Piaggio 825364 Cylinder Head Cover Gasket – Vespa LX, S, LXV, Liberty and Fly 125-200

The cylinder head cover gasket — officially listed in the catalog as the head cover gasket — is a shaped rubber ring that keeps oil inside the cylinder head. It runs along the entire edge of the rocker cover and seals it against the cylinder head. This is an original Piaggio spare part for air-cooled Leader 125, 150, and 200 4T single-cylinder engines. Product code 825364.

✓ Strengths

• Original Piaggio spare part – the same code that the official spare parts catalog indicates at position 7 of the Cylinder Head Cover, Engine Group diagram.
• Shaped profile, not a round ring – follows the irregular contour of the cover and has two reference points that hold it in place during assembly.
• This is the part that stops oil leakage from the cylinder head – the classic drip onto the cylinder and manifold that dirties the engine and causes a burning smell.
• One code for dozens of models – the entire Leader 125-200 family: Vespa, Piaggio, and Aprilia.
• It should be replaced every time the cover is opened – including valve adjustments: it costs very little, and reusing an old one is the most common reason for leakage to reappear.

Technical specifications

Vehicle compatibility

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

Who is it perfect for?

It's the part for anyone who finds oil dripping onto the cylinder, the engine always greasy on the right side, and that burning smell when oil gets on the exhaust manifold. On Leader 125-200 engines, the rocker cover gasket is the first point that fails with age, and it's discovered during the first valve adjustment. It's also a part that workshops keep in stock: a single code covers practically the entire family — Vespa LX, S, LXV, and ET4, Liberty, Fly, Skipper, Zip 4T, Typhoon, X8, and Aprilia models with the Piaggio engine — and it costs a fraction of the labor required to remove the cover.

Frequently Asked Questions

Is it the cylinder head gasket?
No, and this is the most common confusion regarding this code. The 825364 seals the rocker cover against the cylinder head: it's the one that stops oil from leaking outwards. The gasket between the cylinder and the head, which provides compression, is a completely different code. If you have any doubts, send us the VIN.

Which vehicles does it fit?
It fits the entire family of air-cooled Leader 125, 150, and 200 4T single-cylinder engines: Vespa LX, S, LXV, and ET4, Piaggio Liberty, Fly, Skipper, Zip 125 4T, Typhoon 125, and X8, plus Aprilia Mojito, Sport City ONE, and SR Motard 125 which use the same engine. Exact versions and years are in the table above.

Where exactly is it located on the vehicle?
Under the rocker cover, at the top of the cylinder head: it's visible as soon as the cover is removed, which on Leader engines is secured by four M6x20 screws. In the official catalog, it's in the Engine group, on the Cylinder Head Cover diagram, at position 7, with a quantity of 1 per vehicle.

Do I absolutely have to replace it if I open the cover?
Yes, it's always advisable. The rubber gasket is compressed between two surfaces, and once compressed, it does not regain its thickness: reusing it is the most frequent reason for oil leakage to reappear after just a few weeks. It's inexpensive and quick to replace while the cover is already removed.

I see two gaskets on the diagram: which one is this?
This is position 7, the gasket for the perimeter of the cylinder head cover. 487989 at position 6 and O-ring 829817 at position 3 belong to the oil breather cover, which is a different part bolted on top. These are all distinct codes.

Do I need sealant?
No, if the surfaces are clean: the gasket works by itself, as designed by the manufacturer. Before reassembling, oil residues must be removed from the head surface and the cover, and the four screws must be re-tightened in a cross pattern and without overtightening: the cover is made of light alloy.