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STIHL 4226 121 2700 Primer Bulb / Cap
The STIHL 4226 121 2700 Primer Bulb is an OEM replacement primer bulb / cap used on select STIHL carburetor assemblies. A worn, cracked, leaking, or stiff primer bulb can make equipment harder to start and may prevent fuel from properly priming the carburetor.
This part is commonly searched as STIHL 4226 121 2700, STIHL 42261212700, STIHL primer bulb, STIHL carburetor primer bulb, STIHL purge bulb, STIHL primer cap, or STIHL fuel primer bulb replacement.
This primer bulb is used across many STIHL handheld equipment models, including select trimmers, brushcutters, blowers, shredder vacs, hedge trimmers, Kombi engines, pole pruners, edgers, augers, Yard Boss units, and sprayers.
Always verify your exact STIHL model, serial number, carburetor number, and parts diagram before ordering. Do not order by model family alone because primer bulb fitment can vary by carburetor version.
Product Details
| Brand | STIHL |
|---|---|
| Part Number | 4226 121 2700 |
| Compact Part Number | 42261212700 |
| Product Type | Primer Bulb / Cap |
| Common Diagram Section | Carburetor |
| OEM / Aftermarket | OEM STIHL replacement part |
| Common Equipment | Select STIHL trimmers, brushcutters, blowers, hedge trimmers, Kombi engines, pole pruners, edgers, augers, and handheld equipment |
Key Features
- OEM STIHL primer bulb / cap replacement
- Part number 4226 121 2700
- Also searched as 42261212700
- Used on select STIHL carburetor assemblies
- Helps prime fuel into the carburetor for easier starting
- Replacement for worn, cracked, leaking, or hardened primer bulbs
- Fits many STIHL handheld equipment applications when listed in the correct parts diagram
Fits Select STIHL Models
The following model references are based on supplied where-used information. Always confirm your exact model, serial number, carburetor number, and parts diagram before ordering.
Trimmers / Brushcutters
- FS 38
- FS 40 C-E
- FS 45
- FS 45 C-E
- FS 45 D
- FS 46
- FS 46 C-E
- FS 50 C-E L
- FS 55
- FS 55 R
- FS 55 RC-E
- FS 56 C-E
- FS 56 RC-E
- FS 70 R
- FS 70 RC-E
- FS 75
- FS 80
- FS 80 R
- FS 85
- FS 85 R
- FS 85 RX
- FS 90
- FS 90 R
- FS 91
- FS 91 R
- FS 91.0
- FS 100 RX
- FS 110
- FS 110 R
- FS 110 RX
- FS 111
- FS 111 R
- FS 111 RX
- FS 130
- FS 130 R
- FS 131
- FS 131 R
- FS 131.0
- FS 131.0 R
- FS 310
- FS 311
- FS 360 C-E
- FS 360 C-EM
- FS 361 C-EM
- FS 461 C-EM
Blowers / Shredder Vacs
- BG 45
- BG 45 C KAT
- BG 46
- BG 46 C KAT
- BG 50
- BG 55
- BG 55 C KAT
- BG 56 C-E
- BG 65
- BG 66
- BG 75
- BG 85
- BG 85 C KAT
- BG 86
- BG 86 C-E
- BR 45 C
- BR 200
- SH 55
- SH 56 C-E
- SH 85
- SH 85-D
- SH 86 C-E
Hedge Trimmers / Long-Reach Hedge Trimmers
- HS 45
- HS 75
- HS 80
- HS 81 R
- HS 81 T
- HS 81 TC-E
- HS 82 R
- HS 82 T
- HS 85
- HS 86 R
- HS 86 T
- HS 87 R
- HS 87 T
- HL 45
- HL 45-D
- HL 56 K
- HL 75
- HL 75 K
- HL 90 K
- HL 100
- HL 100 K
KombiSystem Engines
- KM 55 R
- KM 55 RC-E
- KM 56 RC-E
- KM 85 R
- KM 90 R
- KM 91 R
- KM 110 R
- KM 111 R
- KM 130 R
- KM 131 R
Pole Pruners
- HT 56 C-E
- HT 70
- HT 75
- HT 100
- HT 101
- HT 102
- HT 103
- HT 105
- HT 130
- HT 131
- HT 132
- HT 133
- HT 134
- HT 135
Edgers
- FC 55
- FC 55-D
- FC 56 C-E
- FC 70
- FC 70 C-E
- FC 75
- FC 85
- FC 90
- FC 91
- FC 95
- FC 96
- FC 100
- FC 110
- FC 111
Other STIHL Equipment
- BT 45
- BT 130
- BT 131
- FB 131
- MM 55
- MM 55 C-E
- MM 56 C-E Yard Boss
- SR 200
- KW 85
Common Carburetor References
Supplied fitment data shows this primer bulb used in many STIHL carburetor diagrams, including select C1Q, C1M, and STIHL carburetor assembly references. Match your original carburetor and parts diagram before ordering.
- C1Q-S29, C1Q-S30, C1Q-S50, C1Q-S55, C1Q-S64, C1Q-S70, C1Q-S71, C1Q-S72, C1Q-S73, C1Q-S74
- C1Q-S79, C1Q-S88, C1Q-S97, C1Q-S98, C1Q-S110, C1Q-S112, C1Q-S130, C1Q-S131, C1Q-S132
- C1Q-S153, C1Q-S157, C1Q-S169, C1Q-S170, C1Q-S173, C1Q-S174, C1Q-S175, C1Q-S176, C1Q-S186
- C1Q-S196, C1Q-S197, C1Q-S198, C1Q-S202, C1Q-S218, C1Q-S225, C1Q-S292
- C1M-S141, C1M-S142, C1M-S144, C1M-S146, C1M-S203, C1M-S204, C1M-S205, C1M-S208, C1M-S228, C1M-S244, C1M-S260, C1M-S267
- STIHL carburetor assembly references 4137, 4140, 4144, 4147, 4180, 4229, 4237, and 4241 where this part is listed
When to Replace a Primer Bulb
- Primer bulb is cracked, split, stiff, cloudy, or leaking fuel
- Bulb will not fill with fuel when pressed
- Bulb stays collapsed or does not return to shape
- Equipment is hard to start because fuel is not priming properly
- Fuel leaks around the primer area
- Your STIHL parts diagram lists part number 4226 121 2700
Important Fitment Notes
- This listing is for STIHL part number 4226 121 2700
- Verify your exact model, serial number, and carburetor diagram before ordering
- Confirm your original primer bulb shape, mounting style, and carburetor number
- Do not order by equipment model alone because carburetor versions can vary
- Some models have multiple carburetor options depending on production date and serial range
- Fuel lines, carburetor, gaskets, screws, and other components are not included unless shown or stated
Installation and Service Notes
Shut the engine off and allow the unit to cool before servicing the carburetor or fuel system. Work in a well-ventilated area away from sparks, flames, or ignition sources.
- Inspect the fuel lines, fuel filter, tank vent, carburetor, and primer area during service
- Replace cracked or hardened fuel lines as needed
- Clean dirt and debris away from the carburetor before removing parts
- Confirm the primer bulb seats and seals correctly after installation
- Check for fuel leaks before operating the equipment
- Follow the STIHL service instructions for your exact model
Part Number / Search Terms
- STIHL 4226 121 2700
- STIHL 42261212700
- 4226 121 2700 primer bulb
- STIHL primer bulb
- STIHL purge bulb
- STIHL primer cap
- STIHL carburetor primer bulb
- STIHL fuel primer bulb
- STIHL trimmer primer bulb
- STIHL blower primer bulb
- STIHL hedge trimmer primer bulb
- STIHL Kombi primer bulb
- STIHL pole saw primer bulb
- STIHL edger primer bulb
- STIHL FS 55 primer bulb
- STIHL FS 56 primer bulb
- STIHL FS 70 primer bulb
- STIHL FS 91 primer bulb
- STIHL FS 111 primer bulb
- STIHL FS 131 primer bulb
- STIHL BG 55 primer bulb
- STIHL BG 56 primer bulb
- STIHL BG 86 primer bulb
- STIHL SH 86 primer bulb
- STIHL HS 45 primer bulb
- STIHL KM 56 primer bulb
- STIHL KM 91 primer bulb
- STIHL FC 56 primer bulb
- OEM STIHL carburetor parts
Frequently Asked Questions
What is STIHL 4226 121 2700?
STIHL 4226 121 2700 is an OEM primer bulb / cap used on select STIHL carburetor assemblies.
Is 42261212700 the same as 4226 121 2700?
Yes. 42261212700 is the compact part number format commonly used when searching for STIHL part number 4226 121 2700.
Does this fit STIHL FS trimmers?
This primer bulb is listed for many select FS trimmer and brushcutter models, including FS 38, FS 45, FS 55, FS 56, FS 70, FS 90, FS 91, FS 111, FS 130, and FS 131 applications. Always verify your exact carburetor and parts diagram.
Does this fit STIHL blowers?
This part is listed for select BG, BR, and SH blower or shredder vac applications, including many BG 45, BG 55, BG 56, BG 85, BG 86, BR 200, SH 55, SH 56, SH 85, and SH 86 models. Confirm your model and carburetor before ordering.
Can I order this by equipment model alone?
No. STIHL models can use different carburetors depending on serial range and production version. Confirm the original primer bulb, carburetor number, and parts diagram before ordering.
What are signs of a bad primer bulb?
Common signs include a cracked or leaking bulb, a bulb that will not fill with fuel, a bulb that stays collapsed, hard starting, or fuel leaking around the carburetor primer area.
P&P Small Engines stocks OEM STIHL primer bulbs, carburetor parts, fuel lines, fuel filters, spark plugs, air filters, trimmer parts, blower parts, edger parts, and professional outdoor power equipment replacement parts.
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