JetPrime JP ES 041 Ducati — SLS/AIS Block-Off Plate — view 1 360° — drag me
02 · Data & docs

The facts.

Technical data
ModelJP ES 041
ManufacturerJetPrime
MaterialCNC-milled Ergal 7075
FitsDucati Monster 821 (2015–2021)
InstallationPlug-and-play, no wiring harness modifications required
FitmentDucati Monster 821 (2015–2021)
Road approvalNone — closed-circuit and race use only
DescriptionThe whole story

The JP ES 041 blanks the secondary air ports on the Monster 821 using Ducati's own fastener positions, with nothing drilled and no thread in the head disturbed.

Key Features

  • Ducati Monster 821 (2015–2021)
  • 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

The Middle Monster

Between the 797 and the 1200, and arguably the one that made the least sense of the three. Owners who chose it tend to be very fond of them.

Plastic on a Hot Casting

The housing endures the widest thermal swing on the motorcycle. Reeds crack with age rather than mileage, and a cracked reed passes gas the wrong way.

Keep the Housing

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

What Is Gained

One fewer perishable component, a tidier top end and an exhaust port that cannot admit anything. No power and no consumption change.

On a V4

Ducati packages four cylinders into a very compact space, and access to anything on the rear bank means the tank and the airbox out of the way.

Sold Separately

Some owners want the fault gone and nothing else. Ducati's split arrangement lets them stop there without leaving anything mechanically wrong.

An Inspection Would Find Nothing

Original fastener positions, original torque and an unmarked sealing face. The exchange leaves no evidence beyond the cover itself, and the standard housing refits in twenty minutes with no replacement seals required whenever the motorcycle needs to be back at specification.

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 Monster 821 (2015–2021)

Specifications

Model JP ES 041
Manufacturer JetPrime
Material CNC-milled Ergal 7075
Fits Ducati Monster 821 (2015–2021)
Installation Plug-and-play, no wiring harness modifications required
What's includedEverything in the box
  • 1x block-off plate
FitmentWhich bikes this fits
  • Ducati Monster 821 (2015–2021)
07 · Support

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08 · Paddock

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