Piaggio 286716 Flywheel Roller Housing Assembly – Vespa PK 125 Automatic (1983-1984)

The Piaggio 286716 is the roller housing – flywheel assembly for the Vespa PK 125 S Automatica, the first Vespa with an automatic transmission, produced in 1983-1984. It is the body that houses the variator rollers, integrated with the flywheel, cooling fan, and starter ring gear. A new original Piaggio spare part, now out of production. Part number 286716, replaced in the catalog by 2867165.

✓ Strengths

• Complete assembly, not a half-shell – roller housing and flywheel pre-assembled, as it comes from the factory
• With fan and ring gear – the configuration with electric start, the most difficult to source
• Original Piaggio, never installed – not a refurbished recovery unit
• Hard-to-find spare part – the PK 125 Automatica was built in just over 10,000 units over two years: its specific parts are almost impossible to find anymore
• Restores original shifting – with intact roller seats, the variator returns to shifting up and down smoothly

Technical features

Vehicle compatibility

This code does not appear in the Piaggio online catalog, which does not cover pre-1998 models. Model names, frame prefixes, and years are taken from SIP-Scootershop, Racing Planet, and historical Vespa archives. If you are unsure about your version, write to us and we will verify it together.

Perfect for

This is the part sought after by anyone getting a PK 125 Automatica back on the road and finding that the variator won't shift up, jerks at start, or makes noise: wear grooves form on the roller seats, and the plastic fan cracks after forty years. Finding a new, original, and complete one is rare: on a Vespa built in little more than ten thousand units, it is precisely the specific automatic parts that stall restoration projects.

Frequently Asked Questions

What exactly is the "roller housing"?
It is the body that houses the variator rollers: it is the rollers, by pushing outward with engine speed, that vary the automatic transmission ratio. On the PK Automatica, this body is integrated with the flywheel and fan, so the assembly functions as both a variator and a flywheel.

Which Vespa does the 286716 fit?
The Vespa PK 125 S Automatica, produced in 1983-1984 with frame prefix VAM1T and, for the electric start version, VVM1T. It is not interchangeable with manual PK 125s, which have a completely different transmission.

Is the stator included?
The official Piaggio designation mentions only the roller housing and the flywheel, but the item photo also shows the 6-coil stator with wiring. To avoid any surprises, contact us for more information before purchasing: we will confirm with photos exactly what the package we ship contains.

How do I know if the assembly needs replacing?
Typical symptoms are the variator failing to shift up, jerking at start, metallic noise from the flywheel side, and decreased top speed. With the unit disassembled, you can see ovalized or grooved roller seats; the plastic fan must also be checked, as it cracks with age and unbalances the flywheel.