Description
Overview:
This metering diaphragm is a genuine Stihl part designed for the carburettor of Stihl cut-off saws, including TS 410 and TS 420. Made from a flexible, fuel‐resistant elastomer, it acts as a precise membrane to control fuel delivery in the metering chamber. By responding to pressure changes inside the carburettor, it regulates the needle valve and maintains a consistent fuel mixture for reliable running. The diaphragm helps ensure easier starting, a steady idle and clean acceleration under load. Stihl Manufacturer Part Number (MPN): 4238 121 4700. Built for demanding site conditions, it is suitable for routine servicing or as a direct replacement when the original becomes stiff, worn, or damaged through age, heat, or fuel contamination.
Key Features:
- Genuine Stihl OEM component (MPN 4238 121 4700) for correct fit and function
- Precision-formed membrane maintains accurate fuel level in the metering chamber
- Fuel- and oil-resistant elastomer suitable for everyday pump petrol (E5/E10)
- Helps restore easy starting, stable idle and responsive throttle performance
- Reduces risks of flooding, lean running, hesitation and flat spots
- Manufactured to OEM thickness and profile for reliable needle control
- Straightforward to fit during a standard carburettor service; no special tools
- Durable construction to withstand vibration, dust, and high operating temperatures
- Suitable for regular maintenance to support long service life of the saw
Typical Applications:
Used during carburettor maintenance or rebuilds on Stihl cut-off saws in construction, landscaping and utility work. Replace the diaphragm if the engine is hard to start, hunts at idle, bogs on acceleration, or after long storage when the membrane can stiffen. Helps maintain smooth performance when cutting concrete, asphalt or masonry on site.
Also known as:
Carburettor metering diaphragm, fuel metering membrane, carb diaphragm, carburettor diaphragm, metering chamber diaphragm, carb repair part, diaphragm for carb rebuild kits.
Fits Models:
TS 410, TS 420, TS 440
Alternate Part Numbers:
4238-121-4700, 42381214700
Product Specifications
L&S Part No. | 4238 121 4700 |
---|---|
Part Type | Genuine Part |
Manufacturer | Stihl |
OEM No. | 42381214700 |
Unit of Sale | 1 |
Applications | TS 410, TS 420, TS 440, TS410, TS420, TS440 |
Fits Brands | Stihl |
Fits Models | TS410, TS420 | TS440 |