Technical Information · issue 32 of 2009
Carburetor; New Fanwheel; Blower Housing
IssueTI 32/2009
Part changes (1)
| Was | Becomes | What the bulletin says |
|---|---|---|
| 4241 704 3400 | 4241 704 3405 | New Fanwheel BG 56, BG 86, SH 56, SH 86 The previous fanwheel 4241 704 3400 will be replaced by the new fanwheel 4241 704 3405. |
Full text
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STIH)
Technical Information 32.2009
STIHL BG 56, BG 66, BG 86 Blowers – Series 4241
STIHL SH 56, SH 86 Shredder Vacuums – Series 4241
Contents
1. Carburetor
2. New Fanwheel
3. Blower Housing
1. Carburetor
Changes to optimize carburetor function have been The geometry of the tips of the high speed screw (H)
implemented into the manufacturing process. and low speed screw (L) have also been changed.
The new, modified carburetors can be identified by The changes have no influence on the function or
the index letter of the designation engraved on the adjustment of the previous and new carburetors.
carburetor body.
X XXX D
D
298TI005 KN
TI_32_2009_30_01_01.fm englisch / English
)m~ge 2 Technical Information 32.2009
1.1 Overview of changes BG 86, SH 86 – Carburetor 4241 120 0600
The installation of high speed screw (H)
BG 56, SH 56 – Carburetor 4241 120 0601 4241 122 6702 and low speed screw (L)
4140 122 6800 with modified geometry coincides
The installation of high speed screw (H) with the change in carburetor designation to C1M-
4241 122 6703 and low speed screw (L) S141D.
4241 122 6803 with modified geometry coincides
with the change in carburetor designation to The new adjusting screws can also be used in older
C1M-S142D. carburetors.
The new adjusting screws can also be used in older The previous low speed screw (L) 4241 122 6800 is
carburetors. no longer available as a replacement part.
BG 66 – Carburetor 4241 120 0602
Carburetors with the designation C1M-S144B are
technically the same as carburetors C1M-S141D for
BG 86, SH 86 and C1M-S142D for BG 56, SH 56.
The high speed screw (H) 4241 122 6702 and low
speed screw (L) 4241 122 6801 have been installed
since introduction and remain available as
replacements for this carburetor.
1.1.1 Overview
Part No. Installed in Designation of previous Designation
carburetor of new carburetor
4241 120 0601 BG 56, SH 56 C1M-S142A C1M-S142D
C1M-S142C
4241 120 0602 BG 66 C1M-S144 C1M-S144B
C1M-S144A
4241 120 0600 BG 86, SH 86 C1M-S141A C1M-S141D
C1M-S141C
TI_32_2009_30_01_01.fm Page 2 of 4
Technical Information 32.2009 Page 3
1.2 Starting after a long period of storage 3. Blower Housing
Problems with starting may be experienced if the Standardizing parts (SH 56)
machine is stored for several months at
temperatures below 41 °F (5 °C). The previous blower housing 4241 701 0700 is no
longer available for the SH 56.
In such a case, press the manual fuel pump several
times to prime the carburetor. Then wait several The blower housing 4241 700 4102 installed in the
minutes before attempting to start the engine. SH 86 is now used as a replacement part for the
SH 56.
Recommendation: Before storing the machine for
a prolonged period, always run the engine until the Blower housing 4241 700 4102 can also be used for
carburetor is dry. This helps prevent the carburetor older SH 56 machines.
diaphragms from sticking together – see also
chapter on "Storing the Machine" in the instruction
manual.
2. New Fanwheel
BG 56, BG 86, SH 56, SH 86
The previous fanwheel 4241 704 3400 will be
replaced by the new fanwheel 4241 704 3405. The
difference between the new fanwheel and previous
fanwheel is the material used.
The new fanwheel can also be used for older
machines.
The previous fanwheel is no longer available as a
replacement part.
TI_32_2009_30_01_01.fm
)m~ge 4 Technical Information 32.2009
Summary
Item Part Name Previous New Rem.
1 C1M-S142A, C1M-S142C carburetors; 4241 120 0601 --- 1)
including items 3 and 4:
2 C1M-S142D carburetor; --- 4241 120 0601 2)
including items 3 and 4:
3 High speed screw (H) 4241 122 6700 4241 122 6703 2)
4 Low speed screw (L) 4241 122 6801 4241 122 6803 2)
5 C1M-S144A carburetor; 4241 120 0602 --- 1)
6 C1M-S144B carburetor; --- 4241 120 0602 2)
7 C1M-S141A, C1M-S141C carburetors; 4241 120 0600 --- 1)
including items 9 and 10:
8 C1M-S141D carburetor; --- 4241 120 0600 2)
including items 9 and 10:
9 High speed screw (H) 4241 122 6700 4241 122 6702 2)
10 Low speed screw (L) 4241 122 6800 4140 122 6800 1), 2)
11 Fanwheel 4241 704 3400 4241 704 3405 1), 2)
12 Blower housing (SH 56) 4241 701 0700 4241 700 4102 2)
Remarks
1) Previous version of part no longer available from factory
2) New version of part can also be used for older machines
© ANDREAS STIHL AG & Co. KG, 2009 Technical Documentation
D1/MTK-ni
TI_32_2009_30_01_01.fm Page 3 of 4
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Extracted from the manufacturer's 2012 service catalogue. Most of these PDFs embed fonts with a shifted character map, so the text above was recovered rather than copied — read it as a faithful but imperfect transcription, and treat the page image above each block as the authority where the two disagree — the figures exist only there, because they are vector drawings that text extraction cannot keep.