JetPrime JP ES 660 Aprilia — SLS/AIS Block-Off Plate — view 1 360° — drag me
02 · Data & docs

The facts.

Technical data
ModelJP ES 660
ManufacturerJetPrime
MaterialCNC-milled Ergal 7075
FitsAprilia Tuono 660 (2021–2026)
InstallationPlug-and-play, no wiring harness modifications required
FitmentAprilia Tuono 660 (2021–2026) / Aprilia Tuono 660 Factory (2021–2026) / Aprilia Tuareg 660 (2021–2026) / Aprilia Tuareg 660 Rally (2025–2026)
Road approvalNone — closed-circuit and race use only
DescriptionThe whole story

The JP ES 660 caps the Tuono 660's secondary air port with a machined aluminium blank.

Key Features

  • Aprilia Tuono 660 (2021–2026)
  • 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

The Physical Half

A reed box on the cylinder head with a hose to the airbox. Silencing the solenoid electrically leaves all of it bolted in place.

Why It Matters on This Bike

With no fairing, the top of the engine is on display and the exhaust note reaches the rider directly. Both arguments point the same way.

O-Ring Sealed

A rubber ring in a machined groove rather than compound on a flat face. It comes apart cleanly whenever it needs to.

Ninety-Five Horsepower

Softened slightly from the RS 660 tune to suit the wide bars. On a road the Tuono is quicker than the faired bike more often than anyone admits.

A Real Pillion Seat

Unusually for the class, someone can sit on the back for an hour without complaining. Aprilia treated the Tuono as a road bike first.

Before a Remap

Unmetered air after combustion moves the lambda readings, and everything decided from those numbers is built on the error.

Original Fasteners

Aprilia's own bolt spacing and torque values. Nothing is drilled and the casting is untouched.

The Circuit Remains

Blanking the head does not stop the controller testing the solenoid. That fault needs the electrical eliminator.

Homologation

Removing emissions equipment ends road legality across Europe.

Reversible

The standard housing refits with nothing consumed in either direction.

Two Hundred and Seventy Degrees

The crank spacing gives the parallel twin an uneven beat and the traction feel of a V-twin, which is deliberate and is most of why the engine is likeable. It also means the exhaust note is unlike anything else in the class, fairing or no fairing.

Fitment and Compatibility

  • Aprilia Tuono 660 (2021–2026)

Specifications

Model JP ES 660
Manufacturer JetPrime
Material CNC-milled Ergal 7075
Fits Aprilia Tuono 660 (2021–2026)
Installation Plug-and-play, no wiring harness modifications required
What's includedEverything in the box
  • 1x block-off plate
FitmentWhich bikes this fits
  • Aprilia Tuono 660 (2021–2026)
07 · Support

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08 · Paddock

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