Description
Overview:
The Metering Diaphragm for Stihl carburettors is a genuine Stihl spare (part no. 4180 121 4700) that controls fuel delivery to keep engines running smoothly. Made from a durable, fuel‐resistant elastomer composite, it flexes precisely to maintain the correct fuel level in the metering chamber, supporting clean starting, stable idle and consistent power. It is designed for a wide range of Stihl handheld tools used in landscaping and forestry, including brushcutters, blowers, hedge trimmers, multi‐tools and chainsaws. Ideal for restoring performance on machines such as the FS75 and FS80, this diaphragm replaces aged or hardened originals that can cause hard starting, lean running or flooding. As a Genuine Part, fit and function match the original factory specification.
Key Features:
- Genuine Stihl OEM component for correct fit, function and reliability
- Precisely regulates carburettor fuel level for smooth starting, idle and acceleration
- Durable, fuel‐resistant construction suited to regular pump petrol in UK conditions
- Helps cure symptoms of hard starting, hesitation, surging or stalling due to a worn diaphragm
- Straightforward to install during routine carburettor maintenance or rebuilds
- Stable metering action supports efficient running and helps minimise premature engine wear
- Suitable for workshop servicing or on‐site repairs across mixed tool fleets
- Direct replacement for Stihl 4180 121 4700 with approved alternates listed below
Typical Applications:
Used during carburettor services on Stihl handheld machines to restore proper fuel metering after long storage, ethanol exposure, or normal wear. Common when addressing poor idle, inconsistent throttle response, hard starting, fuel leaks or flooding, and as part of a full carburettor kit refresh alongside gaskets, needle and lever.
Also known as:
Metering membrane, carburettor diaphragm, fuel diaphragm, carb membrane, carb metering diaphragm, fuel metering membrane, carb diaphragm sheet.
Fits Models:
BG 45, BG 46, BG 55, BG 65, BG 85, BG45, BG46, BG50, BG55, BG65, BG85, BR 45 C, BR350, BR430, BR450, BR45C, BR500, FC 55, FC 55 DZ, FC 73, FC 75, FC 85, FC55, FC55DZ, FC73, FC75, FC85, FH 75, FH75, FR 85, FR 85 T, FR85, FR85T, FS 120, FS 200, FS 250, FS 300, FS 350, FS 38, FS 380, FS 45, FS 45 C, FS 45 L, FS 46, FS 46 C, 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, FS120, FS200, FS250, FS300, FS350, FS38, FS380, FS45, FS45C, FS45L, FS46, FS46C, 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 81, HS 81 R, HS 81 RC, HS 81 T, HS 81 TC, HS 82, HS 86, HS 86 R, HS 86 T, HS45, HS81, HS81R, HS81RC, HS81T, HS81TC, HS82, HS86, HS86R, HS86T, HT 70, HT 70 K, HT 75, HT70, HT70K, HT75, KA 120, KA 120 R, KA 250, KA 85 R, KA120, KA120R, KA250, KA250 Attachment, KA85R, KA85R Attachment, KM 55, KM 55 C, KM 55 R, KM 55 RC, KM 85, KM 85 R, KM55, KM55C, KM55R, KM55RC, KM85, KM85R, KR 85, KR85, KR85 Attachment, KW 85, KW85, MM 55, MM 55 C, MM 55 C MultiSystem, MM 55-Z MultiSystem, MM55, MM55C, MS 171, MS 181, MS 181 C, MS 211, MS 211 C, MS171, MS171C, MS181, MS181C, MS211, MS211C, MS241C, SH 55, SH 85, SH55, SH85, SP 81, SP 85, SP 85 K, SP81, SP85, SP85K, SR 430, SR 430-Z, SR 440, SR 450, SR 450-Z, SR430, SR430-Z, SR430Z, SR440, SR450, SR450-Z, SR450Z
Alternate Part Numbers:
4229 121 4700, 4180-121-4700, 41801214700, 42291214700
Product Specifications
| L&S Part No. | 4180 121 4700 |
|---|---|
| Part Type | Genuine Part |
| Manufacturer | Stihl |
| OEM No. | 41801214700 |
| Unit of Sale | 1 |
| Applications | BG 45, BG 46, BG 55, BG 65, BG 85, BG45, BG46, BG50, BG55, BG65, BG85, BR 45 C, BR350, BR430, BR450, BR45C, BR500, FC 55, FC 55 DZ, FC 73, FC 75, FC 85, FC55, FC55DZ, FC73, FC75, FC85, FH 75, FH75, FR 85, FR 85 T, FR85, FR85T, FS 120, FS 200, FS 250, FS 300, FS 350, FS 38, FS 380, FS 45, FS 45 C, FS 45 L, FS 46, FS 46 C, 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, FS120, FS200, FS250, FS300, FS350, FS38, FS380, FS45, FS45C, FS45L, FS46, FS46C, 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 81, HS 81 R, HS 81 RC, HS 81 T, HS 81 TC, HS 82, HS 86, HS 86 R, HS 86 T, HS45, HS81, HS81R, HS81RC, HS81T, HS81TC, HS82, HS86, HS86R, HS86T, HT 70, HT 70 K, HT 75, HT70, HT70K, HT75, KA 120, KA 120 R, KA 250, KA 85 R, KA120, KA120R, KA250, KA250 Attachment, KA85R, KA85R Attachment, KM 55, KM 55 C, KM 55 R, KM 55 RC, KM 85, KM 85 R, KM55, KM55C, KM55R, KM55RC, KM85, KM85R, KR 85, KR85, KR85 Attachment, KW 85, KW85, MM 55, MM 55 C, MM 55 C MultiSystem, MM 55-Z MultiSystem, MM55, MM55C, MS 171, MS 181, MS 181 C, MS 211, MS 211 C, MS171, MS171C, MS181, MS181C, MS211, MS211C, MS241C, SH 55, SH 85, SH55, SH85, SP 81, SP 85, SP 85 K, SP81, SP85, SP85K, SR 430, SR 430-Z, SR 440, SR 450, SR 450-Z, SR430, SR430-Z, SR430Z, SR440, SR450, SR450-Z, SR450Z |
| Machine Type | Brushcutters, Blower/Shredders, Kombi Tools, Long Reach Hedgetrimmers, Pole Pruners, Clearing Saws, Chain Sharpeners, Petrol Hedgetrimmers |
| Fits Brands | Stihl |
| Fits Models | MS171, MS171C | MS181, MS181C | MS211, MS211C | FS38, FS45, FS46 | FS55, FS55C, FS55R | FS75, FS80, FS85 | FS120, FS200, FS250 | FS300, FS350, FS380 | BR350, BR430, BR450 | BR500 | HS45 | HS81, HS86 | HS82 | BR45C | SH55, SH85 | BG50 | FR85T, FR85 | MS241C | HT70, HT70K, HT75 | 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 | HL45 | HL75, HL75K |
