Technical Information · issue 45 of 2009
New C1Q-S157 Carburetor; Fuel Containing Ethanol (E10 Blend); Pump Piston Kit; End Cover / Idle Speed Screw; Interchangeability; Setting Data / Service Notes; Introduction of Modification; Summary
IssueTI 45/2009
Full text
Page 1 of 3
STIH)
Technical Information 45.2009
STIHL FH 75 Power Scythe – Series 4230
STIHL HL 75 Hedge Trimmer – Series 4230
STIHL HT 70, 75 Pole Pruners – Series 4138
STIHL FC 75, 85 Power Edger – Series 4137
STIHL KW 85 PowerSweep – Series 4602
STIHL KM 85 KombiEngine – Series 4137
STIHL FS 75, 80, 85 Brushcutters – Series 4137
Contents
1. New C1Q-S157 Carburetor
1.1 Pump Piston Kit
1.2 End Cover / Idle Speed Screw
1.3 Interchangeability
1.4 Setting Data / Service Notes
1.5 Introduction of Modification
1.6 Summary
1. New C1Q-S157 Carburetor
For notes on power tools that are no longer in
production see chapter "1.3 Interchangeability".
The new carburetor can be distinguished from the
previous carburetor by its new designation.
392TI064 KN
Type and position of designation on carburetor
TI_45_2009_30_01_01.fm englisch / English
)m~ge 2 Technical Information 45.2009
The changes have been made so that the running 1.3 Interchangeability
characteristics and performance of the power tools
are identical when running on fuel with or without 1.3.1 Complete carburetor
enthanol. The new, complete carburetor is fully
The changes have no influence on the function of interchangeable with the following previous
the previous or new carburetors. versions of the carburetors:
– C1Q-S69A
– C1Q-S63 and C1Q-S63A
1.1 Pump Piston Kit
– C1Q-S56 (see also TI 16.2001).
On the C1Q-S56 carburetor it may be necessary to
2 install the previous pin 4137 121 8900 to attach the
throttle cable.
1 1.3.2 Pump piston kit
The new pump piston kit 4137 120 9700 may also
3 be used for repairs to the previous carburetors C1Q-
S63 and C1Q-S63A.
234TI010 KN
1.3.3 End cover / Idle speed screw
Always use the new idle speed screw together with
The previous versions of the pump piston (1), the new end cover. Use the previous version of the
sealing ring (2) and spring (3) in the accelerator idle speed screw only in the previous version of the
pump have been replaced with new versions to end cover.
improve the efficiency of the seal and function. The
new sealing ring is made of NBR (neoprene). For
reasons of interchangeability the new versions of 1.4 Setting Data / Service Notes
the parts will be supplied only as a "pump piston kit"
4137 120 9700. New setting data apply after installing a new
carburetor in previous versions of power tools.
New setting data apply after installing a new
1.2 End Cover / Idle Speed Screw carburetor in previous versions of power tools.
1.4.1 Setting data without limiter caps
(service shop)
1
H L
2
392TI065 KN
LA
392TI067 KN
The previous versions of the end cover (1) and idle
speed screw (2) have been replaced by new
versions.
Low speed screw L: Open 1.5 (24/16) turns
The new idle speed screw is about 1.2 mm longer
High speed screw H: Open 2 (32/16) turns
than the previous version in order to extend its
adjustment range. Idle speed screw LA: 2800 +/- 200 rpm
TI_45_2009_30_01_01.fm Page 2 of 3
Technical Information 45.2009 Page 3
1.5 Introduction of Modification
New carburetors are already being installed on the
production line.
1.6 Summary
Item Part Name Previous New Rem.
1 C1Q-S69A carburetor; 4137 120 0608 --- 1) 2)
including items 4 to 8:
2 C1Q-S157 carburetor; --- 4137 120 0614 2) 3)
including items 3, 7 and 8:
3 Pump piston kit; --- 4137 120 9700 3)
including items 4 to 6:
4 Pump piston 4229 121 5800 -*- 4) 5)
5 Sealing ring 4140 122 3600 -*- 4) 5)
6 Spring 4229 122 3001 -*- 4) 5)
7 End cover 1123 121 0800 4134 121 0802 4)
8 Idle speed screw 4180 122 6200 4140 122 6200 4)
Modification to be introduced see 1.6.
Remarks
1) Previous version of part no longer available from factory
2) See "Parts List" for individual components
3) New version of part can also be used for older machines
4) Previous version of part remains available for older machines and other models
5) New version of part is not available as separate item
© ANDREAS STIHL AG & Co. KG, 2009 Technical Documentation
D1/MTK-na
TI_45_2009_30_01_01.fm Page 3 of 3
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.