RAY Pistons Kit for WP 4CS 2016 Cross Dal Soggio

The Dal Soggio 1P.KIT RAY 2016 CR RAY Kit is a high-performance internal upgrade developed specifically for WP 4CS front forks used in 2016 Cross/Motocross applications.

The RAY system was created to substantially change the way the original WP 4CS fork operates rather than simply altering the standard shim settings.

Once installed, the kit reorganizes the internal damping functions by positioning compression control in the lower section and rebound control in the upper section of each fork leg.

This revised architecture allows both fork legs to contribute more effectively to hydraulic damping and significantly changes oil management inside the WP 4CS system.

A key feature of the RAY concept is the increase in hydraulic flow through the shim system. According to Dal Soggio, the kit doubles shim oil flow, allowing the suspension to react in a more natural and controlled manner.

The objective is to improve fork sensitivity, damping precision, comfort, and rider feedback while retaining the original WP 4CS fork assembly.

The RAY Kit is designed for riders who want a substantial improvement in their original suspension without replacing the complete fork or installing a full cartridge system.

Key Features

• Developed specifically for 2016 WP 4CS Cross/Motocross front fork applications
• Separates compression damping in the lower section and rebound damping in the upper section of each fork leg
• Doubles shim oil flow compared with the original WP 4CS hydraulic arrangement
• Includes dedicated compression units, rebound-calibrated pins, compression clickers, and spring preload adjusters
• Designed to improve fork sensitivity, damping accuracy, comfort, and overall front-end control

Technical Specifications

Specification	Details
Manufacturer	Dal Soggio Race
Part Number / SKU	1P.KIT RAY 2016 CR
Product Family	RAY Kit
Product Type	Front Fork Hydraulic / Piston Upgrade Kit
Fork Platform	WP 4CS
Version	2016 Cross / MX
Suspension Position	Front
Compression Function	Lower section of each fork leg
Rebound Function	Upper section of each fork leg
Shim Oil Flow	Doubled according to Dal Soggio
Installation Type	Internal retrofit
Professional Installation	Recommended

Kit Contents

The RAY Kit includes:

• 2 assembled compression units
• 2 pins with rebound calibration
• 2 compression clickers for installation on the upper caps
• 2 adjusters to increase spring preload

These components work together as a complete hydraulic conversion rather than as isolated replacement parts.

How the RAY Kit Works

The original WP 4CS fork uses a particular four-chamber hydraulic architecture.

The RAY Kit modifies this architecture by reorganizing the damping functions inside both fork legs.

After installation:

• compression damping is managed in the lower portion of each leg;
• rebound damping is managed in the upper portion of each leg;
• both fork legs participate more effectively in the damping process;
• shim oil flow is increased.

Dal Soggio states that this arrangement allows the fork to operate more naturally and with reduced friction, helping improve sensitivity and suspension response.

Suspension Behavior

The RAY system is designed to improve the behavior of the WP 4CS across varying terrain and riding speeds.

The intended benefits include:

• improved initial sensitivity;
• more accurate damping response;
• smoother reaction over small and square-edge impacts;
• improved front-wheel feedback;
• greater hydraulic support during larger suspension movements;
• improved rider comfort and control.

Application & Compatibility

The 1P.KIT RAY 2016 CR is intended specifically for 2016 WP 4CS Cross/Motocross applications.

Dal Soggio separates the RAY range into different versions for:

• WP 4CS 2013-2015;
• WP 4CS 2016;
• WP 4CS 2016 MX/Cross.

Because the internal configuration can differ between these versions, the correct RAY Kit must be selected according to the exact fork specification.

Installation Note

Installation requires disassembling both WP 4CS fork legs and fitting the complete RAY hydraulic conversion components.

Correct assembly, shim configuration, oil filling, bleeding, compression-clicker installation, preload adjustment, and final suspension setup are essential for proper operation.

Dal Soggio recommends installation and setup by a qualified suspension technician or authorized specialist.