Carburettor In E-Tech And Carb-Epa Designs; After Replacing The Complete Carburettor; After Replacing Only The H Needle - Husqvarna 322 Workshop Manual

After replacing the complete carburettor

1. Check that the plastic sleeve on the H needle is turned as
far as possible anticlockwise (richest fuel mixture). The
sleeve sits freely on the needle and can be turned without
affecting the needle's setting.
Do not change the L needle setting. This is adjusted at the
factory and the plastic sleeve is already fixed on the needle.
2. Fit four trimmer cords Ø 3.3 mm on a Trimmy Fix M10,
531 00 38-69 for models 322L, 322R, 325L, 325L-X, 325R-X.
Maybe the hole needs to be enlarged a little to make fitting
the trimmer cords easier.
3. Cut the trimmer cord to the right length (measure the length
to the edge of the Trimmy Fix).
Model 322L/R, 325L/L-X/R-X: 142 mm
Fit the Trimmy Fix on the machine.
Model 322C should be used with Trimmy Hit VI and its
standard cord (Ø 2.0 mm). Cut the cord ends so that they
are 146 mm long.
4. Start the engine. Adjust the idling speed T screw if neces-
sary.
5. Use screwdriver 531 00 48-63 to adjust the H needle. The
blade is 2 mm wide and goes through the plastic sleeve
and only adjusts the needle.
Adjust the H needle so that the max. speed 8400 ±
200 r/min is set.
Use the tachometer 502 71 14-01 to check the speed.
531 00 48-63
6. Run the engine warm for 2–3 minutes.
7. Check that the max speed is still 8400 ± 200 r/min. Adjust
the H needle if necessary.
8. Check that the plastic sleeve on the H needle is still turned
as far as possible anticlockwise (richest fuel mixture).
9. Press in the plastic sleeve using a punch (Ø 5 mm).
The basic setting of the carburettor is now complete. Further
fine adjustment, within the limits that the plastic sleeves on the
needles permit, can be necessary.
Fuel system

Carburettor in E-TECH and CARB-EPA designs

(CARB-EPA only applies in the USA)
On this type of carburettor the H and L needles can be adjusted within extremely
tight limits to, amongst others, comply with stringent demands with regard to the
hydrocarbon and nitrogen oxide content in the exhaust fumes.
The needles on these carburettors are fitted with plastic sleeves with limiters.
The engine must be loaded when making adjustments after replacing the needles
or the entire carburettor. This is achieved by fitting a Trimmy Fix with a trimming
cord of a specific length and diameter. The stated speed is then a great deal lower
than with "normal" carburettor adjustment when the engine runs unloaded at max
speed.
Adjustment must be carried out according to the instructions below after replacing
the needles or the entire carburettor on a CARB-EPA approved engine.
The Combi-guard or the spray guard must be fitted when adjusting the H needle.

After replacing only the H needle

1. Turn the L needle as far as possible anticlockwise (richest
2. Remove the plastic sleeve on the H needle and unscrew the
3. Carefully screw in the new H needle to the bottom and then
4. Press a new plastic sleeve on the H needle down to the first
5. Turn the plastic sleeve as far as possible anticlockwise
6. Fit four trimmer cords Ø 3.3 mm on a Trimmy Fix M10,
7. Cut the trimmer cord to the right length (measure the length
8. Start the engine. Adjust the idling speed T screw if necessary.
9. Use screwdriver 531 00 48-63 to adjust the H needle. The
502 71 14-01
10. Run the engine warm for 2–3 minutes.
11. Check that the max speed is still 8400 ± 200 r/min. Adjust
12. Check that the plastic sleeve on the H needle is still turned
13. Press in the plastic sleeve using a punch (Ø 5 mm).
The basic setting of the carburettor is now complete. Further
fine adjustment, within the limits that the plastic sleeves on the
needles permit, can be necessary.
fuel mixture).
needle.
loosen it 2 1/2 turns.
stop. The sleeve can now be turned without turning the needle.
(richest fuel mixture) without turning the needle.
531 00 38-69 for models 322L, 322R, 325L, 325L-X, 325R-X.
Maybe the hole needs to be enlarged a little to make fitting
the trimmer cords easier.
to the edge of the Trimmy Fix).
Model 322L/R, 325L/L-X/R-X: 142 mm
Fit Trimmy Fix on the machine.
Model 322C should be used with Trimmy Hit VI and its
standard cord (Ø 2.0 mm). Cut the cord ends so that they
are 146 mm long.
blade is 2 mm wide and goes through the plastic sleeve and
only adjusts the needle.
Adjust the H needle so that the max. speed 8400 ±
200 r/min is set.
Use the tachometer 502 71 14-01 to check the speed.
531 00 48-63
the H needle if necessary.
as far as possible anticlockwise (richest fuel mixture).
3
502 71 14-01
17