WP AER and 4CS 48mm to KYB Fork Internals Conversion
All parts included as per photo - including cartridge and springs.
This is a complex kit to install - so we suggest professional fitment only.
Kit uses 43.5 x 470mm fork springs - please select the rate you require from the drop down.
The Kayaba Upgrade kit improves the behaviour of the front fork through increased performance and feedback.
Maintains the flex of the original inner and outertubes that has been designed for KTM & Husqvarna frames.
The KYB feel combines perfectly with the KTM & Husqvarna character - giving it a very smooth feel - eliminating the harshness while building up a progressive damping profile toward the end of the stroke.
Springs
You should consult the suspension specialist fitting this kit for the correct spring rates for your weight / bike / ability / track / etc...
In general we recommend lighter springs for 2 stroke and smaller capacity engines and heavier springs for 4 stroke and large capacity engines.
With the above disclaimers in mind we have provided a rough guide below:
| Rider Weight (In Gear) |
Spring Rate |
| 60-70 kg |
4.2 N/mm |
| 70-80 kg |
4.4 N/mm |
| 80-90 kg |
4.6 N/mm |
| 90-100 kg |
4.8 N/mm |
| 100-110 kg |
5.0 N/mm |
| 110+ kg |
5.2 N/mm |
