Genuine Aprilia RS 125 RX SX 125 Tuono 125 2017-2024 Cylinder Head Gasket | OEM 1A007851
$40.00
$46.00
-13%
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Genuine Aprilia RS 125 RX SX 125 Tuono 125 2017-2024 Cylinder Head Gasket | OEM 1A007851
$40.00
$46.00
-13%
Taxes included.
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Code: 1A007851
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Shipping notice: truck drivers' strike in Italy
Updated 19/10/2026
Since 16 October, truck drivers protesting against high diesel prices have been blocking roads and ports in Southern Italy (Campania, Calabria, Sicily, Puglia, Basilicata), and the protest could spread to the rest of the country. The strike affects all our shipments, in Italy and abroad: Poste Italiane is currently not collecting parcels, while BRT and DHL are collecting as usual but deliveries may be delayed in some areas.
- Italy we ship with BRT and DHL · possible delivery delays
- European Union for now we ship with DHL only · possible delays
- Non-EU countries (customs) shipments temporarily suspended: they will leave as soon as Poste Italiane resumes collections
We apologise for any inconvenience and thank you for your patience.
Shipping outside the European Union — duties payable by the recipient
This order ships outside the European Union and is subject to customs clearance in the destination country.
Export formalities and costs from Italy are on us and are already included in the price.
Import duties, taxes and clearance fees in the destination country are payable by the buyer. They are not included in the product price or the shipping cost, and we cannot calculate them: they are set by the customs authority of the destination country.
The carrier will not release the parcel until the recipient pays these charges. If the shipment is refused or the charges are left unpaid, the parcel is returned to us and shipping, return and any customs costs are deducted from the refund.
This order ships outside the European Union and is subject to customs clearance in the destination country.
Export formalities and costs from Italy are on us and are already included in the price.
Import duties, taxes and clearance fees in the destination country are payable by the buyer. They are not included in the product price or the shipping cost, and we cannot calculate them: they are set by the customs authority of the destination country.
The carrier will not release the parcel until the recipient pays these charges. If the shipment is refused or the charges are left unpaid, the parcel is returned to us and shipping, return and any customs costs are deducted from the refund.
The Aprilia 1A007851 cylinder head gasket is the original OEM Piaggio Group spare part for the 125 4T 4V M545M single-cylinder engine fitted on Aprilia RS 125, RS 125 Replica/GP Replica, RX 125, SX 125, and Tuono 125 from 2017 to 2024, in both Euro 4 and Euro 5 versions. It is the gasket that seals the mating surface between the cylinder head and the cylinder, ensuring a perfect seal for the combustion chamber and the oil and coolant circuits.
✓ Strengths
- 100% original Aprilia / Piaggio spare part – same component fitted at the factory
- OEM code 1A007851 – perfect interchangeability and zero fitment risks
- Broad compatibility – RS 125, RS 125 Replica, RX 125, SX 125, Tuono 125 (E4 / E5) from 2017 to 2024
- Reference engine: 125 cc 4T 4V single-cylinder M545M
- Guaranteed seal between head and cylinder for combustion gases, oil, and coolant
- Mandatory replacement component every time the cylinder head is removed
Technical specifications
| Brand | Aprilia (Piaggio Group) |
| OEM code | 1A007851 |
| Equivalent code | AP3CLA000637 |
| Type | Cylinder head gasket |
| Reference engine | Piaggio / Aprilia 125 4T 4V M545M |
| Displacement | 125 cc |
| Cooling | Liquid |
| Spare part type | Original Aprilia (OEM) |
| Quantity per engine | 1 piece |
⚠️ Important notes:
• The cylinder head gasket is a single-use component: it must always be replaced with a new one every time the cylinder head is removed.
• For reassembly, it is mandatory to follow the diagram and torque settings indicated in the Aprilia workshop manual, using new or verified head bolts.
• It is recommended to simultaneously replace the cylinder base gasket, head O-ring, valve stem seals, and coolant.
• The procedure must be carried out by a qualified mechanic: incorrect tightening can cause leaks, overheating, and engine damage.
• Verify the engine code and model using the VIN before purchasing.
• The cylinder head gasket is a single-use component: it must always be replaced with a new one every time the cylinder head is removed.
• For reassembly, it is mandatory to follow the diagram and torque settings indicated in the Aprilia workshop manual, using new or verified head bolts.
• It is recommended to simultaneously replace the cylinder base gasket, head O-ring, valve stem seals, and coolant.
• The procedure must be carried out by a qualified mechanic: incorrect tightening can cause leaks, overheating, and engine damage.
• Verify the engine code and model using the VIN before purchasing.
Vehicle compatibility
| Family | Model / Version | Years |
|---|---|---|
| RS 125 | RS 125 4T E4 ABS (EMEA) | 2017 – 2018 |
| RS 125 Replica 4T E4 ABS (EMEA / APAC) | 2017 – 2019 | |
| RS 125 4T E5 ABS (EMEA) | 2021 – 2023 | |
| RS 125 GP Replica 4T E5 ABS (EMEA / APAC) | 2021 – 2023 | |
| RX 125 | RX 125 E4 (EMEA / APAC) | 2018 – 2020 |
| RX 125 E5 (EMEA / APAC) | 2021 – 2024 | |
| SX 125 | SX 125 E4 (EMEA / APAC) | 2018 – 2020 |
| SX 125 E5 (EMEA / APAC) | 2021 – 2024 | |
| Tuono 125 | Tuono 125 4T E4 ABS (EMEA / APAC) | 2017 – 2020 |
| Tuono 125 4T E5 ABS (EMEA) | 2021 – 2024 |
Recommended related spare parts
- OEM cylinder base gasket – to be replaced along with the head gasket
- Valve stem seals and tappets / shims – to be checked with the head removed
- Cylinder head bolts – check condition and elongation, replace if out of tolerance
- OEM cylinder piston kit – recommended for high-mileage engines
- Specific Piaggio coolant – to be refilled after the procedure
- Eni i-Ride Moto engine oil specific for Aprilia – to be replaced after any engine opening
Who it's perfect for
This gasket is designed for authorized workshops, specialized Aprilia/Piaggio mechanics, and enthusiasts who need to work on the cylinder head of a 125 4V from the Aprilia range (RS, RX, SX, Tuono). It is the mandatory choice for those who want to perform a perfectly executed engine service, replace the gasket in case of leakage/overheating, or complete a full engine overhaul with original and traceable spare parts.
🛡️ Guarantee and quality – Moon Bike S.r.l.
Moon Bike S.r.l. is an official Piaggio Group dealer (Piaggio, Vespa, Aprilia, Gilera, Moto Guzzi) based in Cercola (NA). The 1A007851 cylinder head gasket is supplied as original Aprilia, with full OEM traceability and covered by the manufacturer's official warranty. We ship throughout Italy and abroad with professional packaging for delicate engine parts.
Moon Bike S.r.l. is an official Piaggio Group dealer (Piaggio, Vespa, Aprilia, Gilera, Moto Guzzi) based in Cercola (NA). The 1A007851 cylinder head gasket is supplied as original Aprilia, with full OEM traceability and covered by the manufacturer's official warranty. We ship throughout Italy and abroad with professional packaging for delicate engine parts.
Compatible vehicles
- Aprilia RS 125 4T E4 (2017-2020)
- Aprilia RS 125 4T E5 (2021-2024)
- Aprilia RX 125 4T (2018-2020)
- Aprilia SX 125 (2018-2020)
- Aprilia Tuono 125 4T E4 (2017-2020)
- Aprilia Tuono 125 4T E5 (2021-2024)
Not sure it fits? Contact us
Frequently asked questions
Shipping times +
Shipping within 24-48 working hours in Italy. Tracking via SMS/email. Free pickup at our store in Cercola (NA), ready within 1 hour.
Returns and refunds +
You have 14 days from delivery to return the item without giving a reason. Free returns for faulty items. Full details
Payment methods +
Credit cards (Visa, Mastercard, American Express), PayPal, Apple Pay, Google Pay, Shop Pay, Klarna (pay in 3) and cash on delivery.
Warranty and authenticity +
All products come with a 24-month legal warranty. We are an Official Piaggio Group Dealer: original spare parts are certified with a verifiable OEM code.
Technical support +
Our technical team is available on WhatsApp +39 392 456 1248 Mon-Fri 9:00–13:30 / 14:30–18:00 (Italian time), or by email.