Operator's manual - Jonsered

MAINTENANCECarburetorAdjusting the idle speedThe T-screw regulates the throttle setting at idle speed. If theT-screw is turned clockwise this gives a higher idle speed;turning it anti-clockwise gives a lower idle speed.Before any adjustments are made, make sure that the air filteris clean and the air filter cover is fitted.Adjust the idle speed with the idle adjustment screw T, ifadjustment is necessary. First turn the idle adjustment screwT clockwise until the blades start to move. Then turn the idleadjustment screw T anticlockwise until the blades stop. Theidle speed is correctly adjusted when the engine runssmoothly in every position. There should also be a clearmargin to the speed at which the blades start to move. Theblades must also remain stationary when the choke control isin the start throttle position.On mufflers without a catalytic converter the screen should becleaned weekly, or replaced if necessary. On mufflers fittedwith a catalytic converter the screen should be checked, andif necessary cleaned, monthly. If the screen is damaged itshould be replaced. If the screen is frequently blocked, thiscan be a sign that the performance of the catalytic converteris impaired. Contact your dealer to inspect the muffler. Ablocked screen will cause the machine to overheat and resultin damage to the cylinder and piston. See also instructionsunder the heading Maintenance.CAUTION! Never use a machine with a defective muffler.!WARNING! Mufflers fitted with catalyticconverters get very hot during use andremain so for some time after stopping. Thisalso applies at idle speed. Contact can resultin burns to the skin. Remember the risk offire!Cooling systemTo keep the working temperature as low as possible themachine is equipped with a cooling system.!WARNING! If the idle speed cannot beadjusted so that the cutting attachmentstops, contact your dealer/serviceworkshop. Do not use the machine until ithas been correctly adjusted or repaired.21MufflerThe cooling system consists of:CAUTION! Some mufflers are fitted with a catalyticconverter. See chapter on Technical data to see whether yourmachine is fitted with a catalytic converter.The muffler is designed to reduce the noise level and to directthe exhaust gases away from the operator. The exhaustgases are hot and can contain sparks, which may cause fireif directed against dry and combustible material.1 Cooling fins on the cylinder.2 Cylinder cover (directs cold air over the cylinder).Clean the cooling system with a brush once a week, moreoften in demanding conditions. A dirty or blocked coolingsystem results in the machine overheating which causesdamage to the piston and cylinder.Spark plugThe spark plug condition is influenced by:• Incorrect carburetor adjustment.Some mufflers are equipped with a special spark arrestorscreen. If your machine has this type of muffler, you shouldclean the screen at least once a week. This is best done witha wire brush.• An incorrect fuel mixture (too much or incorrect type ofoil).• A dirty air filter.These factors cause deposits on the spark plug electrodes,which may result in operating problems and startingdifficulties.English – 15