Ray Kit Pistons for WP 4CS 2016 Dal Soggio

The Dal Soggio 1P.KIT RAY 2016 RAY Kit is a high-performance internal suspension upgrade developed specifically for 2016 WP 4CS front forks.

The RAY system is designed to significantly change the way the original WP 4CS hydraulic system operates rather than simply modifying the stock 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 hydraulic layout allows both fork legs to contribute more effectively to damping control and changes the way oil flows through the WP 4CS system.

One of the main characteristics of the RAY concept is the increase in hydraulic flow through the shim stacks. According to Dal Soggio, the system doubles shim oil flow, helping the fork react more naturally and with reduced internal friction.

The objective is to improve sensitivity, damping consistency, rider feedback, comfort, and front-end control while retaining the original WP 4CS fork assembly.

Dal Soggio developed the RAY Kit not only for experienced and professional riders, but also for riders looking to obtain a more natural and controlled feel from the WP 4CS platform.

Key Features

• Developed specifically for 2016 WP 4CS front fork applications
• Separates compression damping in the lower section and rebound damping in the upper section of each fork leg
• Doubles hydraulic oil flow through the shim system compared with the original WP 4CS configuration
• Complete kit includes compression units, rebound-calibrated pins, upper compression clickers, and spring preload adjusters
• Internal components use high-quality materials including ERGAL 7075 T6, with selected parts incorporating Teflon

Technical Specifications

Specification	Details
Manufacturer	Dal Soggio Race
Part Number / SKU	1P.KIT RAY 2016
Product Family	RAY Kit
Product Type	Front Fork Hydraulic / Piston Upgrade Kit
Fork Platform	WP 4CS
Version	2016
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
Main Material	ERGAL 7075 T6
Additional Material	Selected parts in Teflon
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 are designed to operate together as a complete hydraulic conversion for the WP 4CS system.

How the RAY Kit Works

The RAY Kit changes the original WP 4CS damping architecture by separating the two main hydraulic functions within each fork leg.

After installation:

• compression damping operates in the lower section of each leg;
• rebound damping operates in the upper section of each leg;
• hydraulic oil flow through the shim system is increased;
• both fork legs participate more effectively in suspension control.

Dal Soggio states that this arrangement doubles oil flow through the shim system, helping the fork operate more freely and with improved feedback.

The revised architecture is designed to make suspension behavior more natural while reducing internal resistance and improving damping control.

Suspension Behavior

The RAY system is designed to improve several aspects of WP 4CS fork behavior, including:

• initial sensitivity;
• hydraulic damping consistency;
• front-wheel feedback;
• comfort over repeated impacts;
• control during larger suspension movements;
• overall confidence and predictability.

Rather than replacing the complete fork, the RAY Kit modifies the internal hydraulic system while retaining the original WP 4CS structure.

Materials and Construction

Dal Soggio specifies the use of ERGAL 7075 T6 for RAY Kit components, with some parts manufactured using Teflon.

The use of these materials is intended to provide a combination of low weight, mechanical strength, low-friction operation, and durability within the suspension environment.

Application & Compatibility

The 1P.KIT RAY 2016 is intended specifically for WP 4CS front forks in the 2016 configuration.

Dal Soggio distinguishes three RAY versions:

• RAY Kit 2013-2015;
• RAY Kit 2016;
• RAY Kit 2016 MX / Cross.

Because these versions correspond to different WP 4CS configurations, the correct kit must be selected according to the exact fork specification.

Installation Note

Installation requires complete disassembly and servicing of both WP 4CS fork legs, followed by installation of the RAY hydraulic components.

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

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