⟲ 360° — drag meThe facts.
| Model | JP MJ 008 |
|---|---|
| Manufacturer | JetPrime |
| Material | CNC-milled Ergal 7075 |
| Fits | Kawasaki Z400 (2019–2023) |
| Installation | Plug-and-play, no wiring harness modifications required |
DescriptionThe whole story▼
The JP MJ 008 is a two hundred gram module for the Z400 that does one thing: it lengthens or shortens the injector pulse the standard controller decided on.
Key Features
- Kawasaki Z400 (2019–2023)
- Preset fuel module, no programming required
- Corrects the mixture without remapping the original electronics
- Plug-and-play with model-specific wiring
- Around 200 g, fitted in an evening
- Unplugs at any time, nothing is written to the motorcycle
A Licence Class Bike
The 399 cc twin is limited by regulation rather than ambition, which means it spends most of its life at full throttle making its power.
Against a Full Remap
Flashing the original controller changes ignition timing, rev limits and rider aids as well as fuelling, and it needs specialist equipment. A module is narrower, cheaper and reversible in a minute, which suits an owner who wants one problem solved.
No Laptop Required
JetPrime works out the curve for that engine and ships it in the module. There is no software to install, no cable to buy and no afternoon spent learning an interface, which is the entire point of the preset version.
The Limits of a Module
It cannot repair a mechanical fault, cannot raise a rev limit and cannot alter ignition timing. Everything it does is fuel quantity, which is a narrow tool used precisely.
Two Products, One Catalogue
JetPrime sells this alongside a programmable unit at a considerably higher price. The choice is between a curve somebody else worked out and a curve the owner works out themselves.
Before a Dealer Visit
Most owners unplug it. It takes five minutes, leaves the connectors as they were and removes a conversation that is easier avoided than had.
On a Motorcycle With Two Owners
A shared machine ridden by somebody who does not know the module is there will notice nothing at all. It changes nothing about how the motorcycle is operated, only how it responds.
Big Singles
A thumper is the clearest case of all. With one cylinder and one firing event every other revolution, any hesitation at small openings is felt directly through the chassis.
Fitment and Compatibility
- Kawasaki Z400 (2019–2023)
Specifications
| Model | JP MJ 008 |
|---|---|
| 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 power module
FitmentWhich bikes this fits▼
- Kawasaki Z400 (2019–2023)
Questions, one topic at a time.
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Our team is happy to help. Use the contact button below and we’ll personally help you choose the right gear or part.
Measure your head circumference about one centimetre above your eyebrows and compare it with the size chart on this page. Between sizes? Choose the smaller one — the padding beds in with use.
Yes — it’s tested and approved to the current ECE 22.06 standard and road-legal across the EU.
Most of our touring and sport helmets are Pinlock-ready and many include the insert. Check the ‘What’s in the box’ section on this page for this model.
Yes — the cheek pads are channelled so the arms of your glasses slide in comfortably.
Take out the washable lining and hand-wash it in lukewarm water. Clean the shell and visor with a soft cloth and water only — never solvents.
Our team will personally help you choose the right gear or part — around 24h for a reply.