JetPrime JP ES 041 Ducati SuperSport 939 S — PAIR system eliminator cover — view 1 360° — drag me
02 · Data & docs

The facts.

Technical data
ModelJP ES 041
ManufacturerJetPrime
MaterialCNC-milled Ergal 7075
FitsDucati SuperSport 939 S (2017–2020)
InstallationPlug-and-play, no wiring harness modifications required
DescriptionThe whole story

The JP ES 041 seals the SuperSport 939 S's secondary air ports with a solid cover, removing one of the few genuinely perishable parts bolted to a cylinder head.

Key Features

  • Ducati SuperSport 939 S (2017–2020)
  • Blanks the secondary air ports in the cylinder head
  • Machined from solid aluminium
  • O-ring sealed, no jointing compound
  • Original fastener positions
  • Standard housing refits at any time

Two Hundred and Ten Kilograms

Wet, essentially the same as the standard bike. The difference between the two is entirely in how they behave over a bumpy surface.

Aluminium Instead

A cover machined from solid, sealing on an O-ring in a turned groove. There is nothing inside it to age and nothing to inspect for the life of the engine.

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

A working system does no harm. The case is strongest on an older motorcycle where the reeds are past their life, or on one being fully converted.

Why the Housing Fails

It is a moulding bolted directly to a cylinder head, living through the widest temperature range on the motorcycle several times a day. The reeds flex on every closed throttle and eventually one cracks.

Both Ends Need Closing

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

A Repair Wearing Another Name

On any Ducati past its first decade the reed housing has limited working life left. Fitting aluminium removes a job that was coming rather than merely deleting an emissions device, which is why the argument is strongest on older machines and weakest on new ones.

Why the Cover Does Not Need a Gasket

The head face is machined and flat, so a rubber ring in a turned groove seals against it with the fastener load doing nothing more than holding the two together. A paper gasket in the same place would bond, tear on removal and leave the owner scraping a cylinder head for an hour.

Fitment and Compatibility

  • Ducati SuperSport 939 S (2017–2020)

Specifications

Model JP ES 041
Manufacturer JetPrime
Material CNC-milled Ergal 7075
Fits Ducati SuperSport 939 S (2017–2020)
Installation Plug-and-play, no wiring harness modifications required
What's includedEverything in the box
  • 1x block-off plate
FitmentWhich bikes this fits
  • Ducati SuperSport 939 S (2017–2020)
07 · Support

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08 · Paddock

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