Makita Chain Saw manual Stop, speed, Checking the safety chain brake, Adjusting the carburetor

Checking the safety chain brake

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Do not work with the saw without first checking the chain brake!

-Start the engine as described (make sure you have a good footing, and place the saw on the ground in such a way that the blade is free of contact).

-Grasp the tubular handle firmly with one hand and hold the grip with the other.

-With the engine running at moderate speed, press the hand guard (C/1) in the direction of the arrow with the back of your hand until the chain brake engages. The chain should stop immediately.

-Immediately release the throttle and release the chain brake.

IMPORTANT: If the chain does not stop immediately when you test the chain brake, do NOT use the saw! Take the saw to a MAKITA service center.

Adjusting the carburetor

CAUTION:

Optimum perfornance can only be achieved if the carbure- tor is adjusted correctly. For this work, which should be carried out by an expert, the engine must be warmed up for a period of 3-5 min. and the air filter must be clean.

The carburetor has been adjusted by MAKITA on the basis of atmosheric pressure conditions at sea level. Other atmospher- ic pressure conditions or the running-in process of a new engine may require readjustment of the carburetor.

It is urgently recommended to use a revolution indicator (O/1) (order number 950 233 210) in order to achieve a correct adjustment of the carburetor. Adjust the carburetor using a 4 mm screwdriver.

The screwdriver shown (O/2) (order number 944 340 001) has a molded-on lug to assist in adjustment.

For adjusting the carburetor correctly the following steps must be carried out:

1. Warm up engine

2.	Switch off engine	STOP
3.	Basic adjustment	2
4.	Start engine	1

5. Set idle speed

6.Adjust speed

7.Check idling speed

8.Check acceleration

9.Check max. speed or output

10.Repeat adjustment procedure starting with step 5, until idling speed, max. speed and acceleration are reached with the adjustment made.

Checking the chain lubrication

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Never work with the chain saw withoute sufficient chain lubrica- tion. Otherwise the service life of the chain and guide bar will be reduced.

Before starting work check the oil level in the tank and the oil feed. Check the oil feed rate as described below:

-Start the chain saw.

-Hold the running chain saw approx. 15 cm above a trunk or

the ground (use an appropriate base).

If the lubrication is sufficient, you will see a light oil trace because oil will be flung off the sawing device.

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O speed 4

STOP

Basic adjustment (step 3)

-First, carefully turn the 2 adjusting screws for the main jet (O/3) and the idle jet (O/4) to the right (clockwise) until you feel them stop.

-Now turn both screws one turn to the left (counter-clockwise).

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Set idle speed (step 5)

-If the chain turns when the engine is idling, unscrew the throttle-valve stop screw (O/speed) until the chain stops. If the engine runs unevenly, screw the screw (O/speed) back in.

-Idling speed should be 2,600 rpm.

Adjust speed (output) (step 6)

-Adjust the speed by adjusting the main jet screw (O/3) to 11,500 rpm (DCS 340, 341), 12,000 rpm (DCS 400, 401).

Check idle speed (item 7)

-After having adjusted the max. speed ensure the idle speed is set to 2,600 1rpm. (the chain must not turn). Use the idle jet screw (O/4) to regulate it. Turn in the screw (O/4) to speed up, and turn out the screw (O/4) to speed down the engine.

Check acceleration (item 8)

-Now check the acceleration, i. e. the time necessary for speeding up from idle speed to max. speed. To do this, press the throttle lever hard.

-If the acceleration is too low, turn out the idle jet screw (O/4) approx. 1/8 rotation.

Do not run the engine without load a high speed, open throttle fully only, if you are sawing!

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