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

The facts.

Technical data
BrandJetPrime
Part numberJP ES 042
FunctionCNC-machined cover plate
TypeSLS/AIS Block-Off Plate
InstallationPlug-and-play, no modification to the original wiring
FitmentAprilia RS 457 (2024–2026)
Road approvalNone — closed-circuit and race use only
DescriptionThe whole story

Deleting the PAIR system leaves two open ports on the cylinder head where the reed valves used to sit. They cannot stay open. The JP ES 042 is the CNC-machined aluminium plate that closes them on the RS 457 — a small part that turns a half-finished job into a finished one.

Key Features

  • CNC-machined aluminium cover plate for the Aprilia RS 457
  • Replaces the original PAIR system cover
  • Seals the port permanently once the reed valve is removed
  • Machined from solid, not cast or pressed
  • Uses the original mounting bolts and gasket location
  • Purely mechanical — no electrical connection

Mechanical Half, Electrical Half

A complete PAIR delete has two sides. This plate is the mechanical half: it closes the head. The electrical half is the solenoid eliminator that keeps the ECU from reporting the missing valve. Fitting the plate alone will seal the engine but leave a fault on the dashboard; fitting the eliminator alone leaves an open port. Most owners do both, and JetPrime sells them together as a kit under a separate part number.

Why Machined Rather Than Cast

The plate sits against a hot cylinder head and is torqued against a sealing face. A machined billet plate holds its flatness under that load, which is what stops it weeping. It also looks like a considered part rather than a blanking disc, which matters on an engine that is otherwise on show.

Fitting It

Remove the reed valve cover, take out the valve assembly, clean the sealing face and bolt the plate down in its place. No sealant is needed beyond what the original arrangement used. The job is straightforward on the 457's parallel twin, and there is nothing to adjust afterwards.

Fitment and Compatibility

  • Aprilia RS 457 (2024–2026)

Road Approval

None. The PAIR system is emissions equipment covered by the motorcycle's type approval. Closed-circuit and competition use only.

Specifications

  • Brand: JetPrime
  • Part number: JP ES 042
  • Type: SLS/AIS block-off plate
  • Function: CNC-machined cover plate replacing the original PAIR cover
  • Material: CNC-machined aluminium
  • Installation: plug-and-play, no modification to the original wiring
  • Fitment: Aprilia RS 457 (2024–2026)
  • Road approval: none — closed-circuit and race use only
FitmentWhich bikes this fits
  • Aprilia RS 457 (2024–2026)
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08 · Paddock

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