Husqvarna 136 Installation guide

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English 1 (4)
SB, 136, 141, 55, 340, 345, 350, 346 XP, 353, 357 XP, 359,
395 XP, 3120 XP, 336, 339 XP, 334 T, 338 XPT,
Basic adjustment for EU 1, 2004-12
Basic adjustment for EU 1 models with carburettors equipped with caps to meet the EU (European
Union) emission regulations.
Carburettor with caps
This means that the chain saw is equipped with adjustment limiters (= caps) on the carburettors’
high speed (H) and low speed (L) adjusting needles. The purpose is to prevent the chain saw
operator from changing the setting to above EU allowed emission levels.
The caps limit the adjustment range to a maximum of 1/2 turn on both H- and L-needles.
Replacement of L- and/or H-speed needles or complete carburettor (1 and 2)
After replacing the carburettor or high speed and/or low speed needle on EU certified products, a
basic adjustment must be carried out as described below in order to meet the EU requirements.
This is to keep exhaust emissions within the requirements specified by EU.
This instruction is made for EU certified products only.
1. Replacement of L speed or/and H speed needles
The caps can be removed to achieve richer or leaner adjustments. This can be done with a pair of
cutting pliers pulling the caps from the needles or by using a caps removal tool (part no 531 03 05-
01 for Walbro two-stage limiter cap) or part no 531 03 03-98 for Zama caps.
2. Replacement of carburettor
To set the needles correctly an adjustment sleeve is fitted over the caps from the factory on spare
part carburettors to lock them in maximum allowed settings. On all carburettors be sure that both
caps are set to the rich side before fixing them to the needles.
NOTE 1: After April 2003 there is a different system for setting the speed on models 136/141. See SB B0400020.
NOTE 2: On the complete spare part carburettor, the L-needle is adjusted from the factory.
1/2
1/2
H
L

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Conditions during adjustments
• The air filter should be clean and the cylinder cover fitted when adjustments are made.
Note! Adjusting the carburettor with a dirty air filter will give a too lean fuel mixture the next time
the air filter is cleaned. This can result in serious damage to the engine.
• Mount, for this model, approved bar and chain combination (See Technical data in the
Operator’s manual).
Model Bar lenght ± 2” Model Bar lenght ± 2”
136/141 14” 359 16”
55 18 395 XP 24”
340/345/350/353 16” 3120 XP 28” (non adjustable fixed jet)
346 XP 16” 336/339 XP 15”
357 XP 16” 334 T/338 XPT 14”
• The chain should be tensioned until you can lift it ~5 mm/~0,2 inch from the bar.
• Mount a new air filter.
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Replacement of the H-needle or complete carburettor
1. Screw the new H-needle gently clockwise to closed position and then turn it counterclockwise
”A” turns.
Model Model
136/141 A = 2 359 A = 3/4
55 A = 1 1/4 395 XP A = 3/4
340/345/350/353 A = 3/4 3120 XP A = (non adjustable fixed jet)
346 XP A = 3/4 336/339 XP A = 1 1/2
357 XP A = 3/4 334 T/338 XPT A = 1 1/2
2. Check that:
The H-cap is adjusted to its richest setting. (Turned counterclockwise to stop.)
The cap is not fixed to the needle, it should rotate independently.
Adjust the L-cap to a center position (1/4 turn counterclockwise = minimum, 1/4 turn clockwise =
maximum).
3. Start the engine. If necessary, adjust the idling speed with the T-screw until the chain stops.
4. Adjust the H-needle to give a top speed of ”B” rpm. Use a tachometer.
Model Model
136/141 B = 12 000 359 B = 12 500
55 B = 12 000 395 XP B = 13 000
340/345/350/353 B = 12 000 3120 XP B = (non adjustable fixed jet)
346 XP B = 13 000 336/339 XP B = 12 500
357 XP B = 13 500 334 T/338 XPT B = 12 500
Use a narrow blade screwdriver (Ref.no. 531 00 48-63) and insert it through the hole in the cap
(max. blade width 2 mm/0.08 inch)
5. Let the engine run at ”B” rpm ~ 1 minute, until warm.
6. Adjust the H-needle to a top speed of ”C” rpm.
Model Model
136/141 C = 13 500 359 C = 13 100
55 C = 12 500 395 XP C = 12 500
340/345/350/353 C = 12 700 3120 XP C = (non adjustable fixed jet)
346 XP C = 14 300 336/339 XP C = 13 100
357 XP C = 14 000 334 T/338 XPT C = 12 900
7. Check that the H-cap is still adjusted to its richest setting. (Turned counterclockwise to stop).
NOTE! The H-needle must not rotate!
8. Gently knock the H-cap into position. Use a 5 mm/0.2 inch mandrel (for ex. the locking pin for
the bevel gear ref.no. 502 02 61-03). This is a basic carburettor adjustment. Further fine
adjustments, within the limits the caps allow, may be necessary to achieve optimum
performance. See the Operator’s manual.
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Replacement of the L-needle
1. Take off the cap from the L-needle using e.g. a pair of cutting pliers and unscrew the needle.
2. Screw the new L-needle clockwise to closed position and then turn it counterclockwise ”D” turns.
Model Model
136/141 D = 1 1/2 359 D = 1 1/2
55 D = 1 1/4 395 XP D = 1 1/2
340/345/350/353 D = 1 1/2 3120 XP D = 1 (non adjustable fixed jet)
346 XP D = 1 1/2 336/339 XP D = 1 1/4
357 XP D = 1 1/2 334 T/338 XPT D = 1 1/4
* For the model 3120XP there is no cap on the L-needle, adjustment according to 3 - 9 should
therefore not be done.
3. Press a new L-cap on the L-needle to the first stop, which means that the cap is not fixed to the
needle, it should rotate independently.
4. Adjust the L-cap to the richest position (turned counterclockwise to stop) without turning the
needle.
5. Let the engine run at ~ ”E” app.1 minute until warm and then let it run on idle.
Model Model
136/141 E = 13 200 359 E = 12 500
55 E = 12 000 395 XP E = 12 000
340/345/350/353 E = 12 700 3120 XP E = (non adjustable fixed jet)
346 XP E = 13 000 336/339 XP E = 12 500
357 XP E = 13 500 334 T/338 XPT E = 12 500
6. Adjust the idle speed with the idle speed screw (T) to ”F” rpm.
Model Model
136/141 F = 3 000 359 F = 2 700
55 F = 2 600 395 XP F = 2 500
340/345/350/353 F = 2 700 3120 XP F = (non adjustable fixed jet)
346 XP F = 2 700 336/339 XP F = 2 800
357 XP F = 2 700 334 T/338 XPT F = 2 800
7. Adjust the L- needle until the highest possible idling speed is achieved and then turn the L-
needle 1/2 turn counterclockwise. Use a narrow blade screwdriver w. ith ref.no. 531 00 48-63
and insert through the hole in the cap (max. blade width 2 mm/0.08 inch). NOTE! If the chain
rotates, turn the idling speed screw (T) counterclockwise until the chain stops.
8. Check that the L-cap is still adjusted to its richest position. (Turned counter- clockwise to stop).
NOTE! The L-needle must not rotate!
9. Gently knock the L-cap into position. Use a 5 mm/0.2 inch mandrel (for ex. the locking pin for the
bevel gear ref.no. 502 02 61-03). This is a basic carburettor adjustment. Further fine
adjustments, within the limits the caps allow, may be necessary to achieve optimum
performance. See the Operator’s manual.
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