Stihl Carburetor Primer Bulb 4226 121 2700 – 5 Pack

Stihl Replacement Carburetor Primer Bulb – Part No. 4226 121 2700

Keep your Stihl outdoor power equipment running at peak performance with this direct-fit replacement carburetor primer bulb. Engineered to match OEM specifications, this primer bulb restores reliable fuel priming to your trimmer, blower, hedger, or pole pruner — getting your machine started quickly and consistently. Each pack includes 5 primer bulbs, so you'll always have a spare on hand for the season ahead.

Key Specifications

• Part Number: 4226 121 2700
• Inner Diameter (ID): 16.2 mm
• Outer Diameter (OD): 18.7 mm
• Height (H): 19 mm
• Lip Diameter: 21.7 mm
• Package Contents: 5 × Primer Bulbs

Wide Model Compatibility

This primer bulb is compatible with a broad range of Stihl models, including:

BG Series: BG45, BG46-DZ, BG46-Z, BG55, BG56, BG66C-E-D, BG75, BG85, BG86, BG86C-E

BR / BT / FR Series: BR200, BT130, BT45, FR130T

FS Series: FS38, FS38Z, FS40C-E, FS40C-EZ, FS40-Z, FS45, FS45C-E, FS45C-EDZ, FS45C-EZ, FS45D-Z, FS45L, FS45-Z, FS46C-EDZ, FS46C-EZ, FS46-DZ, FS46-Z, FS50, FS50C-E, FS50C-EL, FS50C-ELZ, FS50L, FS50-LZ, FS55, FS55R, FS56, FS56C-E, FS56R, FS56RC-E, FS70C-E, FS70RC-E, FS70RC-EZ, FS75, FS80 (Newer), FS80 (Old Pre 90s), FS80R, FS85, FS85R, FS85RX, FS85T, FS87, FS87R, FS90, FS90R, FS90R-Z, FS90-Z, FS100, FS110, FS310

HL Series: HL45, HL75, HL75K, HL90K, HL95, HL95K, HL100, HL100K

HS Series: HS45, HS75, HS80, HS81R, HS81T, HS82RC-E, HS82T, HS85, HS86R, HS86T, HS87R, HS87T

HT Series: HT100, HT101, HT130, HT131

KM Series: KM55, KM56C-E, KM56RC-E, KM56RC-EZ, KM85, KM85R, KM90, KM90R, KM100, KM100R, KM110R, KM130, KM130R

MM / SH Series: MM55, SH55, SH56C-EZ, SH56C-ED, SH56-D, SH85, SH86C-E, SH86C-ED, SH86C-EZ, SH86-D

Why Choose This Primer Bulb?

• ✅ Precise OEM-Spec Fit: Dimensionally matched to the original part for a secure, leak-free seal
• ✅ Durable Construction: Made from flexible, fuel-resistant material that holds up to regular use and outdoor conditions
• ✅ Easy Installation: Snaps into place with no special tools required — a straightforward DIY repair
• ✅ Great Value Pack: 5 bulbs per pack ensures you're covered for multiple machines or future replacements
• ✅ Broad Compatibility: Fits dozens of Stihl trimmers, blowers, hedgers, and more

Installation Tips

Before installing, ensure the carburetor and surrounding area are clean and free of debris. Remove the old primer bulb by carefully prying it out of its seat. Press the new bulb firmly into the retaining ring until it clicks securely into place. Check all fuel lines for cracks or wear while you have the carburetor accessible — a great time to inspect and service your equipment.

For more information on safe outdoor power equipment maintenance, visit the U.S. Consumer Product Safety Commission – Outdoor Power Equipment Safety.

Note: Product colour may vary slightly from images shown due to monitor display settings and lighting conditions.

Frequently Asked Questions

Q: What Stihl models is this carburetor primer bulb compatible with?

A: This replacement primer bulb (Part No. 4226 121 2700) is compatible with a wide range of Stihl outdoor power equipment, including models in the FS, HS, BG, KM, HL, HT, SH, MM, BR, BT, and FR series. Key compatible models include the FS38, FS45, FS55, FS85, HS45, HS80, KM85, KM110R, BG55, SH55, and many more. Please refer to the full compatibility list above to confirm your model is included.

Q: What are the dimensions of this primer bulb?

A: The primer bulb has an Inner Diameter (ID) of 16.2 mm, an Outer Diameter (OD) of 18.7 mm, a Height (H) of 19 mm, and a Lip Diameter of 21.7 mm. These dimensions match the OEM Stihl part specification for part number 4226 121 2700, ensuring a proper fit in compatible carburetors.

Q: How many primer bulbs are included in each pack?

A: Each pack contains 5 replacement primer bulbs, giving you excellent value and ensuring you have backups ready for future maintenance or for use across multiple pieces of Stihl equipment.

Q: Do I need special tools to install this primer bulb?

A: No special tools are required. The primer bulb snaps into the carburetor's retaining ring by hand. Simply remove the worn bulb and press the new one firmly into place until it seats securely. Always refer to your equipment's service manual if you are unsure of the installation process.