Q: How to adjust the carburetion of the DOLMAR PS-5105 chainsaw?

Before you begin , ensure that the engine is clean and free of debris. Wear appropriate protective equipment (gloves, safety glasses). The carburetion adjustment should be performed on a flat and stable surface. Most importantly, check that the chain does not rotate at idle: this is a crucial safety requirement. Your DOLMAR PS-5105 has three main adjustment screws: the S screw for idle, the L screw for low-speed acceleration, and the H screw for maximum speed. For optimal adjustment, start the engine and let it warm up for 3 to 5 minutes before beginning. Once the engine is warm, you can proceed with the adjustments. Idle adjustment (S screw) : Turn the S screw clockwise to increase the idle speed, or counterclockwise to decrease it. The engine should run smoothly and steadily. Important: the chain must absolutely not rotate at idle. If it does, reduce the idle with the S screw until it stops completely. Maximum speed adjustment (H screw) : Turn the H screw clockwise to increase the maximum speed. Adjust the H screw to the minimum according to the engine's technical specifications. Never exceed the maximum allowed speed. Once the maximum speed is reached, you will notice ignition interruptions: this indicates that the limit speed has been reached. Acceleration adjustment (L screw) : As soon as you operate the throttle, the engine should accelerate from idle to high speed without hesitation. Gradually unscrew the adjustment screw (L) by turning it counterclockwise until the engine accelerates well. After each adjustment, repeat the adjustment operations until you achieve a stable idle without chain rotation, smooth acceleration, and the correct maximum allowed speed. If you encounter difficulties or if the carburetor is clogged, consult an authorized DOLMAR dealer.

Question 1

What should I do if my DOLMAR HT2360D hedge trimmer won't start?

Accepted Answer

If your DOLMAR HT2360D hedge trimmer won't start, first check that you are following the correct procedure. Place the device on a clean surface, then push the I-O switch to the "I" position. Next, press the primer bulb gently 7 to 10 times until fuel enters the system. Then, set the choke lever to the closed position (important for a cold engine), hold the hedge trimmer firmly, and pull the starter handle slowly 10 to 15 cm until you feel resistance. Finally, pull the handle firmly despite the resistance to start the engine.

A common cause of failure to start is flooding the engine. If you have pulled the starter handle several times with the choke closed, the carburetor is flooded with fuel and the engine will not start easily. In this case, remove the spark plug (NGK CMR6A for the HT2360D) and gently pull the starter handle several times to remove the excess fuel. Make sure to dry the spark plug electrode well before reinserting it.

Also check the condition of the air filter. A clogged filter can prevent the engine from receiving enough air to operate correctly. Clean or replace the filter if necessary. Additionally, ensure that the fuel is correct: the HT2360D requires unleaded gasoline with a minimum octane rating of 91 RON, mixed with oil in a 50:1 ratio using original DOLMAR oil. An improper mixture or contaminated gasoline will prevent starting.

Check the sealing of the spark plug. Remove it and check that it is not dirty, wet, or defective. If the electrode is black and covered with deposits, clean it with a fine wire brush. The gap between the electrodes should be 0.7 to 0.8 mm. If the spark plug is worn or damaged, replace it with a new NGK CMR6A.

If the engine remains without spark (no attempt to ignite), the problem lies with the ignition system. Check that the I-O switch is functioning correctly, that the spark plug connector is not loose, and that there is no damaged wiring. A defective ignition module will require professional intervention. If the engine starts but immediately stalls, the problem often comes from a contaminated WALBRO WYL type carburetor that needs cleaning or an incorrect idle adjustment.

After several unsuccessful attempts, let the engine rest for a few minutes to avoid overheating. For a hot start (immediate restart after stopping), use steps 1, 2, 4, 5, and 6 of the usual procedure but with the choke lever in the open position. If the problem persists despite these checks, consult an authorized DOLMAR professional for a complete diagnosis of the ignition or compression system.

Question 2

How to adjust the carburetion of the DOLMAR PS-5105 chainsaw?

Accepted Answer

Before you begin, ensure that the engine is clean and free of debris. Wear appropriate protective equipment (gloves, safety glasses). The carburetion adjustment should be performed on a flat and stable surface. Most importantly, check that the chain does not rotate at idle: this is a crucial safety requirement.

Your DOLMAR PS-5105 has three main adjustment screws: the S screw for idle, the L screw for low-speed acceleration, and the H screw for maximum speed. For optimal adjustment, start the engine and let it warm up for 3 to 5 minutes before beginning. Once the engine is warm, you can proceed with the adjustments.

Idle adjustment (S screw): Turn the S screw clockwise to increase the idle speed, or counterclockwise to decrease it. The engine should run smoothly and steadily. Important: the chain must absolutely not rotate at idle. If it does, reduce the idle with the S screw until it stops completely.

Maximum speed adjustment (H screw): Turn the H screw clockwise to increase the maximum speed. Adjust the H screw to the minimum according to the engine's technical specifications. Never exceed the maximum allowed speed. Once the maximum speed is reached, you will notice ignition interruptions: this indicates that the limit speed has been reached.

Acceleration adjustment (L screw): As soon as you operate the throttle, the engine should accelerate from idle to high speed without hesitation. Gradually unscrew the adjustment screw (L) by turning it counterclockwise until the engine accelerates well.

After each adjustment, repeat the adjustment operations until you achieve a stable idle without chain rotation, smooth acceleration, and the correct maximum allowed speed. If you encounter difficulties or if the carburetor is clogged, consult an authorized DOLMAR dealer.

Question 3

Where is the start button on the DOLMAR PS-6400 chainsaw?

Accepted Answer

On the DOLMAR PS-6400 chainsaw, there is no single start button but rather a starting system made up of several elements located on the side and top of the device. The I/STOP ignition switch (16) is located on the side of the machine and must first be toggled to activate the ignition. The choke lever (17) is located right next to it and is pulled manually until it audibly clicks into place. The start handle (14) that operates the starting cable is also located on the side of the chainsaw.

To start cold, follow this precise procedure:

Place the chainsaw on stable ground and ensure that the chain does not come into contact with any objects.
Push the I/STOP switch from the OFF position to ON to activate the ignition system.
Pull the choke lever until you hear a click confirming it is engaged. This simultaneously activates the semi-automatic throttle governor.
Press the decompression valve (13) if your model is equipped with one to facilitate starting.
Pull firmly on the start handle until you feel resistance, then continue to pull slowly and gradually. Do not pull the cable out more than 50 cm and always gently return it by hand to avoid damaging the mechanism.
As soon as the engine starts, push the choke lever down and hold the rear handle (which releases the governor and allows the engine to run at idle).

For a hot restart, use the same procedure but briefly pull the choke lever (back and forth once) before pulling the start handle, as the engine only needs minimal enrichment of the mixture.

Refer to the complete user manual for more details on carburetor adjustments and essential safety procedures before starting your DOLMAR PS-6400.

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