⟲ 360° — drag meThe facts.
| Model | JP ES 042 |
|---|---|
| Manufacturer | JetPrime |
| Material | CNC-milled Ergal 7075 |
| Fits | Aprilia RS 457 (2024–2026) |
| Installation | Plug-and-play, no wiring harness modifications required |
| Fitment | Aprilia RS 457 (2024–2026) |
| Road approval | None — closed-circuit and race use only |
DescriptionThe whole story▼
The JP ES 042 blanks the RS 457's secondary air port with a plate machined from solid aluminium.
Key Features
- Aprilia RS 457 (2024–2026)
- Blanks the secondary air port in the head
- Machined from solid aluminium
- O-ring sealed, no jointing compound
- Original fastener positions
- Standard housing refits at any time
One Port, One Plate
The parallel twin carries a single reed housing on the head, fed by a hose from the airbox. Blanking it is among the quicker jobs on the engine.
Why It Is There At All
Secondary air remains the cheapest route to a Euro certificate on a small engine. It contributes nothing to how the motorcycle runs and never has.
Plastic on a Cylinder Head
The housing lives at head temperature and flexes on every closed throttle. Reeds crack eventually, and a cracked reed sends exhaust gas back towards the airbox.
A Solid Blank
Milled from one piece with an O-ring in a turned groove. Nothing inside it moves, so nothing inside it wears out.
An Aluminium Frame
Almost nothing at this price uses one. Aprilia spent the money where it changes how the motorcycle behaves rather than on the specification sheet.
Forty-Seven Horsepower
From 457 cc, which places the bike inside the A2 category without an electronic limiter. It is a real motorcycle rather than a restricted one.
Original Fastener Positions
Aprilia's own bolt spacing and torque figures. Nothing is drilled and no thread in the head is cut or disturbed.
Not the Electrical Half
The controller still monitors the solenoid whatever is bolted to the head. That circuit needs its own eliminator.
Homologation
Secondary air is part of the bike's approval and removing it ends road legality across Europe.
Reversible
The standard housing refits on its own fasteners with no replacement seals required.
A Five-Inch Colour Display
Aprilia gave the 457 a full TFT with phone connectivity, which almost nothing at this price offers. It is legible in direct sunlight, which is the only test that actually matters, and it does not need a manual to configure.
Fitment and Compatibility
- Aprilia RS 457 (2024–2026)
Specifications
| Model | JP ES 042 |
|---|---|
| Manufacturer | JetPrime |
| Material | CNC-milled Ergal 7075 |
| Fits | Aprilia RS 457 (2024–2026) |
| Installation | Plug-and-play, no wiring harness modifications required |
What's includedEverything in the box▼
- 1x block-off plate
FitmentWhich bikes this fits▼
- Aprilia RS 457 (2024–2026)
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Our team is happy to help. Use the contact button below and we’ll personally help you choose the right gear or part.
Measure your head circumference about one centimetre above your eyebrows and compare it with the size chart on this page. Between sizes? Choose the smaller one — the padding beds in with use.
Yes — it’s tested and approved to the current ECE 22.06 standard and road-legal across the EU.
Most of our touring and sport helmets are Pinlock-ready and many include the insert. Check the ‘What’s in the box’ section on this page for this model.
Yes — the cheek pads are channelled so the arms of your glasses slide in comfortably.
Take out the washable lining and hand-wash it in lukewarm water. Clean the shell and visor with a soft cloth and water only — never solvents.
Our team will personally help you choose the right gear or part — around 24h for a reply.