Stihl Brand [Lifetime Warranty] FS 91 R Trimmer Carburetor Kit - Compatible with STIHL FS91R FS91 FC91 FS111 FC111 KM91R KM111R HT102 FC96 Trimmer Brushcutter 4180-120-0615 Carb
Carburetor maintenance kit for STIHL FS 91 R trimmer including carburetor, air filter, spark plug, and fuel line tools.
Replacement carburetor for STIHL FS 91 R trimmer with clear primer bulb and orange cap.
FS 91 R trimmer carburetor maintenance kit including carburetor, air filter, gaskets, fuel line, spark plug, and tools.
Dimensional diagram of FS 91 R trimmer carburetor kit components including air filter, spark plug, and fuel filter.
Replacement carburetor for STIHL FS 91 R trimmer with compatibility list and part number reference.
STIHL FS 91 R trimmer carburetor diagram showing fuel lines, adjustment screws, and impulse port components.
Four-angle view of aluminum alloy carburetor for STIHL FS 91 R trimmer and brushcutter replacement.
Pleated paper air filter for STIHL FS 91 R trimmer showing 99% filtration efficiency against dust and dirt.
Carburetor adjustment tool with hexagon tip and smooth handle for STIHL FS91R trimmer carburetors.
STIHL FS 91 R trimmer carburetor repair kit showing components to fix engine starting and idling issues.
Carburetor maintenance kit for STIHL FS 91 R trimmer including carburetor, air filter, spark plug, and fuel line tools.
Replacement carburetor for STIHL FS 91 R trimmer with clear primer bulb and orange cap.
FS 91 R trimmer carburetor maintenance kit including carburetor, air filter, gaskets, fuel line, spark plug, and tools.
Dimensional diagram of FS 91 R trimmer carburetor kit components including air filter, spark plug, and fuel filter.
Replacement carburetor for STIHL FS 91 R trimmer with compatibility list and part number reference.
STIHL FS 91 R trimmer carburetor diagram showing fuel lines, adjustment screws, and impulse port components.
Four-angle view of aluminum alloy carburetor for STIHL FS 91 R trimmer and brushcutter replacement.
Pleated paper air filter for STIHL FS 91 R trimmer showing 99% filtration efficiency against dust and dirt.
Carburetor adjustment tool with hexagon tip and smooth handle for STIHL FS91R trimmer carburetors.
STIHL FS 91 R trimmer carburetor repair kit showing components to fix engine starting and idling issues.
Lifetime Warranty

[Lifetime Warranty] FS 91 R Trimmer Carburetor Kit - Compatible with STIHL FS91R FS91 FC91 FS111 FC111 KM91R KM111R HT102 FC96 Trimmer Brushcutter 4180-120-0615 Carb

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FS 91 R Trimmer Carburetor Kit

Key Features

  • Complete replacement kit includes carburetor, air filter, fuel filter, fuel lines, grommet, primer bulb, and spark plug.
  • Designed as a direct-fit replacement for the original equipment manufacturer part.
  • Pre-calibrated from the factory; minor adjustments may be necessary for optimal performance based on altitude and fuel mixture.

Replaces / Cross-Reference Part Numbers

  • 4180-120-0615
  • 4180 120 0615
  • 41801200615

Compatibility & Fitment

  • STIHL Trimmers / Brushcutters: FS89, FS89R, FS91, FS91R, FS111, FS111R, FS111RX
  • STIHL Edgers: FC91, FC96, FC111
  • STIHL Kombi Engines: KM91, KM91R, KM111, KM111R
  • STIHL Pole Pruners: HT102, HT103

When to Replace

  • Engine fails to start or experiences difficult starting.
  • Engine stalls frequently, idles roughly, or will not hold an idle.
  • Noticeable loss of power or poor acceleration during operation.
  • Fuel leaks from the carburetor body.
  • Excessive black smoke emitted from the exhaust.

Installation Tips

  • Verify compatibility with your specific model number before starting installation.
  • Drain all fuel from the tank before servicing the fuel system.
  • Document the routing of fuel lines and throttle linkage with photos before disassembly.
  • It is recommended to replace the fuel filter and fuel lines when installing a new carburetor.
  • After installation, check for fuel leaks and start the engine. Adjust idle and fuel mixture screws as needed for smooth operation.
Brand Model Number
Replaces 4180-120-0615, 4180-120-0613
Trimmers/Brushcutters FS 89, FS 91, FS 91 R, FS 111, FS 111 R, FS 111 RX
Kombi Systems KM 91 R, KM 111 R
Pole Pruners HT 102, HT 103
Edgers FC 91, FC 96, FC 111
Note Please check your model number and measurements before ordering to ensure the correct replacement for your fs91r carburetor.

FAQ

Based on the title and matching cross-references, this kit is commonly used with STIHL FS91R, FS91, FC91, FS111, FC111, KM91R, KM111R, HT102, and FC96 units. Search results also consistently associate 4180-120-0615 with STIHL FS89, FS89R, FS111R, FS111RX, HT103, and KM91. Because STIHL used similar carburetors across several machines, the safest match is to confirm your original carburetor part number before ordering.
The main carburetor number shown for this kit is 4180-120-0615. Search results also repeatedly reference 4180-120-0618 as a related replacement number used on similar STIHL models, so it is worth comparing that number against your original carburetor. If your kit includes an air filter, the filter number commonly paired with this setup is 4180-141-0300.
Typical carburetor-related symptoms on STIHL trimmers, edgers, Kombi engines, and pole pruners include hard starting, surging at idle, stalling when you open the throttle, bogging under load, fuel leakage, or an engine that only runs with the choke partially on. If fresh fuel, a clean air filter, and a good spark plug do not correct those issues, the carburetor may be restricted or worn internally.
The most common cause is stale ethanol-blended fuel, which leaves varnish inside the metering passages and can stiffen the internal diaphragm. Long storage with fuel in the tank, contaminated fuel, and cracked fuel lines can also cause lean running or poor fuel delivery. On machines used in dusty trimming conditions, a dirty air filter can also affect fuel-air balance and engine performance.
For someone comfortable with small-engine service, this is usually a moderate repair that takes about 30 to 60 minutes. Typical tools include Torx drivers, a screwdriver, needle-nose pliers, and possibly a pick for fuel lines or linkage removal. Before disassembly, take clear photos of the throttle linkage, fuel line routing, and primer or vent connections so the new carburetor goes back in the same way.
Check the fuel tank for old fuel or debris, inspect the fuel lines for cracks or softness, and replace the air filter if it is dirty. It is also smart to inspect the intake gasket surfaces and make sure the spark arrestor screen is not plugged, because a restricted exhaust can mimic carburetor problems. If the kit includes an air filter, verify the filter number matches 4180-141-0300 before installation.
It can if the cause is fuel starvation inside the carburetor, such as a clogged metering circuit or hardened diaphragm. However, the same symptom can also come from a blocked tank vent, split fuel line, restricted fuel filter, or air leak at the intake. If your machine briefly runs on choke but dies when choke is opened, that often points to a carburetion or fuel-delivery issue.