attachment rotates when the engine is idling the idle adjustment screw T should be turned anti- clockwise until the cutting attachment stops.
Fine adjustment of the idle speed T
Adjust the idle speed using the idle adjustment screw T, if it is necessary to readjust. First turn the idle adjustment screw T clockwise until the cutting attachment starts to rotate. Then turn the screw anticlockwise until the cutting attachment stops. The idle speed is correctly adjusted when the engine
26 – English