Husqvarna 531RB Workshop Manual page 27

7.6.7 To clean and examine the carburetor
1. Clean the needle valve.
2. Examine the lever arm and the needle valve.
Replace damaged parts.
3. Examine the fuel hole of the needle jet and the main
nozzle.
4. Examine the metering chamber. If there is dirt in the
metering chamber, blow with compressed air and
then clean with clean oil.
5. Measure the height (A) of the lever arm and adjust
the height if it is necessary. Correct height is
4±0.5mm.
6. Examine the distance piece for damage. Replace
the distance piece if it is damaged.
7. Examine the remaining parts. Replace damaged
parts.
935 - 001 -
7.6.8 To adjust fuel flow to the carburetor
1. Disassemble the carburetor, refer to
and assemble the carburetor on page 25 .
2. To adjust the fuel flow for idle speed or middle
speed: Move the clip of the jet needle to the correct
position.
A
a) Move the clip to the top groove (A) for low fuel
flow.
b) Move the clip to the middle groove (B) for
standard fuel flow.
c) Move the clip to the bottom groove (C) for high
fuel flow.
3. To adjust the fuel flow for high speed: Replace the
main nozzle.
a) Use a smaller main nozzle to increase the fuel
flow.
b) Use a larger main nozzle to decrease the fuel
flow.
7.6.9 To adjust the idle speed
The idle speed is adjusted at the factory before the
product is supplied. An adjustment of the idle speed can
become necessary because of changes in the operation
conditions, for example, in the air.
WARNING: If the cutting attachment does not
stop when you adjust the idle speed, speak to
your servicing dealer. Do not use the product
until it is correctly adjusted or repaired.
To disassemble
A
C
B
Repair instructions- 27