KTM / Husqvarna MX

The KTM and Husqvarna  WP48 Air to spring conversion kit is aimed to suit all the range of KTM's and Husqvarna that come equipped with the WP48 AER fork as standard.  This includes Ktm's SXF, SX ,XC and XCF models as well as Husqvarna's equivalent bikes in the FC, TC,TX and FX range. 

If its got WP AER48 forks in your bike as OEM equipment , this kit will fit. No need to ever set air pressure again, transforming front end feel, corner entry and less pressure / spring rate variables whilst riding over long distance.

Install Video:

Our WP Air to spring conversion kit is a complete replacement cartridge assembly for your current WP AER setup.  It is designed to completely remove all the Air system from your current WP AER 48 fork  and replace it with a preload adjustable spring and cartridge setup.  High Quality German Engineered ‘Eibach’ Springs are available to suit varying rider weights.  Please advise upon order which spring you require (see recommendations below) or let us know your weight and speed  and we will recommend the best spring for you. 

This kit fit's in minutes.  If you can pull down and service your fork seals on the WP AER 48 fork you can install this kit. Info and instruction included.

Spring Rate Recommendation 

 250F and 2 Strokes 

450F 

General riding & Motocross applications

These recommendations  are a guide only as fork Springs are weight and speed dependent. For example a 72 kg Pro rider falls into the 0.88kg/mm category but may well be better suited to a 0.92kg spring due to the much higher corner entry speed and the ability to hit large bumps at high speeds. Please note this guide is for rider weight ‘without’ gear.

Please note we have had great results using one spring down for Veteran/ C level riders on the 450 machines.  Eg. 90kg rider running a 0.96kg/mm spring for a plusher ride.

For more accurate advice please consult your local suspension tech or send us an email.

 Rider weight Spring Recommendation ( Pro Level riders may consider one rate harder than recommended due to the faster speed and need for 'hold up')

Key Features

• Never have to set your air pressure ever again.
• Much more reliable fork
• Super smooth action resulting from our tested spring guidance system. 
• Hydraulic Bottoming resistance using our tapered bottoming piston and seat.
• No Fade out or pump up in pressure over long moto’s
• A Constant feel in your front end that  is more consistent throughout the ride
• Spring Pre load adjustable minimal tools are required for fitment. If you have the Fork cap and basic tools to remove the standard OEM Air cartridge you will have the ability to fit up our kit.  Our cartridge kit is made from High grade 6061 Aircraft Grade Alloy , Chrome Moly rods and Anodised for a Factory Finish. Instruction manual included.

Parts included in the kit

• Fully Complete Cartridge assembly including Bottoming Cone and preload washers 
• Optional Selected Eibach spring to suit this kit

Nitrogen Gas Bladder Conversion for WP Linkage shocks.

 Improved bump absorption and less fade.  Kit runs a genuine Showa Bladder for ease of re order and durability.

Fits :

KTM All 2016-20  SXF / XCF / XC / SX

Husqvarna    All 2016-20  FC / FX / TX / TC / FS   

Fork and Shock Lowering kit designed to lower your WP Xplor EXC Suspension 

Fits: EXC/EXC-F/XC-W/XCF-W 2017 – 2021 models

The Krooz Racing Lowering Kit is designed to be installed with the suspension completely stripped apart. E.g. during a complete suspension service. This install should only be undertaken by a qualified suspension tech or mechanic with knowledge and confidence in general fork and shock rebuilding and suspension part fitment.

Forks are lowered via the acedal spacers installed on the rebound rods.  Shorter spring seats are suplied to keep spring preload the same as oem spec.

Shock is lowered via a custom machined base plate installed via shock service / build procedure.  

Manufactured and CNC machined here in Australia to include 4 variants designed to lower your WP Xplor Suspension in either 20, 30, 40 or 50mm. 

Our fork kit is made from billet alloy and matched with Acedal fork De-strokers. The Shock Base plate is machined from billet steel just like the OEM unit to retain factory function.  

This lowering kit is finished in all black to result in a factory look finish inside your forks and shock. 

Kit includes:

• 2 x Fork De-strokers
• 2 x Fork Spring Seats
• 1 x Shock De-stroker base plate
• Instruction

Our fork de-stroker kit simply installs on the Rebound/Damper rods against the original ‘top-out’ spring to professionally lower the fork.  The krooztune engineered billet alloy spring seats are then required to replace the oem seats to keep fork spring preload to spec.

Lowering the shock absorber is achieved using our CNC billet steel base plate, completely replacing the OEM unit and retaining original function whilst being lower.

The result is a bike that is professionally lowered and balanced just like the OEM stock bike, but with a lower seat height.    

Kits will fit WP Xplor Forks and Shocks

EXC-F / XCF-W all models 2017-2021

• 500 EXC-F / XCF-W
• 450 EXC-F / XCF-W
• 350 EXC-F / XCF-W
• 250 EXC-F / XCF-W

EXC XC-W

• 300 EXC / TPI / XC-W
• 250 EXC / TPI / XC-W
• 150 EXC / TPI / XC-W

This kit will not fit the XC/XC-F models.  Although they have Xplor forks it is matched to a WP Xact linkage style shock. Our kits for these are available here: 

Kits Available to fit all Husqvarna TE/FE 2019-2020 Models.

A complete Suspension Upgrade kit for the Xplor/Xact Equipped Husqvarna FE Offroad models. This kit includes extensive Krooztune Engineered Hard Parts and 3 Trail tested setting options so you can best decide the base setting most suited to your speed and skill level.  Matched with our 4 variant rebound setting this allows you to custom build your best setup.  

All info and specifications and advise are supplied in the kit backed up with email support direct from Krooztune HQ.

Fork and Shock options are supplied in our Specification sheet with simple easy to follow tuning options for both Rebound and Compression.

Full Instructions to install both the Fork kit and the rear Bladder can be found here

All shock absorbers should be built with the usual shock building procedures. If in doubt leave this to a local qualified motorcycle mechanic or suspension builder. We offer an easy shipping service with in AUS to make this step a breeze. 

Kit Setting Soft - Medium - Firm 

                                      *Optional shims are included to adjust to all 3 setup's.

3 Setting Option - Fork and Shock 

1. Soft - Suits plush setting that absorbs all initial hits with ease. We have great results with this setting with our Vet / Older guys that dont want to get beat up all day on long rides. This setting is great for rocky terrain with square edge / tree roots hits.  
2. Medium - Average fitness, Average speed great all round setting . A balance between soft and firm. Bump absorption with great hold up.  A setting that is both initally plush and still holds up.  This setting is great combined with adjusting the FA adjuster to suit specific terrain.  Riding rocks? Click the FA out a few softer in seconds.  
3. Firm - Ex Mx racer or fit / fast / tall guy riding on the trails at pace?  This setting works well for guys that like a firmer mx style feeling.  Rip hard fast trail sections with ease.  Still not too firm but enough to charge hard.  We have tested our Trail setups on local MX tracks just to see what they can handle. Although the Offroad bikes felt a little heavier, slower and plusher than our MX race setups at the time of testing this,  we had a blast with embarrassingly fast 'FE' lap times compared to our laps on the setup Mxer's! 

All kits Shipped with Base setting installed 'Medium' 

"Trail tested in real world conditions"

Compression and Rebound Selection Options - Build your Own Custom Setup

All our Husqvarna Shock and Fork setting and data are supplied with various rebound settings ( 4 different variants to choose from) to suit all spring rates.  Running OEM rebound damping on a stock oem shock for example will result in a super springy uncontrolled shock.  The OEM setting does not offer enough control or damping to control a much heavier spring rate.  

Choose a base compression setting from Soft/Medium/Firm and match it with the correct rebound in our specification sheet ( choose to match to your spring rate , info supplied) and you will have a superior rear end that is adjustable and controlled.  

Kit Includes :

• Xplor FA48 Flow Adjuster kit (inc specification / shims)
• Xact Linkage Shock  Setting and Shims
• Xact Nitrogen Bladder Kit
• Shaft Clamp tool 
• Settings sheet including 3 valving setup options and shims to adjust.  Soft - Medium - Firm 
• Instructions - Xplor FA48 Flow Adjuster Install /  Xact Nitrogen Bladder kit
• Decal Set 

 See individual Kits and parts for detailed info 

**Kit is recommended to be fitted by a competent suspension tuner or service shop.  

2012-2020 KTM/Husqvarna 250/350 Manual cam chain tensioner.

As Used by our championship rider Wilson Todd - 2019 MX Nationals Champ #1!!

Set by experienced engine builder only.

Qty prices available for dealer inquiry  

Fits 2017-2021 Ktm / Husqvarna AER48 fork.

A complete Mid Post piston kit  to suit all AER48 forks.  This piston assembly allows the compression shims to float (similar to Showa and KYB units) allowing instant plushness and rider feel.  We are using the OEM piston in pro level setups ( MX National Level) that need the superior hold up over very big bumps at speed.  This is not the majority though and we find many riders require a plusher feeling 

From low A right thru to Vet level and juniour racers this kit allows a more forgiving fork that can be tuned from soft offroad right up to senior mx.  

Kit includes:

• Piston and top plate
• Shim stack rebound ( inc optional setting)
• Shim Stack Compression ( inc optional setting)
• Complete post assembly 
  
• Mid Comp Spring
• Instruction and Setting sheet to adjust base setup 
• Optional setting inc for Light and heavy rebound settings
• Junior , Offroad , Vet MX and pro MX setting supplied.  

Kit requires the oem piston band and oring to be swapped accross at time of intall.  Suspension tech or a mechanic with suspension service knowledge will be required to install this part into the fron forks.  

Kits available for all WP AER and Xplor Forks.  KYB kits are ready to go with a B level Setting to suit MX in AER and Offroad in Xplor setting.

 Contact us now to inquire about a KYB cartridge kit pre set and valved specifically for you .  Rider weight, spring rate selected and valving settings installed at no cost prior to shipping.  Kits and Genuine Springs near always in stock.

• Convert your WP AER48 forks into KYB AOS Spring Forks - 

• 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 -

• Every individual cartridge kit fitted will be setup here at krooztune to suit Australian rider condition and speed.

• Personal setting based on the riders weight and bike

This Kit Includes:

2 x Cylinder Assemblies

2x Compression Base Valve Assembly 

1 Set of billet axle Brackets

2 x Oil Lock / Hydraulic stop

1 x set of fork springs ( rated to weight / speed)

2 x Litre KYB oil 

Please call or email the shop to organise a pre booking to have this kit installed and setup exactly for your needs.  Please email krooztune@krooztune.com or thru contact page  for any inquiry

A complete performance linkage system to suit WP equipped Linkage bikes

Fits: KTM / Husqvarna 2017-22 and the new Gas Gas models 2021-22

Recommended to run with 1-2 spring rates firmer than OEM recommendation.  We advise shock settings or clickers be adjusted by an experienced tuner to better match the stiffer spring rate required.

The result:

• A free shock action with less mid stroke spike or ramp up.
• Allows a more true to weight spring rate
• Less pitch onto the forks with matched rebound damping rates
• Easier to achieve full stroke movement across rough terrain without dumping internal compression valving. We feel this is a must have with light juniors or off road racers.
• Soft to hard at a more controlled level.

Our system is a complete linkage assembly that changes the rising rate.  In simple terms this WP performance linkage system has a softer feeling, it’s more linear.  Not as soft as WP’s offering on KTM models Pre 2016, but nowhere near as hard or aggressive as the 16-22 linkage WP is utilising in the SXF / XCF and some Husqvarna models.  

By heading back towards a more true to weight spring rate (we are around 48n to 51n for most riders) with our linkage we have achieved a more free rear end. Less mid stroke spike and more fluid motion into the guard especially with lighter weight riders.  This was for us very noticeable with all junior and Veteran level motocross racers and especially in enduro/off-road for all riders.  Less wheel lift from the ground and more travel easily utilised across very rough terrain.

The accelerated shaft speed caused by WP Xact’s newest style steep rising rate linkage caused too many problems leaving internal valving critical from rider to rider and too variable across different terrains.   A very small window of tuning form too soft to hard resulted.

This hard / aggressive style of linkage is obvious with the need to run a very soft rate of spring fitted in oem trim. 2016-2022 model bikes ran around for example 39n (125) to a 42n (250F) spring as standard from the manufacturer. This soft spring matches the steep rising rate linkage.  A big difference from the norm, way outside the spring rates we are used to in mx and off road suspension tuning.

The older style WP/KTM linkage (from pre 2016 era) ran around 54n to 57n as a standard rate for reference, but many found this too lazy in action and with poor bottoming resistance.  

Comparing notes on these 2 varying popular linkages a big difference in oem spring rate is easily noted, with our KTM performance linkage we feel we have tested near the middle of these two options trying to engineer our linkage to take most advantage of both these varying designs.  On track with many local suspension tuners and riders we have already had great success.

 Air to spring conversion to suit WP AER35.   KTM-HSQ-GAS 65cc bikes

Install tool required also - Install Tool 

This fork works in conjunction with the OEM single spring (RHS) / air (LHS) setup , transforming this forks action and returning it to a more conventional ‘dual’ spring fork.

The oem system is great for adjusting from soft to hard but simply has too much fork stiction ( due to the large Air piston)  and poor performance for the light weight 50 and 65cc racers.  Our spring conversion Eliminates the need to constantly check air pressure and returns the WP 35 fork back to a smooth operation as to be expected for light weight riders, improving turns, tyre grip and less front end wash outs.

Available with a single spring to match the oem rate or dual spring to accurately match rider weight.  

Spring rate Supplied:

• 28n - suits rider 30-40kg
• 30n - suits rider 40kg +
• 30n Pair - suits rider 40kg + fast rider requiring a fimer front fork 

Fits: 50 and 65cc KTM, Husqvarna and Gas Gas 50 and 65cc bikes as below:

KTM – 2017-2021

65 SX 

Husqvarna– 2017 - 2021

TC 65

Gas Gas – 2020-

 MC65

Kit includes :

-ATS hard parts 

-Instruction

-Single spring 

Install tool required - INSTALL TOOL 

 Air to spring conversion to suit WP AER35 (ATS).   KTM-HSQ-GAS 50cc bikes

Install tool required also - Install Tool 

This ATS fork kit works in conjunction with the OEM single spring (RHS) / air (LHS) setup , transforming this forks action and returning it to a more conventional ‘dual’ spring fork.

The oem system is great for adjusting from soft to hard but simply has too much fork stiction ( due to the large Air piston)  and poor performance for the light weight 50 and 65cc racers.  Our spring conversion Eliminates the need to constantly check air pressure and returns the WP 35 fork back to a smooth operation as to be expected for light weight riders, improving turns, tyre grip and less front end wash outs.

Available with a single spring to match the oem rate with riders under 30kg.  

Fits: 50cc / E5 KTM, Husqvarna and Gas Gas as below:

KTM – 2017-2021

50 SX - SX-E 5

Husqvarna– 2017 - 2021

TC 50 

Gas Gas – 2020-

MC50 

 Kit includes :

-Air to spring hard parts

-Instruction 

-Single spring to match oem spring in RHS fork - (Note: OEM runs air LHS and spring RHS)

Install tool can be purchased from Catalog - tools - AER35 install tool  $39.95

Kits available for all WP AER and Xplor Forks.  KYB kits are ready to go with a B/Club level Offroad setting.

 Contact us now to inquire about a KYB cartridge kit pre set and valved specifically for you .  Rider weight, spring rate selected and valving settings installed at no cost prior to shipping.  Kits and Genuine Springs near always in stock.

• Convert your WP AER48 forks into KYB AOS Spring Forks - 

• 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 -

• Every individual cartridge kit fitted will be setup here at krooztune to suit Australian rider condition and speed.

• Personal setting based on the riders weight and bike

This Kit Includes:

2 x Cylinder Assemblies

2x Compression Base Valve Assembly 

1 Set of billet axle Brackets

2 x Oil Lock / Hydraulic stop

1 x set of fork springs ( rated to weight / speed)

2 x Litre KYB oil 

Please call or email the shop to organise a pre booking to have this kit installed and setup exactly for your needs.  Please email krooztune@krooztune.com or thru contact page  for any inquiry