The Ohlins KA504 STX 36 Twin shock is a rear twin-shock upgrade for the Kawasaki ZRX 400. Built around Ohlins’ STX architecture, it’s designed to deliver consistent damping control and clear chassis feedback across varied road conditions. This unit suits riders who want a more controlled, tuneable rear end without compromising everyday ride quality.

Ohlins | Made to race, perfected to ride

Ohlins suspension is developed with a focus on stability, traction and predictable damping behaviour. The KA504 is part of the STX 36 Twin family, aimed at modernising twin-shock performance while maintaining a classic layout.

Who this shock is for

  • ZRX 400 owners wanting improved rear-wheel control and stability from a twin-shock setup
  • Riders who value damping consistency during longer or harder rides
  • Anyone looking for a quality suspension foundation to match tyres and riding style

Shock design & features

This is a gas-pressurised rear twin-shock design intended to help maintain damping consistency in demanding use. As an STX unit, it’s engineered for controlled response and improved traction compared with basic twin-shock arrangements.

Tuning controls

The KA504 provides adjustable compression and rebound damping, allowing you to tailor the response for road conditions, load and riding pace. These controls are intended to help balance comfort, grip and stability as your setup evolves.

Base setup (factory preset)

This shock is supplied with an Ohlins factory baseline to provide a solid starting point. Fine-tuning should be completed after confirming sag and overall chassis balance with your rider weight and typical load.

Before you install

  • Confirm shock length and stroke suitability for your motorcycle and intended ride height
  • Inspect linkage/bushings and mounting hardware condition before fitment
  • Plan to set rider sag and then adjust damping based on real-world feedback

Öhlins Motorcycle Suspension Warranty

New Öhlins motorcycle shock absorbers, front forks and cartridge kits supplied by Teknik Motorsport are covered by the applicable Öhlins manufacturer’s warranty against defects in materials and workmanship.

Teknik Motorsport is an authorised Öhlins Service Centre and administers warranty claims in accordance with the Öhlins warranty conditions. The service intervals below form part of the maintenance requirements for Öhlins products supplied and supported by Teknik Motorsport.

This warranty is in addition to the consumer guarantees that apply under the Australian Consumer Law.

  • Registered motorcycles — non-competition road use Five years, subject to correct application, installation, setup and servicing every: 20,000 km or two years, whichever occurs first.
  • Registered motorcycles — adventure and light off-road use Five years, subject to correct application, spring rate, setup and servicing every: 10,000 km or annually, whichever occurs first.
  • Unregistered or competition motorcycles Two years for eligible Öhlins MX and Enduro products, subject to inspection every ten hours and servicing every: 30 operating hours or annually, whichever occurs first.

Compliance with the applicable service interval is a condition of the Öhlins manufacturer’s warranty. Evidence of servicing may be required when a warranty claim is assessed.

A seal leak, loss of damping performance or internal wear arising after the prescribed service interval has been exceeded will be treated as a service or maintenance issue rather than a manufacturing defect.

Warranty repairs

Öhlins suspension products are designed to be serviced and repaired. Where a warranty claim is approved, the normal remedy is repair of the customer’s original suspension unit using genuine Öhlins replacement parts.

Replacement of a complete shock absorber, fork or cartridge kit is not automatic and would normally occur only where the product has suffered a manufacturing failure that cannot reasonably be repaired. This is at Ohlins discretion. 

Öhlins spare parts and service kits

Öhlins spare parts, seals, bushes, service kits, springs, fluids and individual components are covered only against defects present when supplied.

No fixed age-based warranty applies to wear items, service parts or consumable components. Wear, deterioration, contamination, incorrect installation and damage caused by another component are not manufacturing defects.

Öhlins gives the customer a meaningful five-year warranty on products (Units), provided the suspension is maintained as suspension should be maintained. Teknik supports that warranty locally, can inspect the product properly, and can repair it with genuine parts rather than discarding it.

SKU KA504
Brand Ohlins
Shipping Weight 5.0000kg
Shipping Size 0.300 x 0.300 x 0.500m
Type Units
See our Shipping Information See our Frequently Asked Questions
Position (Front or Rear) Rear Twin
Shock Length Eye to Eye (mm) 360.0 +10/-0
Spring Rate Standard 16.0 - 26.0 N/mm Progressive
Stroke Metal to Metal (mm) 94.0
Product Family STX 36 Twin
Fitted Spring 00480-12

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