JetPrime PAIR system eliminator cover for Kawasaki Z400 (2019–2023) – JP ES 024
02 · Data & docs

The facts.

Technical data
ModelJP ES 024
ManufacturerJetPrime
MaterialCNC-milled Ergal 7075
FitsKawasaki Z400 (2019–2023)
InstallationPlug-and-play, no wiring harness modifications required
FitmentKawasaki Z400 (2019–2023)
Road approvalNone — closed-circuit and race use only
DescriptionThe whole story

The JP ES 024 caps the Z400's secondary air ports with a cover turned from solid aluminium.

Key Features

  • Kawasaki Z400 (2019–2023)
  • 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 First Big Bike

The Z400 sells to riders leaving a 125 behind, and Kawasaki's dealer network has benefited from every one of them.

Replaced by the Z500

Kawasaki enlarged the engine for 2024 and kept the rest. The Z400 is now an unusually good used purchase for anybody on a restricted licence.

Reversible

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

Machined Rather Than Cast

Turned from billet with the sealing face cut in one operation, which is why it seals on a ring alone rather than needing compound.

An Inspection Would Find Nothing

Original fasteners, original torque and an unmarked head face. The exchange leaves no evidence beyond the cover itself.

Why This Is Not Urgent

There is no reason to touch a system that still seals. This becomes worth doing when the petals have aged out, or when the motorcycle is being stripped of its road equipment for other reasons entirely.

Nothing Hidden

The cover is visible to anybody who looks at the engine, which is the correct way for a change of this kind to work.

Heat, Not Distance

A garage queen's reeds age at the same rate as a courier's, because it is the warm-up cycles rather than the kilometres that finish them.

A Restricted Licence Bike

Most Z400s are ridden by people who cannot legally ride anything faster, which means they are ridden hard and maintained on a budget. Both facts shape what modifications make sense on one.

Sugomi Styling

Kawasaki's angular design language applied to a small motorcycle, where it works better than on some of the larger ones. It is unmistakable from a considerable distance.

Fitment and Compatibility

  • Kawasaki Z400 (2019–2023)

Specifications

Model JP ES 024
Manufacturer JetPrime
Material CNC-milled Ergal 7075
Fits Kawasaki Z400 (2019–2023)
Installation Plug-and-play, no wiring harness modifications required
What's includedEverything in the box
  • 1x block-off plate
FitmentWhich bikes this fits
  • Kawasaki Z400 (2019–2023)
07 · Support

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08 · Paddock

Before you go.

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