Honda Wyl133A Metering Diaphragm - OEM Number: 16013-Zm3-004

The Honda WYL133A Metering Diaphragm (OEM 16013-ZM3-004) is a genuine replacement carburettor component designed for use on selected Honda small engines and handheld power equipment. The metering diaphragm controls fuel delivery within the carburettor, helping to maintain the correct fuel-to-air mixture for reliable starting, smooth running, and consistent engine performance.

Manufactured to OEM specifications from fuel-resistant diaphragm material, the metering diaphragm is engineered to withstand continuous exposure to fuel, vibration, and the demanding conditions encountered in outdoor power equipment applications. Precision-manufactured for an accurate fit, it is designed as a direct replacement component to restore correct carburettor operation and fuel metering performance.

FUNCTION AND OPERATION

• Regulates fuel flow within the carburettor metering system
• Maintains the correct fuel-to-air mixture for engine operation
• Supports reliable starting and smooth engine running
• Helps maintain consistent throttle response
• Resists fuel exposure and repeated engine vibration
• Designed for small engine and handheld equipment applications

TECHNICAL DETAILS

• OEM Part Number: 16013-ZM3-004
• Type: Metering diaphragm
• Function: Carburettor fuel metering control
• Application: Honda WYL133A carburettor systems and selected Honda small engines
• Material: Fuel-resistant flexible diaphragm material
• Design: OEM direct replacement component

TYPICAL APPLICATIONS

Suitable for selected Honda equipment, including:

• GX22 engines
• GX31 engines
• Brushcutters
• Hedge trimmers
• Compact handheld power equipment
• Other Honda machines fitted with the compatible carburettor assembly

Always verify compatibility using the engine model, carburettor specification, and OEM part number before ordering, as metering diaphragms can vary in shape, thickness, and application between carburettor models.

IMPORTANT INFORMATION

Always confirm the correct OEM part number, engine model, and carburettor specification before ordering, as metering diaphragms are manufactured to precise dimensions and operating requirements. Installing the correct component is essential to maintain accurate fuel delivery, reliable engine performance, and efficient operation.

Common signs that a metering diaphragm requires replacement include difficult starting, poor acceleration, inconsistent running, fuel delivery issues, engine hesitation, or a noticeable reduction in performance. When replacing the metering diaphragm, it is recommended to inspect the carburettor gasket, fuel passages, primer system, and surrounding components for signs of wear, contamination, or damage. Replacing any worn associated components at the same time will help maximise the reliability and service life of the complete fuel system.

DELIVERY OPTIONS (UK mainland only)

Next Day Delivery*
£11.95 or FREE for orders over £150
Orders placed before 4pm Monday to Friday will be delivered on the next business day.
Orders placed after 4pm on Friday will be delivered the following Tuesday.
*Next day delivery applies to stocked items only. Availability can be found on the product pages.

Premium Delivery*
£30.00 for delivery before 10:30am
£25.00 for delivery before 12:30pm
*Premium delivery applies to stocked items only. Availability can be found on the product pages.

For all other countries, please click here for full delivery information.

**Separate carriage charges apply to bulk products such as 205L barrels.