Description
Overview:
The Metering Diaphragm 1125 121 4700 is a genuine Stihl component used inside the carburettor to regulate fuel delivery to the engine. It is a thin, fuel‐resistant elastomer diaphragm with fabric reinforcement, designed to flex accurately with crankcase pulses and maintain a stable air-fuel mixture across idle, acceleration, and full load. Purpose‐made for Stihl chainsaws, it provides a precise seal and consistent movement for dependable running. It is suitable for popular models such as the MS 340 and MS 360, and helps restore smooth starting, clean pick‐up, and reliable performance in both professional and home use.
Key Features:
- Genuine Stihl part for correct fit and dependable compatibility
- Regulates fuel metering for stable idle, crisp throttle response, and full‐power running
- Fuel‐resistant diaphragm material with fabric reinforcement for durability
- Designed to withstand heat, vibration, and ethanol‐blended petrol
- Helps cure common carburettor issues such as hesitation, poor idle, or flooding
- Direct replacement for worn or stretched diaphragms; no modification needed
- Supports easy servicing with standard small‐engine tools
- Stihl part number: 1125 121 4700 for clear identification
Typical Applications:
Routine carburettor maintenance, overhaul, or repair on Stihl chainsaws where fuel delivery has become inconsistent due to age, storage, or contaminated fuel. Suitable for restoring reliable cutting performance in forestry, landscaping, arborist work, site clearance, and domestic firewood preparation. Ideal when a saw starts, stalls, surges, or fails to tune correctly.
Also known as:
Carburettor metering membrane, fuel control diaphragm, carb membrane, regulating diaphragm, chainsaw fuel metering membrane, carburettor metering sheet. Commonly used terms include chainsaw fuel control membrane and metering membrane for carburettor assemblies.
Fits Models:
034, 036, 036 QS, 036QS, 044, MS 340, MS 360, MS 360 C, MS 440, MS340, MS360, MS360C, MS440
Alternate Part Numbers:
1125-121-4700, 11251214700
Product Specifications
| L&S Part No. | 1125 121 4700 |
|---|---|
| Part Type | Genuine Part |
| Manufacturer | Stihl |
| OEM No. | 11251214700 |
| Unit of Sale | 1 |
| Machine Type | Chainsaws |
| Fits Brands | Stihl |
| Key Features | - Genuine Stihl part ensures correct fit and compatibility - Regulates fuel for stable idle and full-power running - Fuel-resistant diaphragm with fabric reinforcement - Suitable for Stihl models MS 340, MS 360, MS 440 - Direct replacement; no modification needed |
| Fits Models | MS440 | MS340 | MS360, MS360C | 034 | 036 | 036QS | 044 |
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