4
B0400066
SERVICE
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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