YZ 85/65 High-Low Compression Adjuster

Krooztune High-Speed Compression Adjuster – Yamaha YZ65 / YZ85

Krooztune is proud to be the only manufacturer worldwide offering a true high-speed compression adjuster for the KYB rear shocks on the Yamaha YZ65 and YZ85. While senior Yamaha motocross models like the YZF range come standard with high/low speed compression separation, the mini bikes have been left behind—until now.

Our precision-engineered high-speed adjuster brings pro-level shock tuning to the minis, giving serious racers the ability to fine-tune their rear suspension just like the big bikes.

Key Features:

• True High-Speed Compression Adjustment via external 12mm hex – adds or reduces preload to the compression shim stack, allowing control over how the shock handles high-speed hits like braking bumps, sharp square edges, and jump landings.
• Improved Shock Action straight out of the box – the internal design significantly reduces high-speed spike for a smoother, more controlled ride.
• Retains Stock Low-Speed Compression Adjustability – fine-tune your chassis behavior mid-corner or under acceleration using the standard slot screw ‘clicks’.
• Direct Bolt-On Upgrade for KYB Yamaha Mini Shocks – no permanent mods needed.
• NOTE : Due to the space constraints this unit must be adjusted form full Out.  Wind adjuster full off, and then set the spring preload by turns.  We start at 2.5 turns in, simple.  Too much adjustment will simply bind the spring eg. too m uch preload.  .5 to 4 turns is max adjustment.  

Why It Matters:

These mini bikes are often raced hard by aggressive young riders, yet they lack the advanced suspension adjustability seen in full-size motocross bikes. This adjuster bridges the gap, giving mini racers a real advantage in control, comfort, and consistency over race distance.

Whether you're chasing lap times or championships, this is a must-have upgrade for any serious YZ65 or YZ85 setup.