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Piaggio Genuine Vespa ET4 125 Carburetor Diaphragm Vacuum Membrane 478560
Piaggio Genuine Vespa ET4 125 Carburetor Diaphragm Vacuum Membrane 478560
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Product Description
Piaggio Genuine factory carburetor vacuum diaphragm membrane (MEMBRANA CARBURATORE). Molded from fuel-resistant NBR synthetic elastomer, this flexible 22mm vacuum slide membrane controls throttle slide elevation via engine intake vacuum on early generation (pre-LEADER) 125cc 4-stroke engines equipped with Walbro / Keihin CV carburetors.
Vehicle Compatibility
Standard Genuine replacement fitment for first-generation (pre-LEADER 1996–2000) Piaggio 125cc 4-stroke air-cooled engines:
| Make | Model | Chassis / Engine Variant | Model Years |
| Vespa | ET4 125 | ZAPM04000 / 125cc 4T (Pre-LEADER) | 1996–1999 |
| Piaggio | Liberty 125 | ZAPM11000 / 125cc 4T (Pre-LEADER) | 1998–2000 |
| Piaggio | Sfera 125 / Sfera RST 125 | ZAPM01000 / 125cc 4T | 1995–1998 |
| Piaggio | Hexagon LX4 125 | ZAPM15000 / 125cc 4T | 1998–2000 |
| Aprilia | Mojito 125 / Custom | RY000 / 125cc 4T (Piaggio Engine) | 1999–2001 |
Fitment & Technical Details
Seats inside the upper vacuum chamber cap of the 22mm CV carburetor. Note: Fits pre-LEADER generation 125cc 4T engines only; does not fit 2000+ LEADER engine carburetors. Ensure the lip seats completely flush in the perimeter groove without pinching during installation.
Important: Please ensure the part number matches your motorbike before purchasing. If you have any questions about the part or its compatibility, feel free to contact us. We’re here to help!
At Dmmotorcycles, we’ve specialized in vintage and vintage sports motorcycles and parts directly from Japan since 1998. We stock a wide selection of rare genuine and high-quality aftermarket parts and continually update our inventory to meet growing demand.
Looking for a specific part? Don’t hesitate to ask! We may have it in stock even if it’s not listed online. If not, we’ll do our best to source it for you.
We’re also happy to provide guidance on installation and offer excellent after-sales support to ensure your satisfaction.
Shipping Information
We ship worldwide, carefully inspecting and securely packing all parts to ensure safe delivery. Your order will be insured and shipped quickly, with the best available shipping option chosen for speed and reliability.
Please note:
- All parts are shipped from Cyprus (Europe).
- Customers outside the EU may incur additional import taxes based on the value of the item.

How we handle your order in 4 steps
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1. Order Verification
We confirm the order and make sure the correct part number, quantity, and any special requests match what’s on the sales confirmation
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2. Quality Check
Since our parts are new old stock we Inspect the parts for any defects, scratches, or missing components to ensure it meets quality standards. otherwise will notify you before proceeding with the order.
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3. Safe and Secure packaging
- Protective Wrapping: We use bubble wrap or foam padding to wrap the part, focusing on sharp edges or delicate components.
- Boxing: We place the wrapped part inside a sturdy box, filling gaps with packing materials to prevent movement.
- Sealing and Labeling: Securely tape the box and attach the shipping label, including orientation-specific markers like "Fragile."
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4. Finalizing of Shipment
We confirm the shipping address and contact details, give the package to the Post, keep the tracking number, and then send it to the customer along with the shipment notification.