Husqvarna 525HE3 Workshop Manual page 22

15. Assemble in the opposite sequence. Make sure that
the distance (A) between the surface of metering
chamber (B) and the metering lever (C) is 1.65±0.16
mm.
16. Do a pressure test of the carburetor before you
install it on the product. Refer to
test of the carburetor on page 22 .
6.7.5 To adjust the carburetor
To adjust the carburetor means that you adjust the
engine to the local conditions such as weather, altitude
and fuel.
The carburetor has 3 adjustment controls.
• L = low speed needle
• H = high speed needle
• T = idle speed screw
The low speed needle and the high speed needle adjust
the fuel flow to align with the airflow from the throttle
valve opening. Turn the low speed needle and high
speed needle clockwise to decrease the quantity of fuel.
Turn the low speed needle and high speed needle
counterclockwise to increase the quantity of fuel. Less
fuel increases the engine speed and a more fuel
decreases the engine speed.
Note: Always start with the low speed needle when you
adjust the carburetor.
The idle speed screw controls the throttle position. Turn
the idle speed screw clockwise to increase the idle
speed, turn it counterclockwise to decrease the idle
speed.
The high speed needle and the low speed needle in the
carburetor can only be adjusted with the special tool.
Servicing tools on page 11 .
Refer to
Turn the low speed needle and the high speed needle
clockwise to a stop. Turn counterclockwise to start the
adjustment.
22 - Repair instructions
C A B
To do a pressure
To adjust the carburetor, use the RPM measuring tool.
Servicing tools on page 11 . For recommended
Refer to
Technical data on page 44 .
settings, refer to
L
H
Basic factory settings
525HE3, 525HE4
H = high speed jet
L = low speed jet
6.7.6 To do a pressure test of the carburetor
1. Remove the carburetor. Refer to
install the carburetor on page 18 .
2. Make sure that the carburetor is correctly
assembled. Refer to
the carburetor on page 20 .
3. Connect the pressure tester to the fuel inlet on the
carburetor. Increase the pressure to 50kPa. Refer to
Servicing tools on page 11 .
T
2.2 turns
2.2 turns
To remove and
To disassemble and assemble
1371 - 001 - 02.07.2020