MAINTENANCE
Carburetor
Your Jonsered product has been designed and manufactured to specifications that reduce harmful exhaust fumes. The engine will be run in after it 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
Rec. idle 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 anti- clockwise until the cutting attachment stops.
Low speed jet L
Try to find the highest idling speed, turning the low speed needle L clockwise respectively
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.
26 – English