Makita DCS 6400 Owner's And Safety Manual

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Makita DCS 6400 Owner's And Safety Manual Manual pdf 25 page image

Adjusting the carburetorImportant information:The carburetor of this tool is fitted with limiter caps which restrictthe range of adjustmentand prevents over-rich mixture settings.This ensures providing good engine power and efficient fuelconsumption. Before installingthe limiter caps, the manufacturerperforms the "Basic Setting" procedure.Carburetor adjustment is necessary for optimum engineperformance, for safer and more economical operation.The engine should be warm, the air filter clean, and thechain properly tensioned. Have carburetor adjustmentdone by an authorised MAKITA service centre.The carburetor is factory-adjusted for the air pressure at sealevel. At other elevations or under other conditions of weather,temperature, or humidity, or when breaking in a new engine, itmay be necessaryto make slight adjustmentsto the carburetor.You will need a tachometer (9, part No. 950 233 210) foroptimum adjustment.Do not go below the specified basic setting of the mainnozzle (H). Doing so may cause engine damage due tooverheating and insufficient lubrication!Use the supplied carburetor screwdriver (8) for carburetoradjustment. It has a moulded-on projectionthat aids in adjusting.Before undertaking the adjustcent, run the engine for 3-5minutes to warm it up, but not at high speed!For proper adjustment, proceed as follows:1. Basic setting (engine off)2. Set idle3. Check top speed4. Check acceleration5. Check idle speedStart engine and warm up.Repeat steps 2-5 until you get the right idle speed, goodacceleration and maximum permissibleCarefully turn the adjusting screw for the idle nozzle (L)clockwise until you feel a stop.Turn adjusting screw (L) 1 turns counter-clockwise.1. Basic settingL H2. Set idleSet the idle speed per the technical specifications.Turning the adjusting screw (S) in (clockwise) increasesthe idle speed. Turning it out (counter-clockwise)lowersthe idle speed. In no case should the chain move.The top speed in the governor can be clearly heard fromthe ignition misses. Important: To prevent enginedamage, never go more than a 114 turn in clockwisewith adjusting screw (H).Note: Since there is anelectronic speed governor (limiter) at 13,500 rpm thatcuts off the ignition current, the top speed cannot be readfrom the tachometer.4. Check acceleration3. Check top speedWhen the throttle is pressed, the engine should gosmoothly from idle to high speed. If this is too slow, turnthe adjusting screw (L)in small (max. 118 turns) incre-ments counter-clockwise.5. Check idle speedCheck the idle speed after setting the top speed (thechain must not move).Repeatthe adjustment procedure starting at Step 2, untilthe engine runs with the correct idle speed, goodacceleration, and top speed. kIWorking in winterIn order to prevent carburetor icing in conditions of lowtemperature combined with high humidity, and below + 5°C inorder to get up to operating temperature faster, heated air canbe taken from the cylinder.Remove the filter hood (see ,,Cleaning air filtef)Remove the insert (10) and insert it as shown in position B forAt temperatures above + 5°C the carburetor must NOT be fedheated air. Failure to follow these instructions can lead todamage to the cylinder and piston!At temperatures over +5"C place the insert in position A fornormal operation.Position A - Normal operation ,Position B $& - Cold-weather operationcold-weather operation. 1Reinstall the filter hood.nL5