Replacement for part numbers A021001642, A021001641, WLA1 — complete carburetor kit for Echo PB500 series backpack blowers. Key benefits Restores reliable starting and consistent fuel flow by replacing a worn or damaged carburetor and related components. Saves time and cost compared with buying a unit; includes all commonly replaced parts needed for a full carburetor service. Directfit design for straightforward installation — no carburetor adjustment required for compatible models. What's included 1x carburetor 1x air filter 1x spark plug 1x fuel line kit 1x fuel filter 1x fuel line 2x primer bulbs 1x gasket 1x fuel tank grommet Compatibility Designed for Echo PB500 series backpack blowers, including PB500, PB500T, and PB500H. Fits across the original serial number ranges for these models (check your unit's part number or serial range to confirm). Function and performance Complete kit replaces the carburetor and the common wear parts that affect fuel delivery and ignition. Primer bulbs and fuel lines restore correct fuel priming; the fuel filter reduces fuel contamination reaching the carburetor. Direct installation is intended to the blower to factorylike operation without the need for tuning. Practical details Use this kit when the blower exhibits hard starting, poor idle, uneven throttle response, fuel leaks, or when the carburetor or primer bulb is cracked or clogged. Package contains all items required for a standard carburetor service; materials and dimensions match the requirements for PB500 series models. Use cases Residential yard maintenance: a failing carburetor and worn primer bulb to get your PB500 back to reliable performance for leaf and debris cleanup. Professional landscaping: Keep a service kit on hand for quick field repairs to minimize downtime on a job site. Seasonal maintenance: Perform a carburetor service before storage or after winter to prevent fuelrelated starting problems. Installation note Designed for direct replacement; most users can install the kit without carburetor adjustments. Follow Echo service guidelines or consult a qualified technician if unsure. If your Echo PB500, PB500T, or PB500H needs a complete carburetor service, this kit provides the core replacement parts to restore fuel and ignition components to proper working .