Honda 16221-ZB7-800 Carburetor Gasket

The Honda 16221-ZB7-800 Carburetor Gasket is a genuine OEM replacement designed for EX3300 and EX4500 generators, the EXW171 welder generator, and GX340 horizontal shaft engines. As a direct OEM replacement, this gasket is manufactured to Honda's exact specifications, ensuring a proper seal between the carburetor and intake surfaces. Confirm your unit's serial number against the fitment table before ordering, as Honda updates part numbers at specific serial breaks and more than one version may exist for a given model.

Key Features

• OEM Sealing Integrity — manufactured to Honda's exact dimensions and material grade, delivering the clamping retention and fuel-vapor seal this carburetor joint demands
• Direct OEM Replacement — engineered to drop into place where the original gasket sits, with no trimming or modification needed to achieve a proper seat
• Broad Honda Fitment — covers EX3300 and EX4500 generators, the EXW171 welder generator, and GX340 horizontal shaft engines; use part number 16221-ZB7-800 to verify this is the correct gasket for your unit
• Serial Number Verification — Honda supersedes gasket part numbers at production breaks, so always cross-check your machine's serial number against the compatibility table to confirm the right fit
• Leak-Free Fuel Delivery — a compromised or deteriorated carburetor gasket allows air and fuel vapor to escape the joint, causing rough running, hard starting, and inconsistent output; replacing it restores the sealed system the carburetor depends on

The carburetor gasket forms an airtight, fuel-tight seal between the carburetor body and the engine's intake port or mounting flange. This seal keeps the fuel-air mixture at the correct ratio by preventing unmetered air from entering and stopping fuel vapor from escaping at the joint. When the gasket deteriorates — through heat cycling, age, or compression loss — the engine may run lean, idle erratically, or refuse to start cleanly, and in some cases fuel can seep from the joint entirely. Replacing a worn carburetor gasket is a straightforward service step that restores the tight seal the carburetor needs to meter fuel accurately and keep the engine running at full efficiency.

Part Details

Compatibility & Fitment

Verify Before You Order

Fitment is machine-number and revision-specific; always confirm your model and serial number against the fitment list.

Why Buy From DHS Equipment

Every part is verified against the manufacturer's part number before it ships, so what you order is what arrives. We carry parts from leading OEM brands and our own DHS Quality Parts line of professional aftermarket components. Need help finding the right part? Our team is available to confirm compatibility whenever you need it. Orders are processed fast to keep your jobs on track. We don't just sell parts. We keep you jobsite ready.

Questions? Contact our team at [email protected] or 866-611-9369 — DHS Equipment is here to help you maintain peak performance.