Description
Overview:
This Metering Diaphragm is a Genuine Stihl part for maintaining consistent fuel metering in diaphragm carburettors on a wide range of Stihl handheld machines. Made from a fuel‐resistant elastomer with a precision‐formed membrane, it flexes to control fuel delivery under changing engine loads and positions. Correct fuel regulation supports easy starting, stable idling and clean acceleration, helping prevent lean or rich running. Designed to meet OEM specifications, it is a direct replacement for part number 4129 121 4700 and is suitable for popular models such as the FR85T and FR85. Ideal for trimmers, brushcutters, blowers, hedge trimmers, chainsaws, Kombi engines and earth augers that use compatible Stihl carburettors.
Key Features:
- Genuine Stihl part 4129 121 4700 for assured compatibility and fit
- Fuel‐resistant diaphragm material for dependable performance
- Helps maintain correct air-fuel ratio across idle to full load
- Supports easier starting and smoother throttle response
- Robust construction for long service life in daily use
- Direct replacement design to simplify routine maintenance
- Suitable for a broad range of Stihl machines to reduce spares complexity
- Works with diaphragm carburettors commonly used on Stihl 2‐stroke engines
Typical Applications:
Routine service and repair of Stihl handheld equipment where unstable idle, hesitation, poor starting, or inconsistent running suggests a worn or stiff metering diaphragm. Common on brushcutters, clearing saws, blowers, hedge trimmers, chainsaws, Kombi engines and augers used in landscaping, grounds maintenance and construction.
Also known as:
Metering membrane, carb diaphragm, carburettor metering diaphragm, fuel metering membrane, carburettor membrane, pump/metering diaphragm.
Fits Models:
020, 020T, BG45, BG46, BG55, BG65, BG75, BG85, BR106, BT 120 C, BT 121, BT 121 Z, BT120C, BT121, BT121Z, FC 55 DZ, FC 73, FC 75, FC 85, FC55DZ, FC73, FC75, FC85, FH75, FR106, FR108, FR350, FR450, FR480, FR480C, FR85, FR85T, FS106, FS108, FS120, FS120R, FS200, FS200R, FS250, FS250R, FS300, FS350, FS38, FS380, FS400, FS45, FS450, FS46, FS480, FS55, FS55C, FS55R, FS75, FS80, FS80R, FS85, FS85R, FS85RX, FS85T, HL45, HL75, HL75K, HS45, HS75, HS80, HS85, HT70, HT70K, HT75, KM55, KM55C, KM55R, KM55RC, KM85, KM85R, KW 85, KW85, MS191T, MS192C, MS192T, MS192TC, MS200, MS200T, SH55, SH85, SP400, SP450, SP80, SP80K
Alternate Part Numbers:
4129-121-4700, 41291214700
Product Specifications
| L&S Part No. | 4129 121 4700 |
|---|---|
| Part Type | Genuine Part |
| Manufacturer | Stihl |
| OEM No. | 41291214700 |
| Unit of Sale | 1 |
| Applications | 020, 020T, BG45, BG46, BG55, BG65, BG75, BG85, BR106, BT 120 C, BT 121, BT 121 Z, BT120C, BT121, BT121Z, FC 55 DZ, FC 73, FC 75, FC 85, FC55DZ, FC73, FC75, FC85, FH75, FR106, FR108, FR350, FR450, FR480, FR480C, FR85, FR85T, FS106, FS108, FS120, FS120R, FS200, FS200R, FS250, FS250R, FS300, FS350, FS38, FS380, FS400, FS45, FS450, FS46, FS480, FS55, FS55C, FS55R, FS75, FS80, FS80R, FS85, FS85R, FS85RX, FS85T, HL45, HL75, HL75K, HS45, HS75, HS80, HS85, HT70, HT70K, HT75, KM55, KM55C, KM55R, KM55RC, KM85, KM85R, KW 85, KW85, MS191T, MS192C, MS192T, MS192TC, MS200, MS200T, SH55, SH85, SP400, SP450, SP80, SP80K |
| Machine Type | Backpack Brushcutters, Brushcutters, Chainsaws, Edging Trowel, Blower/Shredders, Electric Blower/Shredders |
| Fits Brands | Stihl |
| Fits Models | MS200, MS200T | MS192C, MS192T, MS192TC | FS38, FS45, FS46 | FS55, FS55C, FS55R | FS75, FS80, FS85 | FS120, FS200, FS250 | FS300, FS350, FS380 | FS400, FS450, FS480 | HS45 | HS75 | BG75 | BR106 | SH55, SH85 | FS106 | FS108 | FR85T, FR85 | FR106 | FR350, FR450, FR480, FR480C | FR108 | 020, 020T | HT70, HT70K, HT75 | MS191T | KM55, KM55C, KM55R, KM55RC | KM85, KM85R | KW 85 | FC 55 DZ | FC 73 | FC 75 | FC 85 | BT 120 C | BT 121 | BT 121 Z | HL45 | HL75, HL75K | BG55 | BG85 | HS80 | HS85 | SP 85 |
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