Ray Kit Pistons for WP 4CS 2013-2015 Dal Soggio

The Dal Soggio 1P.KIT RAY WP4CS RAY Kit is a high-performance internal suspension upgrade developed specifically for WP 4CS front forks from 2013 to 2015.

Rather than simply changing the original shim settings, the RAY Kit modifies the hydraulic architecture of the WP 4CS system to create a more effective and balanced damping arrangement.

After installation, both fork legs work together to pressurize the complete system, changing the behavior of the original WP 4CS fork and improving the way hydraulic forces are managed during compression and rebound.

The RAY concept separates the two primary damping functions by positioning compression control in the lower section and rebound control in the upper section of each fork leg.

This configuration allows a greater quantity of oil to move through the shim system. According to Dal Soggio, the RAY architecture effectively doubles oil flow, producing a more fluid fork response and improved front-end feel.

The system was designed for riders seeking a substantial WP 4CS performance upgrade while retaining the original front fork structure.

Dal Soggio indicates the RAY Kit as suitable for Enduro, Motocross, and other Off-Road disciplines, making it a versatile solution for different riding conditions and terrain types.

Key Features

• Developed specifically for WP 4CS front forks from model years 2013 to 2015
• Allows both fork legs to work together to pressurize and control the complete hydraulic system
• Separates compression damping in the lower section and rebound damping in the upper section of each fork leg
• Designed to double hydraulic oil flow through the shim system for smoother and more controlled suspension behavior
• Suitable for Enduro, Motocross, and other demanding Off-Road disciplines

Technical Specifications

Specification	Details
Manufacturer	Dal Soggio Race
Part Number / SKU	1P.KIT RAY WP4CS
Product Family	RAY Kit
Product Type	Front Fork Hydraulic / Piston Upgrade Kit
Fork Platform	WP 4CS
Version	2013-2015
Suspension Position	Front
Primary Disciplines	Enduro / Motocross / Off-Road
Compression Function	Lower section of each fork leg
Rebound Function	Upper section of each fork leg
Hydraulic Operation	Both fork legs work to pressurize the complete system
Oil Flow	Doubled through the shim system 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 fork caps
• 2 adjusters to increase spring preload

These components are designed to operate together as a complete hydraulic upgrade rather than as individual replacement parts.

How the RAY Kit Works

The RAY Kit modifies the original WP 4CS hydraulic system by reorganizing compression and rebound control inside both fork legs.

After installation:

• compression damping operates in the lower section of each leg;
• rebound damping operates in the upper section of each leg;
• both fork legs participate in pressurizing the system;
• hydraulic flow through the shim system increases significantly.

Dal Soggio describes this configuration as providing double oil flow, resulting in a more fluid fork response and improved front-wheel feedback.

The objective is to reduce the limitations of the standard WP 4CS layout while keeping the original fork structure.

Suspension Behavior

The RAY upgrade is designed to improve:

• initial fork sensitivity;
• hydraulic damping consistency;
• front-wheel feedback;
• comfort over rough terrain;
• control during larger suspension movements;
• overall suspension fluidity.

By allowing both legs to contribute to hydraulic control, the system is intended to produce a more balanced and natural fork response.

Materials and Construction

Dal Soggio specifies ERGAL 7075 T6 as the main material used for the RAY Kit, with selected components manufactured using Teflon.

These materials are chosen to combine mechanical strength, low weight, durability, and low-friction operation inside the suspension system.

Application & Compatibility

The 1P.KIT RAY WP4CS is intended for WP 4CS front forks from 2013 to 2015.

Dal Soggio identifies dedicated RAY configurations for:

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

The manufacturer also indicates that dedicated versions were produced for KTM and Husqvarna motorcycles originally equipped with WP 4CS forks.

Because internal fork specifications can differ between versions and years, the exact WP 4CS configuration should be verified before installation.

Installation Note

Installation requires full 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 setup, oil filling, bleeding, and final suspension adjustment are essential for proper operation.

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