Technical Information · issue 32 of 1996
Carburetor
Model 034, 036 Chainsaws - Series 1125
Full text
Page 1 of 1
Technical Information
32.96
Model 034, 036 Chainsaws - Series 1125
Carburetor =sealing ring on high speed and low
speed screws, valve jet, part-load fixed jet
A modified version of carburetor 1125 120 0651 When working in the part-load range (e.g. limbing)
will be installed from machine number the throttle shutter is often in a position between
X 35 047 484K=fts type designation changes idle and full throttle. The fuel-air mixture can
from C3A-S26 to C3A-S31A. become over-lean in such situations (“part load flat
spot”). In future, a part-load fixed jet will be installed
The high speed and low speed screws in the new in the new version of the carburetor to help prevent
carburetors will be equipped with a sealing ring to this.
ensure an airtight seal. Valve jet 1125 121 5404
will be installed instead of valve jet 1125 121 5402.
The part-load fixed jet cannot be removed.
It can be blown clear with compressed air.
6XPPDU\
Item Part Name Original New Rem.
version version
1 Carburetor C3A-S26; 1125 120 0651 --- 1)
2 Carburetor C3A-S31A; --- 1125 120 0651 2)
each of above includes items 3 - 5:
3 Valve jet 1125 121 5402 1125 121 5404 3)
4 High speed screw 1125 122 6701 1125 122 6702 3)
5 Low speed screw 1125 122 6801 1125 122 6802 3)
All other parts as before
Modification to be introduced from machine number X 35 047 484
5HPDUNV
1) Only modified version of part is available from factory
2) Use C3A-S19 carburetor 1125 120 0606 for 034
3) Original version of part remains available for C3A-S26 carburetor
Service notes
Original high speed/low speed screws and original valve jets must not be installed in the new version of the
carburetor because they are calibrated differently. This would result in faulty adjustments and engine running
problems.
These changes also apply to the carburetor 1125 120 0609 for VH machines introduced TI 21.96.
Last Technical Information on models 034, 036: 21.96
Andreas Stihl - D1/MTK-al
1996 Andreas Stihl Technical Documentation 5872 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.