Honda 16013-ZDD-R02 Metering Diaphragm Assembly

The Honda 16013-ZDD-R02 Metering Diaphragm Assembly is a genuine OEM component designed for GXR120 horizontal shaft engines. As an authentic Honda part, it meets the same specifications as the original, ensuring the carburetor's fuel metering circuit operates exactly as intended. If your GXR120 engine is running rough, surging, or refusing to start, a worn or ruptured metering diaphragm is a common culprit — and this assembly is the direct OEM solution. Always verify part number 16013-ZDD-R02 against your engine's serial number using the fitment table before ordering.

Key Features

• Precise Fuel Metering — manufactured to OEM specification, this diaphragm controls the fuel flow within the carburetor with the same flexibility and dimensional accuracy as the original, preventing rich or lean conditions that cause rough running and hard starts
• Genuine Honda OEM Part — sourced directly from Honda, part number 16013-ZDD-R02 is an exact replacement for the original assembly, with no adaptation needed to reinstall
• GXR120 Fitment — built specifically for GXR120 horizontal shaft engines; confirm your engine's serial number against the fitment table, as Honda supersedes parts at serial breaks
• Restores Engine Response — a deteriorated metering diaphragm disrupts the vacuum-driven fuel circuit, leading to lean stumbles, surging, and stalling; replacing it brings throttle response and idle quality back to spec

The metering diaphragm is a critical flexible membrane inside the carburetor's metering chamber. It responds to engine vacuum to regulate the precise amount of fuel delivered to the fuel circuit, keeping the air-fuel mixture consistent across the engine's operating range. When the diaphragm cracks, stiffens, or develops pinholes with age — accelerated by ethanol-blended fuels — it can no longer hold or respond to vacuum correctly, causing the engine to run lean, surge at part throttle, idle erratically, or fail to start altogether. Replacing this assembly restores proper fuel metering and returns the engine to smooth, consistent operation.

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.