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 Tuono 457 (2024–2026)
Road approvalNone — closed-circuit and race use only
DescriptionThe whole story

The Tuono 457 runs the same parallel twin as the RS and the same secondary air system on top of it. Remove the reed valves and the head is left open; JP ES 042 is the machined plate that closes it.

Key Features

  • For the Aprilia Tuono 457, 2024 through 2026
  • CNC-machined aluminium plate in place of the original PAIR cover
  • Seals the cylinder head port after the reed valve is removed
  • Bolts to the original mounting points
  • No electrical connection — this is the mechanical part of the delete
  • Same part number as the RS 457

What the Plate Does and Does Not Do

It closes a hole. That is the whole job, and it is worth being clear about it: the plate does not stop the ECU from looking for the PAIR solenoid, and on its own it will leave a fault on the dashboard. The solenoid eliminator is the part that handles that, and the two are usually bought together.

Visible on a Naked Bike

On the faired RS this plate is hidden behind bodywork. On the Tuono the cylinder head is largely on show, so the finish of anything bolted to it is part of how the engine looks. A machined and anodised plate reads as intentional; a flat blank does not.

Fitting It

Unbolt the reed valve cover, remove the valve, clean the face, fit the plate with the original fasteners. There is nothing to time, adjust or bleed, and the engine can be started immediately afterwards — with the caveat that the dashboard will show the PAIR fault until the electrical side is dealt with.

Fitment and Compatibility

  • Aprilia Tuono 457 (2024–2026)

Road Approval

None. Closed-circuit and competition use only.

Torque and Sealing

The plate bolts into an aluminium cylinder head, so the fasteners want a moderate torque rather than an enthusiastic one — the head thread will give up long before the bolt does. Clean the mating face properly before fitting: the original gasket surface usually carries a ring of baked-on residue that will hold the plate off just enough to weep once the engine is hot.

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 Tuono 457 (2024–2026)
  • Road approval: none — closed-circuit and race use only
FitmentWhich bikes this fits
  • Aprilia Tuono 457 (2024–2026)
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