Technical Information · issue 15 of 2009
Carburetor; Fuel Containing Ethanol (E10 Blend); Hose Barb Connectors / Flange / Metering Diaphragm / Pump Piston Kit / Carburetor Parts Kit; Summary; Ignition Module; Models FC 55, FS 38, 45, 46, 55, HL 45, KM 55; Model HS 45; Models BG 45, 55, 6
Model Carburetor Carburetor Remarks
IssueTI 15/2009
Full text
Page 1 of 8
STIH)
Technical Information 15.2009
STIHL BG 45, 46, 55, 65, 85 Blowers – Series 4229
STIHL BT 45 Power Drill – Series 4314
STIHL HS 45 Hedge Trimmer – Series 4228
STIHL HL 45 Hedge Trimmer – Series 4232
STIHL FC 55 Power Edger – Series 4140
STIHL KM 55 KombiEngine – Series 4140
STIHL FS 45, 46, 55 Brushcutters – Series 4140
STIHL MM 55 MultiEngine – Series 4601
STIHL BR 45 Backpack Blower – Series 4229
STIHL SH 55, 85 Shredder Vacuums – Series 4229
Contents
1. Carburetor
1.1 Changes to design
1.2 Hose Barb Connectors / Flange / Metering Diaphragm / Pump Piston Kit / Carburetor Parts Kit
1.3 Summary
2. Ignition module
2.1 Models FC 55, FS 45, 46, 55, HL 45, KM 55
2.2 Model HS 45
2.3 Models BG 45, 55, 65, 85, BR 45,
SH 55, 85
2.4 All Other Models
2.5 Assignment of Production / Replacement Ignition Modules
2.6 Introduction of Modification
2.7 Summary
1. Carburetor
The new and modified carburetors can be identified
1.1 Changes to design
either by the index letter in the designation or a new
Changes to optimize carburetor function have been designation.
implemented into the manufacturing process.
TI_15_2009_30_01_01.fm englisch / English
)m~ge 2 Technical Information 15.2009
Running the power tools on fuel with an ethanol
content of more than 10% is not recommended
because starting, and running behavior, and
performance deteriorate as the ethanol content
increases.
1.1.1 Models FC 55, FS 45, FS 46, FS 55,
HL 45, KM 55
234TI012 KN
The designation of carburetor 4140 120 0612 has
been changed from C1Q-S97 to C1Q-S97A to
denote improvements.
Type and position of designation on carburetor
The changes have been made to improve the
running characteristics and performance of the
power tools.
The changes have no influence on the function or 1.1.2 All Other Models
adjustment of the previous or modified new The engineering changes have already been
carburetors. announced for some models in other technical
information bulletins. The table below lists all
improved carburetors installed on power tools
equipped with the series 4140 powerhead.
Model Carburetor Carburetor Remarks
Part No. Designation
BG 45, BG 46 4229 120 0607 C1Q-S112A see TI 20.2008
BG 55, BG 65, BG 85 4229 120 0606 C1Q-S68D see TI 20.2008
BR 45 4229 120 0607 C1Q-S112A see TI 20.2008
BT 45 4314 120 0601 C1Q-S74D see TI 18.2008
FC 55 4140 120 0612 C1Q-S97A see 1.1.1 in this TI
4140 120 0616 C1Q-S153 see 1.2.1 in this TI
FS 45, FS 46, FS 55 4140 120 0612 C1Q-S97A see 1.1.1 in this TI
4140 120 0616 C1Q-S153 see 1.2.1 in this TI
HL 45 4140 120 0612 C1Q-S97A see 1.1.1 in this TI
4140 120 0616 C1Q-S153 see 1.2.1 in this TI
HS 45 4228 120 0608 C1Q-S169 see 1.2.2 in this TI
KM 55 4140 120 0612 C1Q-S97A see 1.1.1 in this TI
4140 120 0616 C1Q-S153 see 1.2.1 in this TI
MM 55 4140 120 0609 C1Q-S93 updates already
implemented
SH 55, SH 85 4229 120 0606 C1Q-S68D see TI 20.2008
TI_15_2009_30_01_01.fm Page 2 of 8
Technical Information 15.2009 Page 3
1.2 Hose Barb Connectors / Flange / – The previous versions of the pump piston (1),
Metering Diaphragm / Pump Piston Kit / sealing ring (2) and spring (3) in the accelerator
Carburetor Parts Kit pump have been replaced with new versions to
improve the efficiency of the seal and
1.2.1 Models FC 55, FS 45, FS 46, FS 55, functionality. The new sealing ring is made of
HL 45, KM 55 NBR (neoprene). For reasons of
interchangeability the new versions of the parts
will be supplied only as a "pump piston kit"
4 8 1123 120 9700.
– Carburetor parts kit 4228 007 1051 must be
used for the new carburetor in place of the
previous parts kit 4140 007 1060. Unlike the
3 7 previous kit, the new carburetor parts kit
contains the new metering diaphragm
2 4314 121 4700, but not the flange.
6
234TI009 KN
1 5
Interchangeability
The new carburetors may be installed in previous
Left: Previous C1Q-S97A carburetor with
versions of the power tools.
straight connectors
Right: New C1Q-S153 carburetor with hose The new flange 4314 120 2200 can be used in the
barb connectors previous versions of carburetors C1Q-S97, -S97A
and -S71.
The previous carburetor 4140 120 0612 (1) with
straight connectors (2, 3) on the flange (4) and The new metering diaphragm 4314 121 4700 can
carburetor body has been replaced with the new also be used in the previous versions of carburetors
version 4140 120 0616 (5) with hose barb C1Q-S97, -S97A and -S71.
connectors (6, 7) on the flange (8) and carburetor The new pump piston kit 1123 120 9700 may also
body. be used for repairs to the previous carburetors
The following parts and assemblies of the C1Q-S97 and -S97A.
carburetors have been changed in connection with The new carburetor parts kit can be used in the
this modification. previous versions of carburetors C1Q-S97, -97A
– The previous flange (4) 4228 120 2200 with and -S71.
straight connector (3) has been replaced with
the new version (8) 4314 120 2200 with hose
Setting data
barb connector (7).
No changes have been made to the values for the
– The previous metering diaphragm
basic setting of the carburetor in the service shop.
4229 121 4700 has been replaced with the new
version 4314 121 4700. The only difference
between the two metering diaphragms is the Introduction of modification
type of material used.
Previous or new versions of the carburetors are
being installed on the production line – depending
2 on the specific model and factory.
3
234TI010 KN
TI_15_2009_30_01_01.fm
)m~ge 4 Technical Information 15.2009
1.2.2 Model HS 45 1.2.3 Other Models
The changes with regard to hose barb connectors,
flange, metering diaphragm, pump piston kit and
carburetor parts kit were made some time ago and
were announced in the following technical
information bulletins:
Model TI
1 1
BG 45, 46, 55, 65, 85 20.2008
2 BR 45 20.2008
2
BT 45 18.2008
234TI011 KN
SH 55, 85 20.2008
Left: Previous C1Q-S70A carburetor with
one straight connector
Right: New C1Q-S169 carburetor with two
1.2.4 Service note for hose barb connectors
hose barb connectors
To guarantee no leaks of the fuel system:
The introduction of the hose barb connector (1) on
the carburetor (for the return hose) was described in . To avoid damaging hose barb connectors,
TI 30.2008. remove and install fuel hoses in line with the
connector by hand where possible – do not use
The hose barb connector (2) on the carburetor (for
sharp-edged pliers, screwdrivers, etc. and do
the suction hose) was introduced in the course of a
not cut open fuel hoses with a knife or similar
second modification. In this modification the
tools.
previous version of the C1Q-S70A carburetor
(4228 120 0606) was replaced with the new C1Q- . Do not re-use fuel hoses after removal. Always
S169 carburetor (4228 120 0608). replace with new hoses – fuel hoses may be
over-stretched during removal.
The previous changes to the flange, metering
diaphragm, pump piston kit and carburetor parts kit, . Fit new fuel hoses dry or with the aid of OH 723
are described in TI 30.2008. press fluid – 0781 957 9000. Other press fluids
are not approved and may result in damage to
the fuel hoses.
Interchangeability
. Coat the ends of the hose and the connectors
The new carburetor may be installed in previous with OH 723 press fluid prior to installing the
versions of the power tools. new hoses onto the hose barb connectors.
Setting data
No changes have been made to the values for the
basic setting of the carburetor in the service shop.
Introduction of modification
Installation of the new carburetor on the production
line will commence in the foreseeable future.
TI_15_2009_30_01_01.fm Page 3 of 8
Technical Information 15.2009 Page 5
Note on OH 723 press fluid
OH 723 press fluid produces a lubricating film which
simplifies assembly. The lubricant evaporates after
a short period – allowing for a tight fit.
Never use fuel, oil or grease as a lubricant for this
purpose. Fuel, oil and grease does not evaporate –
allowing the hose to possibly loosen or become
detached.
1.3 Summary
Item Part Name Previous New Rem.
FC 55, FS 45, FS 46, FS 55, HL 45, KM 55
1 C1Q-S97A carburetor; 4140 120 0612 --- 1) 2)
including items 6 to 10
2 C1Q-S153 carburetor; --- 4140 120 0616 3) 2)
including items 3, 6 and 7:
3 Pump piston kit; --- 1123 120 9700 3)
including items 8 to 10:
4 Carburetor parts kit; 4140 007 1060 --- 4) 2)
including items 6 and 7:
5 Carburetor parts kit; --- 4228 007 1051 3)
including item 7:
6 Flange 4228 120 2200 4314 120 2200 4)
7 Metering diaphragm 4229 121 4700 4314 121 4700 4)
8 Pump piston 4140 121 5800 -*- 4) 5)
9 Sealing ring 1132 122 3600 -*- 4) 5)
10 Spring 4180 122 3002 -*- 4) 5)
all other parts as before
HS 45
11 C1Q-S70A carburetor 4228 120 0606 --- 1) 2)
12 C1Q-S169 carburetor --- 4228 120 0608 3) 2)
all other parts as before
Modification to be introduced : in progress (see 1.2.1 and 1.2.2 "Introduction of modification")
Remarks
1) Previous version of part will be supplied from factory only as long as existing stocks last
2) see “Service Notes”
3) New version of part can also be used for older machines
4) Previous version of part remains available for older models
5) New version of part is not available as separate item
TI_15_2009_30_01_01.fm
)m~ge 6 Technical Information 15.2009
2. Ignition module Interchangeability
New ignition modules will be installed in the majority The new ignition modules are fully interchangeable
of the power tool models and versions listed below. with the previous versions in machines without a
catalytic converter.
The new ignition modules are microprocessor-
controlled and allow precise adjustment of ignition Under no circumstances may the new ignition
timing in the cut-off range and minimize the modules 4140 400 1307 and 4140 400 1308 be
permitted deviation of the cut-off speed. used in machines with a catalytic converter. The
catalytic converter would otherwise be
permanently damaged within a very short
period.
2.1 Models FC 55, FS 45, 46, 55, HL 45,
KM 55
2.1.1 Models with catalytic converter 2.2 Model HS 45
Ignition module 4140 400 1305 is used in The description under 2.1.2 applies to model HS 45,
production and as a replacement part for models but the previous ignition module 4140 400 1305 will
with a catalytic converter. This ignition module was be replaced directly with version 4140 400 1308
designed for machines with a catalytic converter without any interim phase.
and already has one of the characteristics described
above: Adjustment of ignition timing in the cut-off 2.2.1 Note on replacement parts
range. Ignition module 4140 400 1307 is listed in the
Ignition module 4140 400 1305 will continue to be current issue of the parts documentation. Ignition
used in production and as a replacement part for module 4140 400 1308 should be used – not
models with a catalytic converter. version 4140 400 1307.
2.2.2 Service note
Interchangeability The factory also installed ignition module
Ignition module 4140 400 1305 may continue to be 4140 400 1307 in some machines for a temporary
used in models without a catalytic converter. period. If the ignition system is found to be the
source of a fault during a repair, the ignition module
4140 400 1307 should be replaced with the new
version 4140 400 1308.
2.1.2 Models without catalytic converter
If ignition module 4140 400 1308 is not available,
The use of ignition module 4140 400 1305 as a
ignition module 4140 400 1305 for catalytic
standardized replacement was announced in TI
converter machines may also be used.
25.2004. The factory, however, continued to install
ignition module 4140 400 1303 in new machines.
The standardization of replacements has now been
2.3 Models BG 45, 55, 65, 85, BR 45,
discontinued. The previous ignition module
SH 55, 85
4140 400 1305 was replaced with ignition module
4140 400 1307 in an initial phase and it, in turn, will The previous ignition module 4229 400 1300 will be
be replaced with ignition module 4140 400 1308 in replaced with the modified version. The part number
a second phase. remains unchanged. The only change is the index
letter of the part number on the ignition module
(see 2.5).
2.4 All Other Models
The ignition modules of the models not listed in
chapters 2.1 to 2.3 have not been modified
(see also 2.5).
TI_15_2009_30_01_01.fm Page 4 of 8
Technical Information 15.2009 Page 7
2.5 Assignment of Production / Replacement
Ignition Modules
The table below shows the assignment of ignition
modules used on the production line and the
versions supplied as replacements. STIHL 4XXX 13XXX
234TI013 KN
Type and position of designation on carburetor
Model Catalytic Designation Part No.
converter Production ignition module Replacement ignition module
Previous New Previous New
BG 45, BG 46
BG 55, BG 65,
BG 85,
BR 45 yes/no 4229 1300A 1) 4229 1300B 1) 4229 400 1300
BT 45 no 4314 1300A 4314 400 1300
FC 55,
FS 45, FS 46,
FS 55,
HL 45,
KM 55 yes 4140 1305A 4140 400 1305
2) 3)
no 4140 1303A 4140 1307A 4140 400 1305 4140 400 1307 3)
4140 1306A 2) 4140 1308A 4140 400 1308
HS 45 no 4140 1303A 2)
4140 1306A 2) 4140 1308A 4140 400 1305 4140 400 1308
4) 4)
MM 55 no 4140 1304A 4140 1304B 4140 400 1304
SH 55, SH 85 yes/no 4229 1300A 1) 4229 1300B 1) 4229 400 1300
1) Only the index letter was changed when the supplier was changed.
2) Parts have the same function. Part numbers may differ depending on manufacturing plant.
3) Version 4140 400 1307 is only a temporary solution and will be replaced with ignition module
4140 400 1308.
4) Change for technical reasons only.
TI_15_2009_30_01_01.fm
)m~ge 8 Technical Information 15.2009
2.6 Introduction of Modification
Previous or new versions of the ignition modules are
being installed on the production line – depending
on the specific model and factory.
2.7 Summary
Item Part Name Previous New Rem.
FC 55, FS 45, 46, 55, HL 45, KM 55
with catalytic converter
1 Ignition module 4140 400 1305 4140 400 1305 1)
FC 55, FS 45, 46, 55, HL 45, KM 55
without catalytic converter
2 Ignition module 4140 400 1305 4140 400 1307 2) 3)
4140 400 1308 4) 5) 7)
HS 45
3 Ignition module 4140 400 1305 4140 400 1308 2) 5) 7)
BG 45, 46, 55, 65, 85, BR 45, SH 55, 85
4 Ignition module 4229 400 1300 4229 400 1300 6)
Modification to be introduced in progress (see 2.6 "Introduction of Modification")
Remarks
1) No engineering change
2) Previous version of part remains available for models FC 55, FS 45, 46, 55, HL 45 and KM 55
with catalytic converter
3) New version of part is only an interim solution and will be replaced in the foreseeable future
with version 4140 400 1308
4) New version of part will replace 4140 400 1307 in the foreseeable future
5) New version of part will be available from factory in the foreseeable future
6) Unmodified version of part will be supplied from factory until existing stocks are exhausted
7) New version of part can also be used for older machines with ignition module 4140 400 1303
(see TI 25.2004)
© ANDREAS STIHL AG & Co. KG, 2009 Technical Documentation
D1/MTK-na
TI_15_2009_30_01_01.fm Page 5 of 8
Page 6 of 8
Page 7 of 8
Page 8 of 8
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.