Dolmar PS-5105 H Manuale Utente

CAUTION:

Do not adjust the carburetor until the machine has been

completely assembled and checked! Do not adjust the

carburetor without a tachometer!
Carburetor adjustment is necessary for optimum engine

performance, for safer and more economical operation.

Adjust the carburetor only with the engine warm, a clean

air filter, and properly installed cutting tool.
Carburetor adjustment may be done only by a DOLMAR

service center. Improper adjustment can cause damage

to the engine.
In order to comply with new emissions legislation, limits have

been placed on the carburetor adjusting screws (H) and (L).
This limitation (to about 180 degrees) prevents an exces-

sively rich mixture. This in turn ensures compliance with

emissions rules as well as optimum engine performance and

economical fuel consumption.
You will need a tachometer (part No. 950 233 20) for op-

timum adjustment. Exceeding the maximum permissible

speed can lead to overheating and under-lubricating, and

damage to the engine!
Factory setting of adjusting screws (H) and (L): Turned out

almost all the way (counterclockwise).

Use a screwdriver (blade width 4 mm, part No. 944 340 00)

to adjust the screws.

For proper adjustment, proceed as follows:

Checking adjusting screw (H)
Before starting the engine make sure that adjusting screw (H) is

turned out counterclockwise until it reaches a noticeable stop.

The limitations do not prevent excessively lean running!
1. Start engine and let it warm up (3-5 minutes)

2. Set idle

3. Check acceleration

4. Set maximum permissible speed

5. Check idle speed

2. Set idle

Set the idle speed per the technical specifications.

Turning the adjusting screw (S) in (clockwise) increases the

idle speed. Turning it out (counter-clockwise) lowers the idle

speed. The cutting tool must not rotate!

3. Check acceleration

When the throttle is pressed, the engine should go smoothly

from idle to high speed.

Turn adjusting screw (L) out (counterclockwise) in small

increments until acceleration is good.

Adjusting the carburetor

4. Set maximum permissible speed

Set the maximum speed by minimal adjustments of

the adjusting screw (H) in accordance with the tech-

nical specifications. Turning the adjusting screw (H)

clockwise increases the speed. Never exceed the

maximum permissible speed!

For units with electronic engine speed limitation:

No tachometer is necessary to determine the

maximum permissible speed, since exceeding

this speed will result in clearly audible ignition

misses!

5. Check idle speed

Check the idle speed after setting the top speed (the

cutting tool must not rotate!).

Repeat the adjustment procedure starting at Step 2,

until the engine runs with the correct idle speed, good

acceleration, and maximum permissible speed.