Description
1117 121 4700 – STIHL Carburetor Diaphragm (Genuine STIHL OEM Fuel Pump Diaphragm)
The STIHL 1117 121 4700 Diaphragm is a genuine OEM replacement carburetor diaphragm designed for compatible STIHL chainsaws. Engineered to STIHL’s exact manufacturing specifications, this precision fuel pump diaphragm regulates fuel movement inside the carburetor, ensuring consistent fuel delivery for reliable starting, smooth idling, responsive throttle performance, and maximum engine efficiency.
Manufactured from premium fuel-resistant elastomer, the 1117 121 4700 Diaphragm is designed to withstand gasoline, ethanol-blended fuels, engine heat, and continuous flexing. Replacing a worn or hardened diaphragm with a genuine STIHL OEM part helps restore proper carburetor operation and dependable engine performance.
Product Details
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Part Number: 1117 121 4700
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Brand: STIHL
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Part Type: Carburetor Diaphragm
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Function: Regulates fuel flow within the carburetor
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Material: Fuel-Resistant Synthetic Elastomer
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Installation: Direct OEM Replacement
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OEM Status: Genuine STIHL OEM Part
Key Features
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Genuine STIHL OEM carburetor diaphragm
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Precision-engineered for accurate fuel delivery
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Fuel- and ethanol-resistant material
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Flexible, durable construction
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Helps restore smooth engine operation
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Improves starting and throttle response
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Factory-correct fit
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Direct replacement with no modifications required
Function
The 1117 121 4700 Diaphragm acts as the carburetor’s fuel pump membrane, responding to engine pressure pulses to move fuel from the tank into the carburetor. Proper diaphragm operation is essential for maintaining correct fuel flow, efficient combustion, and consistent engine performance.
Compatible STIHL Equipment
The STIHL 1117 121 4700 Diaphragm fits selected STIHL chainsaws equipped with compatible carburetors utilizing OEM part number 1117 121 4700.
Common applications include selected classic STIHL models such as:
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STIHL 017
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STIHL 018
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STIHL MS 170
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STIHL MS 180
It may also fit additional STIHL equipment using the same carburetor configuration.
Always verify your equipment model, carburetor model, illustrated parts diagram, and original OEM part number before ordering to ensure proper compatibility.
Who Is This For?
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Professional arborists
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Chainsaw repair technicians
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Landscapers
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Firewood cutters
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Homeowners
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STIHL chainsaw owners
Recommended Applications
Ideal for:
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Carburetor rebuilds
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Fuel system repairs
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Hard-starting engine repairs
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Engine tune-ups
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Preventive maintenance
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Chainsaw restoration
Pros
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Genuine STIHL OEM quality
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Precision fuel metering performance
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Fuel- and ethanol-resistant material
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Restores carburetor efficiency
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Improves engine starting and throttle response
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Easy installation
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Long service life
Cons
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Compatible only with carburetors utilizing STIHL OEM part number 1117 121 4700
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Carburetor should be thoroughly cleaned and inspected before installing the new diaphragm
Comparison – STIHL 1117 121 4700 OEM Diaphragm vs Aftermarket Diaphragms
STIHL 1117 121 4700 Genuine OEM Diaphragm
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Exact OEM dimensions and flexibility
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Premium fuel-resistant material
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Consistent fuel delivery
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Superior durability
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Designed specifically for STIHL carburetors
Aftermarket Diaphragms
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May vary in thickness and flexibility
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Variable resistance to ethanol fuels
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Potential fuel metering inconsistencies
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Shorter service life
Why Buy from Barry’s Power Equipment?
Barry’s Power Equipment is an authorized STIHL dealer supplying genuine OEM replacement parts trusted by professional arborists, landscapers, and outdoor power equipment technicians.
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Genuine OEM STIHL replacement parts
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Fast nationwide shipping
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Competitive pricing
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Expert technical support
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Extensive inventory for STIHL, SCAG, Toro, Exmark, Wright, Ariens, Gravely, Ferris, Kawasaki, Kohler, Honda, Briggs & Stratton, Cub Cadet, John Deere, and many other leading outdoor power equipment brands.
