Junior Motocross

Billet Machined Swingarm ends to suit all model YZ65cc racers.  These are ready to custom weld / fabricate into the existing oem swing arm resulting in a professional job. This mod extends the swing arm 30mm. 

-The axle at full forward in our end piece matches the full back position on the oem unit.   

We can install these in house here in our engineering dept and alloy weld on our swing arm jig for a very neat professional finish.  These arms modified are $695 inc parts. 

We do have a near new changeover unit for customers with New or close to new swing arms. We do not change over worn or damaged units. 

 

Fits Yamaha YZ65 2018-2021 Models

Both our 'Fork upgrade kit' and 'Shock upgrade kit' combined into a cost-effective complete suspension upgrade.  

A smoother fork action with great hold up is achieved in the front end resulting in more grip, faster turns and a settled fork.  The shock all new setup free’s up this hard 'dead' like oem action into a bike with more drive, more bump absorption and a stable rear end through rough choppy conditions.

This kit includes:

• Fork Spring Guides 
• Hydraulic Bottoming System
• 17mm Face Compression piston
• Mid valve shim stack setting including Shims
• Base compression Setting including Shims
• High and Low speed compression adjuster
• Main piston assembly and shim setting
• High volume gas bladder cap
• Fast adjust alloy lockring
• Specification with 3 levels of setup A/pro, B and C level racers. Rebound info to match spring rates is also included
• Decal set 

For more detail on this kit please look at each kit individually:

• Yamaha YZ65 Fork Upgrade Kit
• Yamaha Fork and Shock Suspension Upgrade Kit

KYB YZ65 Fork Extension Kit.  Shorter Top out springs matched with custom billet longer caps allowing the increase in fork overall length with the benefit of added suspension travel.  +26mm over the OEM setup.

Kit Inlcudes Fork Cap and top out springs

Fits Yamaha 65cc 2018-2021 Models

Our Yamaha fork upgrade kit brings this basic KYB fork up to speed with its EU rivals in KTM and Husqvarna.  The main issues we have found with the KYB mini fork in both 65 and 85 racers is the lack of parts internally. 

Poor spring guidance alongside a lack of a decent bottom out system results in a fork that rattles and bottoms harshly.  This poorly aligned setup matched to a basic shim setting leaves this fork behind in performance. 

Our upgrade kit addresses these issues and most importantly delivers a fork that is both plush in the hands of all speed mini racers and with great hold up for the faster pro mini racers.

 Kit includes

• Spring Guides
• Hydraulic Bottoming System
• 17mm Face Compression piston
• Mid valve shim stack setting including Shims
• Base compression Setting including Shims
• Rebound tuning shims
• Specification sheet to cover all setup options for various speed riders A/pro, B and C level mini racers

For a complete bike setup check out : 

Yamaha YZ65cc Fork and Shock Suspension Upgrade Kit

Fits Yamaha YZ65 2018-2021 Models

Our Yamaha 65 Shock upgrade kit is a complete upgrade kit ready to install into the mini KYB shock.  We have found the OEM unit to be both restrictive harsh and limited in trackside adjustment. 

The KROOZ Racing kit allows both High and Low compression adjustment matched to a complete ready to install piston assembly that is dyno tuned and track tested to deliver results. 

As the photo’s show this piston assembly includes:

• Main Shock Piston
• KYB genuine piston band and o-ring installed
• Shim stacks
• Base plate carrier
• Integrated top nut and plate for maximum thread strength.
• Piston kit designed to utilize 12mm ID shims for ease of tuning
• 3 setting options to best cover all speed of rider is supplied. C, B, A/pro racers are covered with this kit.

Our main piston uses custom shim carriers matched to a CNC machined top nut/plate to integrate the much more accessible 12mm ID shock shims.  This trick engineered top nut allows ‘full depth’ and more shaft thread being used, resulting in a super strong and accurate setup on the OEM shaft. (shock shaft not included)

The shocks new setup free’s up the hard ‘dead’ like oem action into a bike with more drive, more bump absorption and a stable rear end through rough, choppy conditions. Dyno and Track tested in slippery harsh conditions here in Australia.  All terrain tested, hardpack slick to deep loam sand.

 Shock Upgrade Kit includes:

• High and Low speed compression adjuster
• Main piston assembly and shim setting
• High volume gas bladder cap
• Fast adjust alloy lockring
• Specification including 3 levels of setup A/pro, B and C level racers.  Rebound settings are also included to match the spring rates required.

 *Shaft in pic for demonstration only

YZ 85 Performance Linkage 

Lower the high feeling in the rear without softening the spring rate or compression damping.  This linkage allows a flat feeling under heavy braking at speed and transforms these mini racers in the deep sand. 

Tuning Options: 

5,10,15,20 via our adjustable end buttons.  

Comes with 2 sets of end buttons to achieve all variants.

Billet Machined and tested here in Australia

Our Yamaha YZ  85 Performance Linkage is designed to use all OEM / standard bearings, bearing sleeves and seals. All bearings are pre-fitted to allow for trouble free fitting.  This kit will require the standard bearing sleeves and seals to be fitted from the std linkage.

Alloy Shock Collar lock ring to suit all YZ85 and YZ65 models. 

Fast lock up and adjustment with the 4mm hex bolt easily accessed and tensioned.  Barely a 1/4 turn of tension on the lock bolt will stop this lock ring turning,  allowing for fast adjustment track side .

We recommend 4-5N of tension only 

High Speed Compression adjustment for KYB Yamaha Mini shocks.  This transforms the shock action , improving high speed spike straight away due to its internal design but also allowing further tuning by adding or reducing spring preload to the shim stack via our external 12mm Hex adjuster.  Low speed comp remains the same, slot screw adjustment in 'clicks'.   A must to upgrade these shocks for the serious mini racer .

Great value upgrade kit for the YZ85 Shock. High/low Compression adjuster and the fast adjust Shock Collar. Combined with the right valving setup and shock spring we have the rear of this mini sorted.

• High/Low Compression Adjuster
• Fast Adjust Shock Collar