Husqvarna 555 Workshop Manual page 40

7.14.5 To disassemble the carburetor
1. Remove the carburetor. Refer to
install the carburetor on page 36 .
2. Remove the 4 screws (A) from the metering cover
(B).
3. Remove the gasket (C), the metering diaphragm (D),
the control diaphragm (E) and the gasket (F).
4. Remove the screw (G), the needle valve (J), the
metering lever (H), the metering lever pin (I) and the
spring (K).
5. Remove the 2 screws (L).
6. Remove the air filter holder assembly (M).
7. Remove the screw (N) and the fuel pump cover (O).
8. Remove the gasket (P), the boost diaphragm (Q)
and the pump diaphragm (R).
9. Remove the fuel screen (S).
7.14.6 To clean and examine the carburetor
1. Clean all parts in clean gasoline. Use compressed
air to dry the gasoline. Point the air through all
channels in the carburetor housing and make sure
that the channels are not blocked.
2. Make sure that there is no play on the throttle valve
and the shafts of the choke valve.
3. Examine all parts for damage and wear. Replace the
parts that show sign of damage.
4. Use the Engine Diagnostic Tool to examine the
™
AutoTune unit. Refer to
7.14.7 To assemble the carburetor
CAUTION: Assemble the carburetor in a clean
environment. Contamination can cause damage
to the product.
Note: When you replace the carburetor, a firmware
download is necessary on the new carburetor. With the
firmware installed, the carburetor must be approved on
the test "autotest" in the CST before use. Refer to the
CST for instructions.
1. Lubricate the shaft bearings with two-stroke oil.
2. Attach the fuel screen (S). Use the handle of a small
screwdriver.
3. Assemble the pump diaphragm (R), the boost
diaphragm (Q), the gasket (P) and the fuel pump
cover (O) to the carburetor with the screw (N).
4. Attach the 2 screws (L) to the air filter holder
assembly (M).
40 - Repair instructions
To remove and
Servicing tools on page 9 .
5. Assemble the needle valve (J) and the metering
lever (H), the metering lever pin (I) and the spring
(K). Tighten the screw (G).
6. Measure the distance between the metering lever
(H) and the gasket surface of the carburetor
Servicing tools on page 9 . The
housing. Refer to
distance must be 0.55 mm. If it is more or less than
0.55 mm, adjust the distance. Refer to
metering lever on page 41 .
7. Assemble the gasket (C), the metering diaphragm
(D), the control diaphragm (E), and the gasket (F) on
the carburetor housing. Make sure that you
assemble the parts in the correct sequence.
8. Attach the metering cover (B) to the carburetor
housing.
9. Do a pressure test of the carburetor. Refer to
a pressure test of the carburetor on page 41 .
10. On 555 and 556: Attach the 4 screws and washers
(A) and tighten the screws.
11. On 560 XP and 560 XPG: Assemble the heating
element on the carburetor. Attach the 4 screws and
washers (A) and tighten the screws.
To adjust the
To do
1540 - 001 -