Piaggio 829120 Intake Manifold Air Filter - Vespa ET4, LX, and S (1998-2013)

The Piaggio 829120 is the black rubber intake manifold, an original Piaggio spare part for Vespa ET4 50, 125, and 150 Leader, Vespa 50 4T, and for Vespa LX and S 125 and 150. It is the corrugated bellows that carries air from the under-seat compartment to the air filter box, with an elbow fitting on one end and a rectangular opening on the other. Product code 829120.

✓ Strengths

• Original Piaggio spare part – code 829120: bellows length, elbow diameter, and opening shape are standard, it fits without forcing
• One code for two generations – from ET4 and Vespa 50 4T in historical catalogs to LX and S 125/150 from 2009-2013
• New rubber, sealed intake – when the bellows cracks or comes off, the engine draws unfiltered air and dust directly from the compartment
• Restores correct carburetion – a cracked manifold leans the mixture and causes high idle or jerky acceleration
• Replacement without special tools – work is done from the under-seat compartment, without disassembling the engine

Technical specifications

Compatibility

The list is taken from the official Piaggio spare parts catalog (B2B area). If you have any doubts, send us your scooter's chassis number and we will verify the correct code.

Who it's perfect for

It's the replacement part for those who own a 4-stroke Vespa that's a few years old and notice that the idle is no longer steady, acceleration is jerky, or fuel consumption has increased for no reason. The intake bellows works near the engine, hardens with heat, and after ten or fifteen years, it cracks at the folds or slips off the fitting: from there, the engine draws unfiltered air and dirt directly into the carburetor. It's also the part to replace as a precaution during air filter service or on a Vespa put back on the road after years of being idle: it's inexpensive, can be changed from the under-seat compartment, and eliminates one of the most common causes of erratic carburetion.

Frequently Asked Questions

What exactly is this part and where does it get installed?
It is the intake manifold: the rubber bellows that connects the air intake of the under-seat compartment to the air filter box. It has a corrugated section that absorbs vibrations, an elbow fitting that attaches to the filter box, and a rectangular opening on the air intake side.

Does it also fit the Vespa ET2?
No. The official Piaggio catalog assigns the 829120 only to 4-stroke Vespas: ET4 50, 125, and 150 Leader, Vespa 50 4T, LX, and S 125 and 150. The ET2 is a 2-stroke with a different filter box and ducts and is not listed among the assignments for this code.

How do I know if it needs to be replaced?
Remove the seat and inspect the bellows against the light, bending it: if you see cracks on the folds, if it's hardened and doesn't return to shape, or if it has slipped off the fitting, it's worn out. Typical effects include unstable idle, jerky acceleration, and dust inside the filter box.

What does the package include?
Only one new intake manifold, which the catalog specifies as quantity 1 per vehicle. Clamps, intake hose, and air filter are not included: these are separate codes and must be ordered separately if they also need replacement.

Which Vespas does it fit?
It fits Vespa ET4 50, ET4 125 Leader, and ET4 150 Leader, the Vespa 50 4T from historical catalogs, and the Vespa LX 125 and 150 and Vespa S 125 and 150 from 2009-2013. The exact years and versions for each model are in the compatibility table above.

Is it an original Piaggio part or an equivalent?
It is an original Piaggio spare part, new, with production code 829120. It is not an aftermarket copy: the compound, bellows length, and fitting shapes are standard, ensuring a proper seal on the intake from the first installation.