⟲ 360° — drag meThe facts.
| Brand | JetPrime |
|---|---|
| Part number | JP KS KA004 (black) |
| Function | Ignition block replacement kill switch button |
| Material | Solid-machined Ergal (7075 aluminium) |
| Button protection | IP69K |
| Weight saved | Approximately 350 g versus the standard ignition block |
| Supplied with | Key Box for the original key and immobiliser antenna |
| Installation | Plug-and-play, fully reversible, no loom modification |
| Fitment | Kawasaki ZX-4 RR (2024–2026) |
| Road approval | None — closed-circuit and race use only |
DescriptionThe whole story▼
The ZX-4 RR is Kawasaki's four-cylinder 400 — a genuinely unusual thing in 2024, and a bike bought almost exclusively by people who intend to rev it. On a machine sold on the strength of its top end, a steel ignition barrel on the top yoke is the most obviously removable weight there is. JP KS KA004 removes it.
Key Features
- Cut for the Kawasaki ZX-4 RR, 2024 through 2026
- Replaces the ignition block, barrel and key entirely
- Roughly 350 g saved — a real proportion on a 400
- Machined Ergal billet housing, anodised black
- IP69K push button, sealed for pressure washing
- Key Box included for the Kawasaki immobiliser
Small Bike, Same Barrel
Manufacturers do not scale ignition assemblies to engine capacity. The lock, barrel and bracket on a ZX-4 RR weigh close to what the equivalent parts weigh on a litre bike, which means the 350 g saved is a larger share of a smaller total — and it comes off the steering head, where mass costs the most in turn-in effort.
Shared With the ZX-10 R
JetPrime lists this part number against the ZX-10 R and ZX-10 RR as well as the ZX-4 RR. Kawasaki uses a common ignition mounting and connector across the current ZX range, which is why one switch covers bikes as different as a 400 four and a superbike.
Fitment and Compatibility
- Kawasaki ZX-4 RR (2024–2026)
Road Approval
None. This part removes a component covered by the motorcycle's type approval and is sold for closed-circuit and competition use only.
In the Box
Supplied as a finished assembly: the anodised Ergal switch body with the IP69K button fitted, the Key Box housing for the original key, and the harness tail that mates to the Kawasaki ignition plug. Nothing needs sourcing separately and there is no wiring to interpret — the connector that came off the barrel goes onto the switch.
Specifications
- Brand: JetPrime
- Part number: JP KS KA004 (black)
- Function: ignition block replacement kill switch button
- Material: solid-machined Ergal (7075 aluminium)
- Button protection: IP69K
- Weight saved: approximately 350 g versus the standard ignition block
- Supplied with: Key Box for the original key and immobiliser antenna
- Installation: plug-and-play, fully reversible, no loom modification
- Fitment: Kawasaki ZX-4 RR (2024–2026)
- Road approval: none — closed-circuit and race use only
FitmentWhich bikes this fits▼
- Kawasaki ZX-4 RR (2024–2026)
Questions, one topic at a time.
Get the real shipping cost for this item to your address — the same rates as checkout.
Choose a destination and hit Estimate — we fetch the live rates for this item.
We’re based in Germany. Standard delivery goes by DHL and national postal services and takes about 2–5 days within Germany, 1–2 weeks within the EU and 2–6 weeks outside the EU. Need it sooner? Express delivery reaches most of the world within a few days — just choose it at checkout where available.
Your exact shipping cost is calculated by destination and weight and shown at checkout before you pay — no hidden fees. Express delivery is selectable at checkout where available.
Yes, we ship to over 130 countries. Prices, taxes and delivery times for your destination are calculated automatically at checkout.
Within the EU, no — our prices already include all duties and EU VAT. For deliveries outside the EU (e.g. Switzerland, the UK or the USA), your order may be subject to import duties and taxes set by your country. These are collected by the carrier when your parcel arrives, aren’t included in our prices, and are outside our control.
As soon as your parcel ships we email you a tracking link, so you can follow it all the way to your door.
On out-of-stock items you can request a delivery time or leave your email to be notified the moment it returns — just use the notification box on the product.
You have the right to cancel within 14 days of receiving your order. Register your return by email first; once it’s approved you have a further 14 days to send the goods back. Items should be unused and in their original packaging.
Register your return by email with your order number before sending anything back, and we’ll send you the return instructions. Please note: returns that aren’t registered in advance can’t be accepted.
The quickest way is to place a new order for the size you need and register a return for the original by email — just let us know it’s an exchange.
We’re sorry — that shouldn’t happen. Contact us with your order number and a photo as soon as you can, and we’ll arrange a replacement or refund right away. Faulty goods are always covered by your statutory warranty.
Refunds go back to your original payment method, usually within 3–5 working days of your return reaching our warehouse.
PayPal, all major credit and debit cards (Visa, Mastercard, American Express), Klarna (pay later and instalments), Apple Pay, Google Pay and more — all processed securely via PayPal and Mollie.
Yes. Choose Klarna at checkout to split your purchase into flexible monthly installments.
Your payment is taken when you place your order. If you choose Klarna, you pay later according to Klarna’s terms.
Every payment runs over an SSL-encrypted connection through certified providers. We never see or store your full card details.
If your order hasn’t shipped yet, contact us as soon as possible and we’ll do our best to change or cancel it.
No — you can check out as a guest. An account simply lets you track orders and reorder faster.
For customers in the EU, prices are shown including your country’s local VAT. For customers outside the EU, prices are shown without VAT — instead, your country’s import taxes and duties may apply on delivery (see the customs question).
Yes. Your invoice is attached to your order confirmation email and is also available in your account.
Yes. We’re an authorised dealer, so every product is 100% original and comes with the full manufacturer warranty.
Yes. Everything we sell is genuine and comes with the manufacturer’s warranty, on top of your statutory rights. Keep your invoice as proof of purchase and contact us if you ever need to make a claim — we’ll help you through it.
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.