Piaggio B018147 Complete Thermostat Cover – Beverly, MP3, Nexus and Vespa GTS 125-350

The complete thermostat cover is the housing that seals the thermostat seat on the cylinder head and features the connection for the water hose and the pre-installed air bleed screw. Original Piaggio spare part in black technopolymer with metal fixing bushings, for 125 to 350 cc liquid-cooled engines from Piaggio, Aprilia, Gilera, and Vespa. Product code B018147.

✓ Strengths

• Original Piaggio spare part – the same code indicated in the official parts catalog at position 15 of the 01.10 "Cylinder head - Valves" diagram, Engine group.
• Comes complete – cover, bleed screw with cap, and metal bushings already in place: no need to reuse anything from the old part.
• The most common point of leakage in the circuit – over the years, the technopolymer around the connection cracks, causing water to leak right there, under the hose clamp.
• A single code for almost the entire liquid-cooled range – Beverly, MP3, Carnaby, X7, X8, X9, X10, and X Evo, Vespa GTS, GTV, and GT, Gilera Nexus, Aprilia Atlantic, Sport City, SR Max, and Scarabeo.
• Replaces in a few minutes – two M5 screws, the hose, and the O-ring gasket: it is one of the fastest maintenance tasks in the cooling system.

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 chassis number, and we will verify the correct code.

Who is it perfect for?

It is the part for those experiencing a coolant leak on the cylinder head side, a header tank level dropping for no apparent reason, and a light crust of dried antifreeze around the hose. On Piaggio Group liquid-cooled engines — Beverly, MP3, Vespa GTS and GTV, Nexus, Atlantic, Sport City — the thermostat cover is one of the first components to fail: the technopolymer ages, the connection cracks under the clamp, and the circuit leaks when hot. It is also the spare part that workshops keep in stock because a single code covers practically the entire liquid-cooled range from 125 to 350 cc and costs a fraction of the labor required to locate the leak.

Frequently Asked Questions

What vehicles does it fit?
It fits all liquid-cooled 125 to 350 cc engines from the group: Piaggio Beverly, BV, MP3, Carnaby, X7, X8, X9, X10, and X Evo, Vespa GTS, GTV, and 60° GT, Gilera Nexus, Aprilia Atlantic, Sport City, Sport City Cube and Street, SR Max 300, and Scarabeo. Exact versions and years are in the table above.

Is the thermostat included?
No. "Complete" refers to the cover, which arrives already with the bleed screw, cap, and fixing bushings installed. The actual thermostat is a separate code, 82831R, which in the catalog is at position 20 of the same diagram. If the engine is not reaching operating temperature, that is the part to replace.

Where is it exactly located on the vehicle?
On the cylinder head, on the cooling circuit side: it is the black piece with the connection for the water hose and the bleed screw on top. In the official catalog, it is in the Engine group, on diagram 01.10 "Cylinder head - Valves", at position 15, in a quantity of 1 per vehicle.

Are there equivalent codes?
In the official catalog, at the same position of the same diagram, the code B013477 also appears: the two codes are indicated as paired. You may find references to 876943 and 845604, but these are not confirmed by the diagram: if you have one of these, send us your chassis number and we will tell you the correct code for your vehicle.

Is it plastic or aluminum?
The original Piaggio is in black technopolymer, with metal bushings in the fixing holes and a brass bleed screw. There are third-party reproductions on the market machined from solid aluminum: these are a different product at a different price and are not the manufacturer's part.

How do I make sure it's the right one?
The sure way is the chassis number: send it to us and we will check the code against your vehicle's official catalog. Alternatively, compare the removed part with the photos: a single connection for the hose, a bleed screw with a cap on top, and two fixing holes with metal bushings are the signature features of the B018147.