[Lifetime Warranty] BP42 Carburetor - Compatible with Ryobi RY08420 RY08420A RY42WB RY42BPEMC Backpack Leaf Blower - Replaces 308054093 308054079 WT-1086 Carb with Air Filter Fuel Filter Spark Plug Primer Bulb
BP42 carburetor kit for Ryobi backpack leaf blowers including air filter, fuel filter, spark plug, and fuel lines.
BP42 carburetor replacement for Ryobi backpack leaf blowers with white throttle lever and fuel efficiency graphic.
BP42 carburetor kit for Ryobi leaf blowers including carburetor, air filter, fuel filter, spark plug, bulb, and gaskets.
Dimensional diagram of BP42 carburetor, air filter, and spark plug for Ryobi backpack leaf blowers.
BP42 carburetor for Ryobi backpack leaf blowers shown with compatibility and part number information.
BP42 carburetor diagram for Ryobi backpack leaf blowers showing idle screw, vent port, fuel lines, and adjustment screws.
Collage of BP42 carburetor angles for Ryobi backpack leaf blowers showing aluminum alloy construction and choke lever.
Replacement primer bulb for Ryobi backpack leaf blower carburetors, featuring durable wear-resistant plastic.
Replacement air filter for Ryobi backpack leaf blowers featuring high-density pleated paper and durable rubber seal.
BP42 carburetor kit for Ryobi backpack leaf blowers including air filter, fuel filter, spark plug, and fuel lines.
BP42 carburetor kit for Ryobi backpack leaf blowers including air filter, fuel filter, spark plug, and fuel lines.
BP42 carburetor replacement for Ryobi backpack leaf blowers with white throttle lever and fuel efficiency graphic.
BP42 carburetor kit for Ryobi leaf blowers including carburetor, air filter, fuel filter, spark plug, bulb, and gaskets.
Dimensional diagram of BP42 carburetor, air filter, and spark plug for Ryobi backpack leaf blowers.
BP42 carburetor for Ryobi backpack leaf blowers shown with compatibility and part number information.
BP42 carburetor diagram for Ryobi backpack leaf blowers showing idle screw, vent port, fuel lines, and adjustment screws.
Collage of BP42 carburetor angles for Ryobi backpack leaf blowers showing aluminum alloy construction and choke lever.
Replacement primer bulb for Ryobi backpack leaf blower carburetors, featuring durable wear-resistant plastic.
Replacement air filter for Ryobi backpack leaf blowers featuring high-density pleated paper and durable rubber seal.
BP42 carburetor kit for Ryobi backpack leaf blowers including air filter, fuel filter, spark plug, and fuel lines.
Lifetime Warranty

[Lifetime Warranty] BP42 Carburetor - Compatible with Ryobi RY08420 RY08420A RY42WB RY42BPEMC Backpack Leaf Blower - Replaces 308054093 308054079 WT-1086 Carb with Air Filter Fuel Filter Spark Plug Primer Bulb

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308054093 / 308054079 / WT-1086 Carburetor with Air Filter Fuel Filter Spark Plug Primer Bulb

Key Features

  • Complete engine tune-up and fuel system overhaul kit
  • Direct replacement for specified models to restore original performance
  • Kit includes: 1x carburetor, 1x air filter, 1x fuel filter, 1x spark plug, 1x primer bulb, 2x gaskets, 2x fuel lines
  • Pre-adjusted carburetor for most applications; may require fine-tuning

Replaces / Cross-Reference Part Numbers

  • Carburetor: 308054093, 308054079, WT-1086
  • Air Filter: 900777005

Compatibility & Fitment

  • Brand: Ryobi
  • Equipment Type: Backpack Leaf Blower, Wheeled Leaf Blower
  • Models:
    • BP42
    • RY08420
    • RY08420A
    • RY42WB
    • RY42BPEMC

When to Replace

  • Engine fails to start or experiences hard starting
  • Rough idling, stalling, or hesitation during acceleration
  • Noticeable loss of engine power
  • Black smoke emitting from the exhaust
  • Fuel leaking from the carburetor body

Installation Tips

  • Consult your equipment's service manual for detailed instructions.
  • Before disassembly, take photos of fuel line connections and throttle linkage for reference.
  • Ensure mounting surfaces are clean and free of old gasket material before installing the new carburetor.
  • Replace the air filter and fuel filter simultaneously with the carburetor for best results.
  • After installation, check for fuel leaks and perform fine-tuning adjustments to the idle and mixture screws if necessary.

FAQ

This carburetor is commonly matched to Ryobi BP42 42cc backpack blower models including RY08420, RY08420A, RY42WB, and RY42BPEMC. Match your model number from the blower label and compare the carburetor part numbers before ordering.
Referenced replacement numbers for this carburetor include 308054093, 308054079, 900777005, WT-1086, and 530069247. The air filter in kit listings is also commonly referenced as 900777005. Always verify the number on your original carburetor or parts diagram.
Typical symptoms include hard starting, only running with the choke partly on, stalling at idle, bogging under throttle, surging, poor fuel delivery to the primer bulb, and loss of blowing power. On these 2-cycle backpack blowers, carburetor problems are often caused by stale fuel, varnish buildup, or a stiff internal diaphragm.
For most users, this is a moderate small-engine repair that takes about 20 to 45 minutes. Typical tools include a screwdriver, nut driver or socket set, needle-nose pliers, and possibly a carburetor adjustment tool depending on the version. Before removal, take a photo of the throttle linkage, fuel line routing, and gasket order so reassembly is easier.
Yes. It is smart to inspect or replace the air filter, fuel filter, primer bulb, spark plug, fuel lines, and intake gaskets at the same time—especially if the blower has been sitting with old fuel. A restricted fuel filter or cracked fuel line can cause the same symptoms as a bad carburetor and may prevent a new carb from performing correctly.
The most common causes are old ethanol-blended fuel, fuel left in storage over the off-season, dirt entering through a worn air filter, and hardened diaphragms from age. These conditions can clog metering passages or prevent the carburetor from pumping fuel properly, leading to lean running, poor starting, or stalling.
After the fuel lines are connected correctly, pressing the primer bulb several times should pull fuel through the carburetor and send excess fuel back through the return line. If the bulb stays empty, check for reversed fuel lines, a leaking primer bulb, a clogged fuel filter, or an air leak at the carburetor gaskets.