Technical Information · issue 8 of 1998
021, 023, 025: Carburetors
Model 021, 023, 025 Chainsaws - Series 1123
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Technical Information
08.98
Model 021, 023, 025 Chainsaws - Series 1123
Carburetors
Fixed jets with smaller orifices will be installed in Service notes
the carburetors to allow for the fleece air filter (see
TI 38.96). 021
The carburetor designations change as follows: Fixed jet 1123 121 5640 (Ø 0.53 mm) may be
installed in WT 283 A and WT 503 carburetors in
case of a repair.
Original New fo
023, 025
021 WT 283 A WT 503
Fixed jet 0.57 Fixed jet 0.53 Fixed jet 1123 121 5625 (Ø 0.55 mm) may be
installed in WT 313, WT 283 A and WT 283 B
023, 025 WT 283 A WT 283 B
carburetors in case of a repair.
Fixed jet 0.57 Fixed jet 0.55
The WT 313 was predecessor to the WT 283 A in
023 C WT 498 WT 498 A model 025 (see TI 13.97).
Fixed jet 0.57 Fixed jet 0.55
023 C
With the exception of the fixed jets, the parts of the
WT 283 A, WT 503 and WT 283 B are identical.
Fixed jet 1123 121 5625 (Ø 0.55 mm) may be
installed in WT 286, WT 498 and WT 498 A
The 0.57mm fixed jet 1123 121 5610 installed in
carburetors in case of a repair (see TI 28.97)
the WT 283 A and WT 498 has been deleted
without replacement.
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Summary
Item Part Name Original New Rem.
version version
021, 023, 025:
1 Carburetor WT 283 A 1123 120 0610 --- 1)
including item 4
021
2 Carburetor WT 503 --- 1123 120 0614
including item 5
023, 025
3 Carburetor WT 283 B --- 1123 120 0610
including item 6
4 Fixed jet 0.57 1123 121 5610 --- 1)
5 Fixed jet 0.53 --- 1123 121 5640
6 Fixed jet 0.55 --- 1123 121 5625
023 C
7 Carburetor WT 498
including item 4
1123 120 0616 fo --- 2)
8 Carburetor WT 498 A --- 1123 120 0616
including item 6
Modification to be introduced from machine number X 37 731 266
Remarks
1) Original version of part no longer available from factory
2) Only modified version of part is available from factory
Last Technical Information on series 021, 023, 025: 28.97
1998 Andreas Stihl Andreas Stihl - D1/MTK-st
Technical Documentation 6213 Page 2 of 2
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