HUZTL Carburetor Replacement Kit for Stihl FS/FC/KM/HT Trimmers – Part 4180-120-0615 with Air Filter & Tune Tools

If your Stihl-powered FS, FC, KM or HT tool is hard to start, sputters under load, or idles poorly, a worn or clogged carburetor and filter assembly is often the culprit. This HUZTL kit replaces part #4180 120 0615 and includes the matching air filter (#4180 141 0300) plus common wear items so you can install and tune the unit without hunting down extra components.

Which Stihl models does this carburetor fit?

This HUZTL carburetor is designed as a direct-fit replacement for a range of Stihl two-stroke engines. It covers popular brushcutters, trimmers, pole pruners and kombi engine units where the original part number matches.

• Fits FS89, FS89R, FS91, FS91R, FS111, FS111R, FS111RX brushcutters
• Compatible with HT102 and HT103 pole pruners
• Works with KM91R and KM111R kombi engines and FC91, FC96, FC111 lawn edgers

What’s included in the HUZTL replacement kit?

The kit bundles the carburetor with the most frequently needed service parts so you can complete a basic overhaul in one repair session. That reduces downtime and avoids returns for missing pieces.

• 1 carburetor (part #4180-120-0615) and 1 compatible air filter
• 1 fuel line, 2 fuel filters, 2 gaskets and 2 primer bulbs
• 1 spark plug and 1 carburetor adjusting tool for tuning

How do I install and tune this replacement carburetor?

Installation follows standard small-engine procedures: remove the old carburetor, transfer mounting hardware or gaskets as needed, connect fuel lines and primer bulb, then set the idle and mixture with the supplied adjusting tool. Basic tuning restores throttle response and steady idle.

• Disconnect spark and drain fuel before starting work
• Replace old gaskets and filters; use new primer bulbs and fuel filters
• Use the adjusting tool to set idle and low/high speed per engine manual

Will this kit improve starting and performance?

Replacing a degraded carburetor and air filter often resolves hard starts, stalling, and power loss caused by fuel flow or air/fuel mixture issues. The included consumables help ensure the engine breathes and receives clean fuel for reliable operation.

• New air filter prevents dirt from choking the engine
• Fresh fuel line, filters and primer bulbs restore proper fuel delivery
• Adjusting tool helps you fine-tune performance after install

Who this is for: This HUZTL carburetor kit is aimed at DIYers, landscapers, and maintenance techs who own Stihl FS, FC, KM or HT series tools and need a reliable replacement that includes all routine service parts. It’s useful when the original part number 4180 120 0615 or air filter 4180 141 0300 is required and when you want to complete a swift on-site repair without sourcing multiple accessories.