Description
Overview:
This pump diaphragm is a genuine Stihl replacement part that restores reliable fuel delivery in small two‐stroke engines. Made from a fuel‐resistant elastomer for long service life, it flexes with crankcase pulses to move fuel through the carburettor, helping your machine start easily, idle cleanly and pick up smoothly under load. It is a direct-fit component for the carburettor used on many Stihl tools, including popular trimmers such as the FS 38 and FS 45. Supplied as Stihl MPN 1129 121 4800 (1129-121-4800), it is suitable for routine maintenance or to cure symptoms such as hard starting, poor acceleration or a primer bulb that does not fill. As a genuine part, it matches the original specification for fit and performance.
Key Features:
- Genuine Stihl part for assured compatibility and quality (MPN 1129 121 4800)
- Fuel‐resistant diaphragm material for durability and stable operation
- Maintains consistent fuel flow for smooth starting, idling and throttle response
- Direct replacement for worn or hardened diaphragms-no modifications required
- Helps prevent lean running and fuel starvation issues
- Suitable for a wide range of Stihl trimmers, brushcutters, blowers, chainsaws and cut‐off saws
- Cost‐effective fix that can reduce downtime and avoid larger repairs
- Straightforward to fit during a standard carburettor service
Typical Applications:
Used during carburettor servicing on Stihl handheld machines to restore proper fuel pumping. Ideal when engines are hard to start, surge at idle, hesitate on acceleration, or when the primer bulb fails to draw fuel. Suitable for regular preventative maintenance on frequently used tools in gardening, landscaping, construction, forestry, and grounds care.
Also known as:
Fuel pump diaphragm, carburettor diaphragm, carb diaphragm membrane, primer pump diaphragm, pulse pump diaphragm, carb fuel pump membrane, diaphragm repair part for Stihl carburettors.
Fits Models:
019 T, 019T, 020, 020 T, 020T, BG 45, BG 46, BG 50, BG 55, BG 65, BG 75, BG 85, BG45, BG46, BG50, BG55, BG65, BG75, BG85, BR 106, BR 350, BR 430, BR 45 C, BR 450, BR 450 C, BR106, BR350, BR430, BR450, BR450C, BR45C, BT 106, BT 120 C, BT 121, BT 121 Z, BT 45, BT106, BT120C, BT121, BT121Z, BT45, FC 55, FC 55 DZ, FC 73, FC 75, FC 85, FC55, FC55DZ, FC73, FC75, FC85, FH 75, FH75, FR 106, FR 108, FR 230, FR 230 T, FR 350, FR 410 C, FR 450, FR 460 TC, FR 480, FR 480 C, FR 85, FR 85 T, FR106, FR108, FR230, FR230T, FR350, FR410C, FR450, FR460TC, FR480, FR480C, FR85, FR85T, FS 106, FS 108, FS 120, FS 120 R, FS 200, FS 200 R, FS 230, FS 240, FS 250, FS 250 R, FS 260, FS 300, FS 350, FS 360 C, FS 38, FS 380, FS 400, FS 410 C, FS 45, FS 45 C, FS 45 L, FS 450, FS 46, FS 46 C, FS 480, FS 55, FS 55 C, FS 55 R, FS 55 RC, FS 55 T, FS 75, FS 80, FS 80 R, FS 85, FS 85 R, FS 85 RX, FS 85 T, FS106, FS108, FS120, FS120R, FS200, FS200R, FS230, FS240, FS250, FS250R, FS260, FS300, FS350, FS360C, FS38, FS380, FS400, FS410C, FS45, FS450, FS45C, FS45L, FS46, FS46C, FS480, FS55, FS55C, FS55R, FS55RC, FS55T, FS75, FS80, FS80R, FS85, FS85R, FS85RX, FS85T, HL 45, HL 75, HL 75 K, HL45, HL75, HL75K, HS 45, HS 52, HS 75, HS 80, HS 81, HS 82, HS 85, HS 86, HS 87, HS45, HS52, HS75, HS80, HS81, HS82, HS85, HS86, HS87, HT 70, HT 70 K, HT 75, HT70, HT70K, HT75, KA 120, KA 120 R, KA 250 Attachment, KA 85 R Attachment, KA120, KA120R, KA250 Attachment, KA250Attachment, KA85R Attachment, KA85RAttachment, KM 55, KM 55 C, KM 55 R, KM 55 RC, KM 85, KM 85 R, KM55, KM55C, KM55R, KM55RC, KM85, KM85R, KR 85 Attachment, KR85 Attachment, KR85Attachment, KW 85, KW85, MM 55, MM 55 C MultiSystem, MM 55-Z MultiSystem, MM55, MM55-ZMultiSystem, MM55CMultiSystem, MS 150 C, MS 150 T C, MS 151 C, MS 151 TC, MS 170, MS 170 C, MS 171, MS 171 C, MS 180, MS 180 C, MS 181, MS 181 C, MS 190 T, MS 191 T, MS 192 C, MS 192 T, MS 192 TC, MS 193 C, MS 193 T, MS 193 TC, MS 194 T, MS 194 TC, MS 200, MS 200 T, MS 201, MS 201 C, MS 201 T, MS 201 TC, MS 210, MS 210 C, MS 211, MS 211 C, MS 230, MS 230 C, MS 231, MS 241 C, MS 250, MS 250 C, MS 251, MS 261, MS 261 C, MS 271, MS 271 C, MS 291, MS 291 C, MS 362, MS 362 C, MS 400 C, MS150C, MS150T C, MS150TC, MS151C, MS151TC, MS170, MS170C, MS171, MS171C, MS180, MS180C, MS181, MS181C, MS190T, MS191T, MS192C, MS192T, MS192TC, MS193C, MS193T, MS193TC, MS194T, MS194T / MS194TC, MS194TC, MS200, MS200T, MS201, MS201C, MS201T, MS201TC, MS210, MS210C, MS211, MS211C, MS230, MS230C, MS231, MS241C, MS250, MS250C, MS251, MS261, MS261C, MS271, MS271C, MS291, MS291C, MS362, MS362C, MS400C, SH 55, SH 85, SH55, SH85, SP 400, SP 450, SP 451, SP 481, SP 80, SP 80 K, SP 81, SP 85, SP 85 K, SP400, SP450, SP451, SP481, SP80, SP80K, SP81, SP85, SP85K, SR 430, SR 430-Z, SR 440, SR 450, SR 450-Z, SR430, SR430-Z, SR430Z, SR440, SR450, SR450-Z, SR450Z, TS 410, TS 420, TS 440, TS410, TS420, TS440
Alternate Part Numbers:
1129-121-4800, 11291214800
Product Specifications
| L&S Part No. | 1129 121 4800 |
|---|---|
| Part Type | Genuine Part |
| Manufacturer | Stihl |
| OEM No. | 11291214800 |
| Unit of Sale | 1 |
| Applications | 019 T, 019T, 020, 020 T, 020T, BG 45, BG 46, BG 50, BG 55, BG 65, BG 75, BG 85, BG45, BG46, BG50, BG55, BG65, BG75, BG85, BR 106, BR 350, BR 430, BR 45 C, BR 450, BR 450 C, BR106, BR350, BR430, BR450, BR450C, BR45C, BT 106, BT 120 C, BT 121, BT 121 Z, BT 45, BT106, BT120C, BT121, BT121Z, BT45, FC 55, FC 55 DZ, FC 73, FC 75, FC 85, FC55, FC55DZ, FC73, FC75, FC85, FH 75, FH75, FR 106, FR 108, FR 230, FR 230 T, FR 350, FR 410 C, FR 450, FR 460 TC, FR 480, FR 480 C, FR 85, FR 85 T, FR106, FR108, FR230, FR230T, FR350, FR410C, FR450, FR460TC, FR480, FR480C, FR85, FR85T, FS 106, FS 108, FS 120, FS 120 R, FS 200, FS 200 R, FS 230, FS 240, FS 250, FS 250 R, FS 260, FS 300, FS 350, FS 360 C, FS 38, FS 380, FS 400, FS 410 C, FS 45, FS 45 C, FS 45 L, FS 450, FS 46, FS 46 C, FS 480, FS 55, FS 55 C, FS 55 R, FS 55 RC, FS 55 T, FS 75, FS 80, FS 80 R, FS 85, FS 85 R, FS 85 RX, FS 85 T, FS106, FS108, FS120, FS120R, FS200, FS200R, FS230, FS240, FS250, FS250R, FS260, FS300, FS350, FS360C, FS38, FS380, FS400, FS410C, FS45, FS450, FS45C, FS45L, FS46, FS46C, FS480, FS55, FS55C, FS55R, FS55RC, FS55T, FS75, FS80, FS80R, FS85, FS85R, FS85RX, FS85T, HL 45, HL 75, HL 75 K, HL45, HL75, HL75K, HS 45, HS 52, HS 75, HS 80, HS 81, HS 82, HS 85, HS 86, HS 87, HS45, HS52, HS75, HS80, HS81, HS82, HS85, HS86, HS87, HT 70, HT 70 K, HT 75, HT70, HT70K, HT75, KA 120, KA 120 R, KA 250 Attachment, KA 85 R Attachment, KA120, KA120R, KA250 Attachment, KA250Attachment, KA85R Attachment, KA85RAttachment, KM 55, KM 55 C, KM 55 R, KM 55 RC, KM 85, KM 85 R, KM55, KM55C, KM55R, KM55RC, KM85, KM85R, KR 85 Attachment, KR85 Attachment, KR85Attachment, KW 85, KW85, MM 55, MM 55 C MultiSystem, MM 55-Z MultiSystem, MM55, MM55-ZMultiSystem, MM55CMultiSystem, MS 150 C, MS 150 T C, MS 151 C, MS 151 TC, MS 170, MS 170 C, MS 171, MS 171 C, MS 180, MS 180 C, MS 181, MS 181 C, MS 190 T, MS 191 T, MS 192 C, MS 192 T, MS 192 TC, MS 193 C, MS 193 T, MS 193 TC, MS 194 T, MS 194 TC, MS 200, MS 200 T, MS 201, MS 201 C, MS 201 T, MS 201 TC, MS 210, MS 210 C, MS 211, MS 211 C, MS 230, MS 230 C, MS 231, MS 241 C, MS 250, MS 250 C, MS 251, MS 261, MS 261 C, MS 271, MS 271 C, MS 291, MS 291 C, MS 362, MS 362 C, MS 400 C, MS150C, MS150T C, MS150TC, MS151C, MS151TC, MS170, MS170C, MS171, MS171C, MS180, MS180C, MS181, MS181C, MS190T, MS191T, MS192C, MS192T, MS192TC, MS193C, MS193T, MS193TC, MS194T, MS194T / MS194TC, MS194TC, MS200, MS200T, MS201, MS201C, MS201T, MS201TC, MS210, MS210C, MS211, MS211C, MS230, MS230C, MS231, MS241C, MS250, MS250C, MS251, MS261, MS261C, MS271, MS271C, MS291, MS291C, MS362, MS362C, MS400C, SH 55, SH 85, SH55, SH85, SP 400, SP 450, SP 451, SP 481, SP 80, SP 80 K, SP 81, SP 85, SP 85 K, SP400, SP450, SP451, SP481, SP80, SP80K, SP81, SP85, SP85K, SR 430, SR 430-Z, SR 440, SR 450, SR 450-Z, SR430, SR430-Z, SR430Z, SR440, SR450, SR450-Z, SR450Z, TS 410, TS 420, TS 440, TS410, TS420, TS440 |
| Machine Type | Brushcutters, Chainsaws, Hedge Trimmers, Blower/Shredders, Mist Blowers, Tillers, Pole Pruners, Disc Cutters, Edging Trowel |
| Fits Brands | Stihl |
| Fits Models | TS410, TS420 | MS170, MS170C | MS180, MS180C | MS230, MS230C | MS250, MS250C | MS200, MS200T | MS192C, MS192T, MS192TC | MS171, MS171C | MS181, MS181C | MS211, MS211C | MS201, MS201C, MS201T, MS201TC | MS362, MS362C | FS38, FS45, FS46 | FS55, FS55C, FS55R | FS75, FS80, FS85 | FS120, FS200, FS250 | FS240, FS260 | FS300, FS350, FS380 | FS360C FS410C | FS400, FS450, FS480 | BR350, BR430, BR450 | MS261, MS261C | MS150T C | TS440 | HS45 | HS75 | HS81, HS86 | HS82 | BG75 | BR45C | BR106 | SH55, SH85 | BG50 | FS106 | FS108 | FR85T, FR85 | FR106 | FR230, FR230T | FR350, FR450, FR480, FR480C | FR410C, FR460TC | FR108 | 019T | 020, 020T | MS231, MS251 | MS241C | MS271, MS271C, MS291, MS291C | MS150C | HT70, HT70K, HT75 | FS230 | MS190T | MS191T | MS193C, MS193T, MS193TC | KM55, KM55C, KM55R, KM55RC | KM85, KM85R | KA85R Attachment | KR85 Attachment | KA120, KA120R, KA250 Attachment | MM 55, MM 55 C MultiSystem | MM 55-Z MultiSystem | KW 85 | FC 55 DZ | FC 73 | FC 75 | FC 85 | SR 430, SR 450 | SR 430-Z | SR 440 | SR 450-Z | BT 120 C | BT 121 | BT 121 Z | BT 45 | HL45 | HL75, HL75K | HS52 | MS151C, MS151TC | MS194T / MS194TC | MS400C | BG55 | BG85 | BR430 | BR450, BR450C | HS80 | HS85 | HS87 | FS361C | FS411 C-EM | FS461 C-EM | SP 85 | SP 481 | MC 200 | FS461 C-EML |
