Carburionix Carburetor Assembly for Stihl FS91 FS91R FS111 FS89 — 4180-120-0615 Replacement Kit with Filters & Primer Bulbs

Carburionix 4180-120-0615 is a complete replacement carburetor assembly designed to fit Stihl FS91/FS91R/FS111/FS89 series brushcutters and compatible Kombi engines.

When your trimmer or brushcutter is running rough, hard to start, or not delivering consistent throttle response, replacing the carburetor with a correct-fit assembly can restore reliable performance. This Carburionix unit ships as a ready-to-install kit that includes the carburetor plus commonly needed consumables so you can complete the repair in one service session.

Will this carburetor fit my Stihl model?

This assembly is built to replace part number 4180-120-0615 and fits multiple Stihl small-engine models. It’s compatible with FS91, FS91R, FS89, FS89R, FS111 series brushcutters and related Kombi or pole-pruner engines that share the same carburetor footprint.

• Replaces Stihl OEM 4180-120-0615 (41801200615)
• Compatible with FS91, FS91R, FS89, FS89R, FS111, FS111R, FS111RX
• Also fits KM91R/KM111R Kombi engines and HT102/HT103 pole pruners

What’s included in the kit and why it matters?

The kit contains the carburetor plus replacement parts you’ll typically need when servicing the fuel system. Including filters, gaskets, and primer bulbs reduces the chance of missing small parts and saves time sourcing components separately.

• 1 carburetor body ready for installation
• 1 air filter and 1 spark plug to refresh intake and ignition maintenance
• 2 fuel filters, 3 gaskets, 2 primer bulbs, and 1 fuel line for a full fuel-path service

How difficult is installation and what should I prepare?

Installation is straightforward for anyone comfortable with small-engine repairs and basic hand tools. You’ll want to check model compatibility first, have a spark plug wrench, screwdrivers, and pliers on hand, and follow choke/throttle linkage alignment during reassembly.

• Confirm fit using the product images and your OEM part number
• Perform a clean workspace and drain residual fuel before starting
• Check gaskets, primer bulbs, and fuel line routing when reassembling to prevent leaks

How will this affect engine performance and longevity?

Replacing a worn or clogged carburetor with a proper-fit assembly can restore smooth idling, quicker starts, and stable throttle response. While it’s not a guaranteed solution for unrelated mechanical issues, restoring proper fuel metering reduces strain caused by lean or rich running conditions.

• Restores correct fuel/air mixture when matched to the model
• New filters and gaskets help prevent contaminants from entering the engine
• Primer bulbs and fuel line ensure reliable fuel delivery on startup

Who is this for: This Carburionix carburetor kit is aimed at DIY mechanics, landscape professionals, and homeowners who maintain Stihl FS-series brushcutters, Kombi attachments, or pole pruners and need a full replacement carburetor plus service parts. If you’re replacing a failed carburetor or performing a comprehensive tune-up on compatible Stihl equipment, this ready-made kit streamlines the repair and reduces return trips for missing components. If you’re uncertain about fitment, compare the OEM part number 4180-120-0615 with your existing carburetor or contact support for guidance before ordering.