JetPrime JP ES 042 Aprilia — SLS/AIS Block-Off Plate — view 1 360° — drag me
02 · Data & docs

The facts.

Technical data
ModelJP ES 042
ManufacturerJetPrime
MaterialCNC-milled Ergal 7075
FitsAprilia RS 457 (2024–2026)
InstallationPlug-and-play, no wiring harness modifications required
FitmentAprilia RS 457 (2024–2026)
Road approvalNone — 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)
07 · Support

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08 · Paddock

Before you go.

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