JetPrime JP ES 044 Kawasaki — SLS/AIS Block-Off Plate — view 1 360° — drag me
02 · Data & docs

The facts.

Technical data
ModelJP ES 044
ManufacturerJetPrime
MaterialCNC-milled Ergal 7075
FitsKawasaki ZX-4 RR (2024–2026)
InstallationPlug-and-play, no wiring harness modifications required
FitmentKawasaki ZX-4 RR (2024–2026)
Road approvalNone — closed-circuit and race use only
DescriptionThe whole story

The JP ES 044 caps the ZX-4 RR's secondary air path at the cylinder head with a solid cover.

Key Features

  • Kawasaki ZX-4 RR (2024–2026)
  • Blanks the secondary air ports in the head
  • Machined from solid aluminium
  • O-ring sealed, no jointing compound
  • Original fastener positions
  • Standard housing refits at any time

A Steel Trellis

Shared in principle with the Ninja 400, reinforced for the extra weight and power. It keeps the bike narrow and the cost sensible.

Fifteen Thousand Revolutions

Where the engine finally comes alive, which is a rev ceiling almost nothing else on sale approaches. Riders either love it or never get used to it.

Reversible

The standard housing refits on its own fasteners with no replacement seals required, so the engine returns to specification whenever it needs to.

Access

The tank and frequently the airbox come off to reach the housing, which is why this belongs in the same session as the electrical half or any other work under there.

Keep the Housing

It refits in twenty minutes with no new seals, and having it is what turns an emissions inspection or a suspicious buyer into a straightforward evening.

What the Reeds Do

They allow air in one direction only, so exhaust pressure cannot push gas back towards the filter. When one cracks that protection disappears and the evidence turns up inside the airbox.

Why an O-Ring

A machined face against a rubber ring seals reliably and separates cleanly years later. Paper and compound both bond to the head and have to be scraped away.

The Airbox End

Removing the housing leaves an opening where the hose attached, and unfiltered air into an intake is a worse outcome than the system ever was.

An Extraordinary Specific Output

Eighty horsepower from four hundred cubic centimetres is a figure almost nothing else on sale approaches, and it comes entirely from revs. Everything bolted to that engine works harder as a result.

Fitment and Compatibility

  • Kawasaki ZX-4 RR (2024–2026)

Specifications

Model JP ES 044
Manufacturer JetPrime
Material CNC-milled Ergal 7075
Fits Kawasaki ZX-4 RR (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
  • Kawasaki ZX-4 RR (2024–2026)
07 · Support

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08 · Paddock

Before you go.

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