String Trimmer Honda Carburetor 16100-Z0Z-034 - for GX35 GX35NT Engine, HHT35S UMK435 String Trimmer Brushcutter
GX35 carburetor replacement kit with spark plug, air filter, fuel line, and gasket for Honda string trimmers.
GX35 replacement carburetor for Honda string trimmers shown with a person using a brushcutter in a garden.
GX35 carburetor replacement kit including spark plug, fuel filter, air cleaner, fuel hose, primer bulb, and gasket.
GX35 carburetor replacement kit with dimensional specifications, fuel filter, spark plug, and mounting gasket.
Replacement carburetor for Honda GX35 and GX25 engines with compatibility and part number information overlay.
Diagram of GX35 carburetor showing fuel lines, impulse port, idle mixture screw, and idle speed screw components.
Multi-angle view of GX35 replacement carburetor for Honda string trimmers and brushcutters.
Fuel line assembly with filter and grommet for Honda GX35 and GX25 series string trimmers and brushcutters.
Infographic showing a Honda GX35 engine tiller and common symptoms fixed by a carburetor replacement.
GX35 carburetor replacement kit with spark plug, air filter, fuel line, and gasket for Honda string trimmers.
GX35 replacement carburetor for Honda string trimmers shown with a person using a brushcutter in a garden.
GX35 carburetor replacement kit including spark plug, fuel filter, air cleaner, fuel hose, primer bulb, and gasket.
GX35 carburetor replacement kit with dimensional specifications, fuel filter, spark plug, and mounting gasket.
Replacement carburetor for Honda GX35 and GX25 engines with compatibility and part number information overlay.
Diagram of GX35 carburetor showing fuel lines, impulse port, idle mixture screw, and idle speed screw components.
Multi-angle view of GX35 replacement carburetor for Honda string trimmers and brushcutters.
Fuel line assembly with filter and grommet for Honda GX35 and GX25 series string trimmers and brushcutters.
Infographic showing a Honda GX35 engine tiller and common symptoms fixed by a carburetor replacement.
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Honda Carburetor 16100-Z0Z-034 - for GX35 GX35NT Engine, HHT35S UMK435 String Trimmer Brushcutter

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16100-Z0Z-034 GX35 Carburetor

Key Features

  • Direct-fit replacement for specified Honda 4-cycle small engines.
  • Regulates the air and fuel mixture for efficient engine operation.
  • Designed to meet original equipment manufacturer specifications for fit and performance.

Replaces / Cross-Reference Part Numbers

  • Honda: 16100-ZOZ-034, 16100-Z0Z-815, 16100-Z0H-053, 16100-Z0H-825, 16100-Z0H-824, 16100-Z0H-043, 16100-202-815
  • Walbro: WYB-16C

Compatibility & Fitment

  • Engine Models:
    • Honda GX25
    • Honda GX25N
    • Honda GX25NT
    • Honda GX35
    • Honda GX35NT
  • Equipment Models:
    • String Trimmers / Brushcutters: HHT25S, HHT35, HHT35S, UMK435, UMC435
    • Rototillers: FG110, FG110K1

When to Replace

  • Engine will not start or is difficult to start.
  • Engine runs rough, stalls, or has an unstable idle.
  • Noticeable loss of power or poor acceleration.
  • Black smoke emits from the exhaust.
  • Fuel is leaking from the carburetor body.

Installation Tips

  • Before ordering, verify your engine model and original carburetor part number.
  • For safety, disconnect the spark plug wire before beginning work.
  • Take a photograph of the fuel line and linkage connections on the old carburetor for reference.
  • Clean the mating surface on the engine block before installing the new carburetor and gasket.
  • Consider replacing aged or cracked fuel lines and the fuel filter during installation.
  • Fine-tuning of the idle and mixture screws may be required to achieve optimal performance.

FAQ

This carburetor is compatible with Honda GX35, GX35NT, GX25, GX25N, and GX25NT engines, as well as Honda HHT35S, HHT25S, and UMK435 trimmer and brushcutter applications. It is also used with GX35 type codes including GX35 Type SA2, SA2A, SAT, SATA, SLT and GX35NT Type S3, SATM, SGT3, SGT9, and ST3. Because Honda used several carburetor versions across similar engines, match the part number on your old carburetor before ordering.
This unit replaces OEM part numbers 16100-Z0Z-034, 16100-202-815, and Walbro WYB-16C. It also serves as a direct replacement for 16100-Z0Z-815, 16100-Z0H-053, 16100-Z0Z-004, 16100Z0Z814, and 16100Z6K801. The safest way to confirm fit is to compare both your engine model and the number stamped on the original carburetor.
Common carburetor-related symptoms on GX25/GX35-powered trimmers and brushcutters include hard starting, needing the choke to stay running, surging at idle, bogging when you open the throttle, fuel leaking, poor acceleration under load, or an engine that starts and dies after a few seconds. If fresh fuel, a clean air filter, and a good spark plug do not correct the problem, the carburetor may have a plugged metering circuit, stiff diaphragm, worn needle, or internal varnish buildup.
The most common cause is stale fuel, especially fuel containing ethanol. Ethanol can attract moisture, leave varnish in the jets and passages, and harden the diaphragm and gaskets over time. Long storage with fuel left in the system is a frequent root cause. On handheld equipment, dirt from deteriorated fuel lines, a restricted tank vent, or a clogged in-tank fuel filter can also cause lean running and repeat carburetor problems.
For most Honda GX25/GX35 trimmer and brushcutter setups, installation is a moderate repair that usually takes about 20 to 45 minutes. Typical tools are a screwdriver set, needle-nose pliers, a small socket or nut driver set, and possibly hemostats or fuel-line pliers for the hoses. Take photos before removal so the throttle linkage, breather lines, and fuel lines go back in the same positions. After installation, check for smooth throttle movement and fuel leaks before starting.
Check the fuel tank for old fuel, inspect the fuel lines for cracks or soft spots, and replace a dirty in-tank fuel filter if flow is weak. Also inspect the air filter and the carburetor mounting gasket. The gasket part number for GX35/HHT35S/UMK435 applications is 16221-Z0Z-000; if your old gasket is brittle, torn, or compressed, replace it at the same time. A bad gasket or leaking intake joint can cause the same lean-running symptoms as a failing carburetor.
Not always. Honda used multiple carburetor variations across GX25/GX35 engines and equipment configurations. Even when the base engine is the same, throttle linkage shape, primer arrangement, and part-number supersessions can differ by trimmer, brushcutter, blower, or hedge-cutter application. Use the engine model, equipment model, and the carburetor number on your original unit to verify a correct match.