Best Seller FS250 Carburetor - Fits FS250R FS120 FS120R FS200 - Replaces 4134-120-0603
FS250 carburetor tune-up kit including fuel line, air filter, spark plug, gaskets, and primer bulb for string trimmers.
FS250 carburetor replacement kit including gaskets, spark plug, fuel filter, primer pump, air filter, and fuel lines.
FS250 carburetor replacement kit with fuel line, spark plug, air filter, and gaskets for string trimmers.
FS250 carburetor and air filter replacement kit with labeled dimensions for Stihl string trimmers.
FS250 carburetor replacement part shown with a portable generator to illustrate common engine repair symptoms.
FS250 carburetor diagram highlighting vent tube, primer bulb line, low speed screw, high speed screw, and fuel inlet.
FS250 carburetor replacement showing aluminum alloy construction and close-up details of fuel intake and throttle linkage.
FS250 carburetor replacement kit for Stihl string trimmers and drill augers with compatibility list graphic.
FS250 carburetor tune-up kit including carburetor, air filter, fuel lines, spark plug, and gaskets for string trimmers.
FS250 carburetor tune-up kit including fuel line, air filter, spark plug, gaskets, and primer bulb for string trimmers.
FS250 carburetor replacement kit including gaskets, spark plug, fuel filter, primer pump, air filter, and fuel lines.
FS250 carburetor replacement kit with fuel line, spark plug, air filter, and gaskets for string trimmers.
FS250 carburetor and air filter replacement kit with labeled dimensions for Stihl string trimmers.
FS250 carburetor replacement part shown with a portable generator to illustrate common engine repair symptoms.
FS250 carburetor diagram highlighting vent tube, primer bulb line, low speed screw, high speed screw, and fuel inlet.
FS250 carburetor replacement showing aluminum alloy construction and close-up details of fuel intake and throttle linkage.
FS250 carburetor replacement kit for Stihl string trimmers and drill augers with compatibility list graphic.
FS250 carburetor tune-up kit including carburetor, air filter, fuel lines, spark plug, and gaskets for string trimmers.

FS250 Carburetor - Fits FS250R FS120 FS120R FS200 - Replaces 4134-120-0603

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FS250 Replacement Carburetor

Key Features

  • Precision-engineered to deliver an optimal air-fuel mixture for efficient engine performance and reliable operation.
  • Constructed from high-quality, corrosion-resistant metals to withstand continuous outdoor use and harsh fuel environments.
  • Direct-fit design ensures consistent starting, smooth acceleration, and stable idling.
  • Designed to fully restore original equipment power and fuel efficiency.

Replaces / Cross-Reference Part Numbers

  • 4134-120-0651
  • 4134-120-0603
  • 4134-120-0653
  • C1Q-S51C
  • C1Q-S36G
  • C1Q-S35B
  • C1Q-S138
  • C1Q-S139
  • C1Q-S82
  • C1Q-S83

Compatibility & Fitment

  • Compatible with select string trimmers, weed eaters, clearing saws, and earth augers.
  • Fits FS series models: FS120, FS120R, FS200, FS200R, FS202, FS250, FS250R, FS300, FS350.
  • Fits BT and SP series models: BT120, BT120C, BT121, SP200.
  • Fits FR and TS series models: FR350, FR450, FR480, TS200.

When to Replace

  • The engine is difficult to start, stalls frequently, or dies immediately after turning over.
  • The equipment experiences rough idling, bogs down under load, or lacks power during acceleration.
  • Fuel is leaking directly from the carburetor body or the surrounding gasket area.
  • The engine will only stay running when the choke is partially or fully engaged.

Installation Tips

  • Completely drain the fuel tank and clear the fuel lines before removing the old carburetor.
  • Inspect and replace the mounting gasket and fuel filter during installation to ensure a proper vacuum seal and clean fuel flow.
  • Photograph or take note of the original fuel line routing and throttle linkage positions prior to disassembly.
  • Minor adjustments to the high and low mixture screws may be required to fine-tune engine performance after installation.
FS250 Carburetor - Fits FS250R FS120 FS120R FS200 - Replaces 4134-120-0603 1
FS250 Carburetor - Fits FS250R FS120 FS120R FS200 - Replaces 4134-120-0603 2
FS250 Carburetor - Fits FS250R FS120 FS120R FS200 - Replaces 4134-120-0603 3
FS250 Carburetor - Fits FS250R FS120 FS120R FS200 - Replaces 4134-120-0603 4
FS250 Carburetor - Fits FS250R FS120 FS120R FS200 - Replaces 4134-120-0603 5
  • FS250 Carburetor - Fits FS250R FS120 FS120R FS200 - Replaces 4134-120-0603 1

    FIXING SYMPTOMS

    Engine won't start | It starts, then stalls | Poor fuel efficiency or black smoke | Fuel leaks/ Gas leaks
  • FS250 Carburetor - Fits FS250R FS120 FS120R FS200 - Replaces 4134-120-0603 2

    DURABLE MATERIAL

    This part is made of lightweight and robust aluminum alloy which is flexibility and flame-retardant, enhancing durability
  • FS250 Carburetor - Fits FS250R FS120 FS120R FS200 - Replaces 4134-120-0603 3

    BEST SOLUTION

    Enjoy the great feeling when your generator is repaired and works like before - BlueStars brings DIY solutions to help you deal with any trouble
  • FS250 Carburetor - Fits FS250R FS120 FS120R FS200 - Replaces 4134-120-0603 4

    SIMPLE INSTALLATION

    The Carburetor Kit is designed to be easily removed and replaced, allowing for quick and convenient maintenance
THE REPLACEMENT PART THAT KEEP YOUR YARD LOOKING FRESH!

THE REPLACEMENT PART THAT KEEP YOUR YARD LOOKING FRESH!

Compatible Models

Locate the model number of your appliance or equipment on the manufacturer's label and use it to check compatibility before ordering

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FAQs

This carburetor is commonly used on STIHL 2-stroke equipment including FS250, FS250R, FS120, FS120R, FS200, FS200R, FS202, FS300, FS350, BT120, BT120C, BT121, SP200, FR350, FR450, FR480, and TS200 models. Because some model families were built in multiple versions, the safest check is to match your original carburetor part number and compare the throttle/choke linkage layout before ordering.
The main replacement number is 4134 120 0603. Common cross-references found for this carburetor family include 4134 120 0652, 4134 120 0653, 4134 120 0651, 4134 400 1301, 4134 141 0300, 1110 400 7005, 4134 123 7500, 4134 129 0900, 4128 129 0900, 4130 350 6200, and 0000 930 2802. If your original carburetor or service records show one of these numbers, this is a strong compatibility indicator.
Typical carburetor-related symptoms include hard starting, needing choke to keep running, surging at idle, bogging under throttle, poor acceleration, fuel leaking from the carb, and an engine that starts then dies. On trimmers, brushcutters, cut-off saws, and augers, you may also notice loss of power under load or inconsistent high-speed operation after the unit warms up.
The most common causes are stale fuel, ethanol-related varnish buildup, debris from an aging fuel line or tank, and stiffened internal diaphragms from storage. Restricted fuel filters and air leaks at old gaskets can create similar symptoms. If the machine sat unused with fuel in it, the carburetor metering circuits are often the first place to clog.
For someone familiar with small-engine service, installation is usually straightforward and often takes about 20 to 45 minutes. Basic tools typically include screwdrivers, a nut driver or socket set, needle-nose pliers, and a pick for fuel lines or linkage if needed. Take photos before removal so you can reconnect the throttle linkage, choke parts, fuel lines, and primer-related routing correctly.
Inspect the fuel lines for cracking or softness, replace a dirty in-tank fuel filter, and check the air filter and intake gaskets. If the old carb failed from varnish or debris, flushing the fuel tank and using fresh fuel mix can help prevent repeat problems. Also verify that the impulse passage and mounting surfaces are clean so the new carburetor can meter fuel correctly.
Match both the machine model and the carburetor number stamped on the original unit when possible. Compare the mounting pattern, choke lever position, fuel inlet orientation, and throttle linkage arrangement. On older STIHL equipment, the same model name can appear with different carburetor setups, so physical comparison and part-number matching are the best final checks.