Krooztune
WP35 Fork Flow Kit - KTM Group 50/65cc (Including Air to spring conversion)
Big Piston Flow Kit – KTM 50 / 65 Forks
Say goodbye to harsh, sticky air fork action on your mini racer!
Our Big Piston Flow Kit transforms the WP35 air fork (2020-on KTM / Husky / GasGas 50 & 65cc) into a true dual spring system with real valving—just like the big bikes.
✅ Eliminates the unpredictable air fork "stiction"
✅ Converts to full spring fork for plush feel and better stability
✅ Includes flow piston, top-out springs & conversion hardware
✅ Dramatically improves turn-in, small bump compliance, and rider comfort
✅ Ideal upgrade for serious racing and a smooth action for these light weight riders
Kit fits:
KTM / Husqvarna / GasGas 50/65cc bikes 2020-2024
Installation Tool is Required - WP35 Socket Install Tool
A great tunable cost effective solution to transform the OEM WP35 system into a plush action allowing less rider fatigue, improved turn in and more stabilty accross bumpy terrain. This kit includes all valving and 'air to spring' conversion parts.
A fork spring to match the OEM spring is required if you wish to convert the system to a a true dual spring fork, and is our best setup recomendation to do so. (these bikes have one spring in them in OEM trim) A much smoother less sticky action is produced easily with a conventional dual spring setup.
Full Kit includes:
- top out springs
- WP35 Flow Piston assembly
- Spring convserion parts
- Step by step detailed install instruction
- Install tool available see Install Tool
Spring Recomendation Please note- 50cc and 65cc bikes come with already a single fork spring as OEM to balance with the Oem Air system. We recommend replacing the Air system with our spring conversion parts included in this kit and then balanced with a single spring ( to replace the air ). This will convert fork to dual spring and improve bump action and feeling.
Match with a single spring or a pair of new springs to tuners / suspension builder recommendation.
We can easily assist with spring recommendation via email or phone
contact Info@krooztune.com or 03 9720 0745 as recommended below.
Spring Recommendation / guide : **Some springs not available as a pair
50cc Bikes -
| 15-30kg | 1x 24n Spring used together with oem spring |
65cc Bikes -
| 25-30kg | 1x 26n or 1x 28n for fast rider ( used together with oem Spring |
| 30-35kg | 1x 28n ( used together with oem spring ) |
| 35-40kg | 28n pair |
| 40-45kg | 1x 30n ( used together with oem spring ) |
| 45kg + | 32n pair |
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Product information
PRODUCT FEATURES
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F.A.Q.
They appreciate cut and details, things that aren't so obvious.
Do you offer setup advice with this product?
Absolutely.
Every purchase includes access to our Setup Form, where we provide personalised guidance on your ideal settings, spring rates, and upgrade choices.
Can I purchase items with another currency?
Yes, you may select a currency based on your personal preference. When you select your country in the country selector and set to your country’s version of the website, you will see prices listed in the regional currency.
Can I make changes to my order after it’s been placed?
Email Info@krooztune.com asap and quote your order number. Our emails are checked daily before shipping out any orders
What if I have issues or need support after buying?
We’re here to help.
You can reach us anytime for setup adjustments, technical questions or installation support. Krooztune products are backed by real riders and real workshop support.
Do I need to pay extra tariffs or taxes when ordering from the USA?
No — Krooztune covers all USA tariffs and import taxes.
The price you see at checkout is final, with no hidden fees or surprise charges upon delivery.
