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

The complete thermostat cover is the housing that encloses the thermostat seat on the cylinder head and features the water hose connection and the pre-mounted air bleed screw. This is an original Piaggio spare part made of black technopolymer with metal fixing bushes, for liquid-cooled engines from 125 to 350 cc by Piaggio, Aprilia, Gilera, and Vespa. Product code B018147.

✓ Strengths

• Original Piaggio spare part – the same code indicated in the official spare parts catalogue at position 15 of table 01.10 "Head - Valves Group", Engine group.
• Comes complete – cover, bleed screw with cap, and metal bushes already in place: no need to retrieve anything from the old part.
• This is where the circuit leaks first – over the years, the technopolymer around the connection cracks, and water leaks right there, under the hose clamp.
• One 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.
• Can be changed in minutes – two M5 screws, the hose, and the o-ring gasket: it's one of the quickest procedures in the cooling circuit.

Technical specifications

Vehicle compatibility

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

Who is it perfect for?

This is the part for those experiencing coolant loss on the cylinder head side, a seemingly unexplained drop in the expansion tank level, and a light crust of dry antifreeze around the hose. On liquid-cooled Piaggio Group engines – Beverly, MP3, Vespa GTS and GTV, Nexus, Atlantic, Sport City – the thermostat cover is one of the first points to fail: the technopolymer ages, the connection cracks under the clamp, and the circuit leaks when hot. It's also a part that workshops keep in stock because a single code covers virtually the entire liquid-cooled range from 125 to 350 cc, and it costs a fraction of the labor needed to locate the leak.

Frequently asked questions

Which vehicles does it fit?
On all liquid-cooled engines from 125 to 350 cc of 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 comes with the bleed screw, cap, and fixing bushes already mounted. The actual thermostat is a separate code, 82831R, which is at position 20 on the same table in the catalogue. If the engine doesn't reach operating temperature, that's the part to change.

Where exactly is it located on the vehicle?
On the cylinder head, on the cooling circuit side: it's the black part with the connection where the water hose is attached and with the bleed screw at the top. In the official catalogue, it is in the Engine group, on table 01.10 "Head - Valves Group", at position 15, in quantity 1 per vehicle.

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

Is it plastic or aluminum?
The original Piaggio part is made of black technopolymer, with metal bushes in the fixing holes and a brass bleed screw. Aftermarket reproductions machined from solid aluminum are available on the market: these are different, with a different price and without the manufacturer's warranty.

How can I be sure it's the right one?
The sure way is the frame number: send it to us, and we will verify the code in your vehicle's official catalogue. Alternatively, compare the disassembled part with the photos: a single connection for the hose, a bleed screw with a cap at the top, and two fixing holes with metal bushes are the signature of B018147.