Motocross

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

Krooztune Adult and kids T Shirts. 

Available in Petrol Blue, Black and Red

Kids sizes run :

6year, 10year, and Adult Small 

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   

Fits:

• KTM Xplor Shocks - ALL

Our Gas Bladder kit Converts your WP XPLOR shock to a Bladder nitrogen system allowing the shock to perform at a high 'Factory' Level.  The Oem Unit in these WP shocks have a floating piston standard that separates the oil and gas from mixing.  The issue with this while it is cheap to produce, generates heat and friction as the piston moves up and down along with the shocks movement when hitting bumps. 

We find a much better feeling and performance from this shock when it is changed to bladder system as found on the Factory WP Trax shock and all Japanese Showa/KYB units.  Making an already great WP shock better.

All Kits are Billet machined and supplied with Genuine KYB bladders internally for a high quality, ease of ordering spares and reassurance.  

Kit includes:

• Bladder Housing
• Circlip
• End cap ( nitrogen needle filled)
• Hex Screw for an extra backup gas Seal 

Complete Front and Rear Suspension setup kit to suit the Yamaha YZ65cc Racer.

Fits Yamaha YZ65 2018-2021 Models

This kit includes:

Fork Parts

• Spring Guides 
• Hydraulic Bottoming System
• 17mm Face Compression pistons and shims
• Mid valve shim stack setting including Shims

Shock Parts

• High and Low speed compression adjuster
• Main piston assembly and shim setting
• Fast adjust alloy lockring
• Specification with 3 levels of setup A/pro, B and C level racers.
• Decal set. 

KYB Fork kit Features-

A smoother fork action with great hold up is achieved in the front end resulting in more grip, faster turns and a much improved and settled fork.  This is achieved by adding our engineered Hydraulic bottom out and spring guidance system working alongside our kit fork parts to allow an exceptionally smooth and tuneable front end. 

• Better bottoming resistance
• More hold up at speed
• Smoother bump absorption
• Multiple fork settings to tune for rider ability and speed supplied.

KYB Shock Kit Features-

In the rear we use our complete bolt on shock piston and shim stack assembly to allow a super easy install.  Our track tested setting is already pre-arranged and ready to bolt on with our piston assembly.  To maximise strength and for a factory level finish, this piston kit comes with a billet CNC machined shaft nut, engineered for maximum thread coverage and security.

Complimenting the rear piston assembly our world first YZ65 ‘HIGH/LOW Speed’ compression adjuster brings the rear unit’s adjustability in line with senior YZ MX models.  Clicker and settings supplied.

Finished off in the rear end with our CNC Alloy machined Lock ring, you can tune rider sag trackside in seconds.   The result is a rear end that tracks and is more compliant than the firm wooden like OEM rear end.

• More drive
• Improved bump absorption
• Much more stability in the rear end through rough, choppy conditions.

This complete setup has been thoroughly track and suspension dyno tested and comes with multiple setup/shim options to suit rider weight, tracks and speed.  

Fits :

WR250/450F 2019-2021

YZ250F 2019-2021

YZ450F 2018-2021

Flow Adjustable Kit inlcudes:

• Blue Base Adjuster 
• Sealed Adjuster Drive Pin
• Adjustable post (LHS fork Install only)
• RHS Mid post 
• Spring cups
• Mid springs
• CNC Machined nuts
• Instruction Inc Advised setup

Non Flow Adjustable Kit Includes:

• 2 x Mid Posts
• Spring cups
• Springs
• Instruction Inc Advised setup 

High Flow Compression Piston to suit KYB 50mm and 46mm body modern era shocks.  Developed to reduce high speed spikes without having to dramatically alter the high speed compression valving to improve this situation. 

Retains all OEM seals, post, check valve and shim stacks. 

Fits all 2016-2020 Model Bikes Listed

•  YZF250/450 
• YZ250 2 Stroke
• WR Offroad range 

**May fit alot more of the older model bikes also. Please check via Genuine part number comparison 

Fits: 2018-2022 YZ450F / 2019-2022 YZ250F

Adjustable end Button resulting in 1,2,3,4 mm longer than OEM.  Most cases we are using 1mm option (pre fitted) for best outcome in performance. Lowers the rear and sits flatter under big braking bumps.  A must have in rough sand.   

As used and tested by Monster Energy CDR Yamaha Racing 

Includes 2 Buttons that are can be flipped around to achieve the result below.

Button 1 Fitted - 1mm and 4mm option (Number 1 to Rear of linkage =1mm)

Button 2 Fitted - 2mm and 3mm option (Number 2 to Rear of linkage =2mm)

Instruction Provided

Fits 2018-2020 Model Suzuki RMZ450

Krooztune’s Brand New Adjustable Performance Linkage Arms are CNC-machined from billet aluminum and are designed to stiffen up the initial linkage curve and improve the geometry of the chassis. This results in a much more stable ride at high speed and during bumpy corner entry.

Having a ‘high rear end feel’ whilst riding this bike gives the bike tremendous turn in for tight slow corners but takes away greatly the high speed stability and stable nature needed for fast sweeping bumpy turns. This all new linkage design allows you to test different lowering / Linkage arm lengths with the use of clip in / clip out buttons on the end of the arm. This gives you greater tunability to get this exactly how you like it. All settings pre tested and in instructions. Each linkage will be supplied with 4 buttons giving you 4 different length options.

Adjustable end Button resulting in 1,2,3,4 mm longer than OEM.  Most cases we are using 1mm option (pre fitted) for best outcome in performance. Lowers the rear and sits flatter under big braking bumps.  We had excellent results with juniors and sand specialists with this linkage. 

Includes 2 Buttons that are can be flipped around to achieve the result below.

Button 1 Fitted - 1mm and 4mm option (Number 1 to Rear of linkage =1mm)

Button 2 Fitted - 2mm and 3mm option (Number 2 to Rear of linkage =2mm)

Instruction Provided 

Our Showa TAC Air to Spring Fork Conversion Kit is a complete replacement cartridge assembly for your current SHOWA TAC AIR Fork setup.  It is designed to completely remove all the Air system from your current Showa TAC 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 or let us know your weight and speed  and we will recommend the best spring for you.

Kit Available for below models only 

SUZUKI RMZ450      2015-2017

KAWASAKI KXF450  2015-2017

HONDA CRF250R    2015-2017 (Not 450)

Spring Rate Recommendation

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 0.92kg/mm category but may well be better suited to a 0.96kg 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    

250F and 2 Strokes

450F  

 Parts included in the kit

• Fully Complete Cartridge assembly
• Alloy Bottoming Cone and Acedal Spring Seat
• Optional Eibach spring to suit this kit

Key Features

• Never have to set your air pressure ever again
• Much more reliable fork
• 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.   

Kawasaki KX Performance Linkage

Adjustable end Button resulting in 1,2,3,4 mm longer than OEM.  Most cases we are using 1mm option (pre fitted) for best outcome in performance.  Lowers the rear and sits flatter under big braking bumps.  We had excellent results with light fast mx riders or shorter juniors with this linkage.   

Includes 2 Buttons that are can be flipped around to achieve the result below.

Button 1 Fitted - 1mm and 4mm option (Number 1 to Rear of linkage =1mm)

Button 2 Fitted - 2mm and 3mm option (Number 2 to Rear of linkage =2mm)

Instruction Provided

Honda CRF Large Volume Nitrogen Cap. 

Fits both the Honda CRF250R and CRF450R. 

Fitment years - 2018 thru to 2020 Models

Honda CRF Performance Linkage Pull Rod / Arms.

Fits 2017-2020 Honda CRF 

Adjustable end Button resulting in 1,2,3,4 mm longer than OEM.  Most cases we are using 1mm option (pre fitted) for best outcome in performance. Lowers the rear and sits flatter under big braking bumps.  We had excellent results with juniors and sand specialists with this linkage. 

Includes 2 Buttons that are can be flipped around to achieve the result below.

Button 1 Fitted - 1mm and 4mm option (Number 1 to Rear of linkage =1mm)

Button 2 Fitted - 2mm and 3mm option (Number 2 to Rear of linkage =2mm)

Instruction Provided 

Adjustable Lowering Linkage Designed to lower your Kawasaki KX450 -25mm or back to OEM height (0mm)

Optional Button Kit to adjust to -10/15mm lower is available - $249.95

Fits:

Kawasaki

KX450 2019-2020 

KX250 21 

Linkage includes Pre Installed Bearings for ease of fitment.  Seals and Bearing pin will need to be swapped across from the OEM linkage at time of install.  

Instruction included

Designed and CNC Machined at Krooztune HQ here in Australia.

Machined from 6061 Alloy specifically sourced from NZ and USA. 

Made in Australia

All New Shrader Valve Gas filled!

Fits:

• KTM Xplor Shocks - ALL
• KTM SX85 2018-2020
• HUSQVARNA TC85 2018-2020

Our Gas Bladder kit Converts your WP XPLOR or WP85cc shock to a Bladder nitrogen system allowing the shock to perform at a high 'Factory' Level.  The Oem Unit in these WP shocks have a floating piston standard that separates the oil and gas from mixing.  The issue with this while it is cheap to produce, generates heat and friction as the piston moves up and down along with the shocks movement when hitting bumps. 

We find a much better feeling and performance from this shock when it is changed to bladder system as found on the Factory WP Trax shock and all Japanese Showa/KYB units.  Making an already great WP shock better.

All Kits are Billet machined and supplied with Genuine KYB bladders internally for a high quality, ease of ordering spares and reassurance.  Parts and Bladders near always in stock here.

Complete Front and Rear Suspension setup kit to suit the Yamaha YZ85cc Racer.

Fits Yamaha YZ85 2012-2021 Models

This kit includes:

Fork Parts

• Spring Guides 
• Hydraulic Bottoming System
• 17mm Face Compression pistons and shims
• Mid valve shim stack setting including Shims

Shock Parts

• High and Low speed compression adjuster
• Main piston assembly and shim setting
• Fast adjust alloy lockring
• Specification with 3 levels of setup A/pro, B and C level racers.
• Decal set. 

KYB Fork kit Features-

A smoother fork action with great hold up is achieved in the front end resulting in more grip, faster turns and a much improved and settled fork.  This is achieved by adding our engineered Hydraulic bottom out and spring guidance system working alongside our kit fork parts to allow an exceptionally smooth and tuneable front end. 

• Better bottoming resistance
• More hold up at speed
• Smoother bump absorption
• Multiple fork settings to tune for rider ability and speed supplied.

KYB Shock Kit Features-

In the rear we use our complete bolt on shock piston and shim stack assembly to allow a super easy install.  Our track tested setting is already pre-arranged and ready to bolt on with our piston assembly.  To maximise strength and for a factory level finish, this piston kit comes with a billet CNC machined shaft nut, engineered for maximum thread coverage and security.

Complimenting the rear piston assembly our world first YZ65 ‘HIGH/LOW Speed’ compression adjuster brings the rear unit’s adjustability in line with senior YZ MX models.  Clicker and settings supplied.

Finished off in the rear end with our CNC Alloy machined Lock ring, you can tune rider sag trackside in seconds.   The result is a rear end that tracks and is more compliant than the firm wooden like OEM rear end.

• More drive
• Improved bump absorption
• Much more stability in the rear end through rough, choppy conditions.

This complete setup has been thoroughly track and suspension dyno tested and comes with multiple setup/shim options to suit rider weight, tracks and speed.  

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  

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.

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

Adjustable performance Linkage

Fits - Honda CRF450R 2021- Models 

Kit Includes:

• 2 x CRF450R Performance Linkage arms pre fitted with bearings and set to 0.5mm Option
• Optional 1mm interchangeable end buttons

Options included - 0.5mm (fitted) and 1mm interchangeable end buttons.  Resulting in +.5 or 1mm longer overall linkage pull arm lengths.  Our adjustable end buttons simply tap out and gently press in for an accurate setup.

Our adjustable linkage for the Honda CRF450R includes changeable rear end buttons allowing custom tuning of the 21/22 era Honda chassis to suit better rider balance.  Improved action under heavy breaking and more high-speed stability is achieved by lowering the rear slightly (as opposed to running excess suspension sag).  Utilising the linkage (either .5 or 1mm setting) in sandy conditions transforms the ride, reducing excess steer and allowing easier flow through fast whooped out turns.

We recommend our best tested 0.5mm button setting for most riders.  Using the 1mm button we have achieved great results with shorter riders and more stability especially in the deep sand conditions. 

Riders that like that low end flatter bike feel, less rise in the rear under braking and sand specialists will suit this performance linkage arm. 

Designed and manufactured in Australia sourcing the best alloy from New Zealand and the USA.

Designed to lower your Suzuki RM125 and RM250 10mm

Fits:

Suzuki RM125 RM250 1996-2000

Instruction included

Designed and CNC Machined at Krooztune HQ here in Australia by Qualified Engineers and Suspension Professionals.   Machined from 6061 Alloy specifically sourced from NZ and USA. 

Made in Australia  

2018-20 Honda CRF250R Manual cam chain tensioner

Set by experienced engine builder only.

Qty prices available for dealer inquiry