Our new MB1 4CS performance kit includes new base valve pistons, compression base bolts, upper cartridge bleed and check plug and lower cartridge bleed plug. 

 

MB1 4CS Compression Base Bolts install at the bottom of the fork, providing much-needed adjustable fluid flow at the base valve (the OEM fork has no adjustment at the base valve). This allows us to disable WP's problematic check-controlled bleed system, and make both the compression and rebound adjustments to work properly. Our flow control design is unlike anything else available for 4CS - and it shows when you ride the fork.

 

 

MB! 4CS Base Valve pistons are used for the compression port geometry optimized for the 4CS fork's low-displacement 8mm damper rod.  This design provides improved sensitivity to sharp bumps and increased bottoming resistance.  They are machined from solid steel and ground for perfect flatness across the shim sealing surface.

 

 

MB1 Cartridge Bleed Plugs-The 4CS fork has large fixed bleed holes in the fork cartridge.  This design provides very little damping control for low-speed movements, and necessitates the use of compensating factors to keep the fork up in the stroke.  Those compensating factors make the fork harsh. Our system works by carefully controlling oil flow at low speeds, creating a hydraulic cushion to support the fork in motion. We use special inserts to close off the factory bleed orifices at both the upper and lower parts of the cartridge, allowing the compression adjuster to do its job.  

 

Call us today to schedule your appointment.  We can revalve your KTM forks and install the performance kit to fix the problems that you are experiencing with these forks.