Rekluse RadiusCX 4.0 for Beta 250/300 2T

The Rekluse RadiusCX 4.0 Auto Clutch Kit (RMS-8902122) is a premier automatic clutch system engineered for 2022+ Beta 250 and 300 two-stroke motorcycles equipped with factory diaphragm-spring clutches. In technical hard enduro, slick rock gardens, and steep off-camber hill climbs, low-speed clutch modulation is critical. Conventional manual clutches demand constant finger modulation to prevent low-RPM flame-outs, generating severe forearm pump, rapid clutch pack overheating, and lever fade. When the rear wheel stops abruptly during obstacle impacts, standard setups instantly stall the engine.

The RadiusCX 4.0 eliminates stalling by pairing Rekluse’s latest EXP 4.0 centrifugal drive technology with their Core billet architecture and TorqDrive thin-friction disc package. The EXP 4.0 expanding disc incorporates an updated roller-wedge assembly that reduces internal friction by up to 98% compared to sliding-ramp designs, delivering smoother engagement off idle and direct mechanical connection under load. Complementing the EXP disc, the TorqDrive thin-friction pack fits additional friction plates into the basket, increasing total surface area to deliver higher torque capacity with zero slippage. The complete kit includes a hard-anodized billet inner hub, pressure plate, hard-anodized clutch cover, and an externally adjustable hydraulic slave cylinder that allows riders to fine-tune Free Play Gain trackside without opening the engine cases.

Features:

• EXP 4.0 Roller-Wedge Technology: Redesigned rolling pins replace sliding wedges, dropping internal friction by 98% to deliver instantaneous, smooth engagement and direct throttle-to-rear-wheel response.

• Anti-Stall Operation: Automatically disengages at engine idle to prevent flame-outs during hard braking, obstacle impacts, and technical low-speed maneuvers.

• TorqDrive Thin-Friction Pack: High-capacity friction discs expand total plate count within the OEM basket footprint, maximizing torque transfer and eliminating high-load slip.

• Core Billet Internals: CNC-machined 6061-T6 aluminum inner hub and pressure plate optimize oil circulation to reduce clutch operating temperatures under heavy enduro abuse.

• External Free Play Gain Adjustment: Includes a Rekluse billet adjustable slave cylinder that allows external tuning of clutch pack clearance with a hex wrench.

• Basket Sleeve Armor: Hardened steel basket sleeves slide over OEM aluminum basket tangs, eliminating disc-tab notching and extending basket life.

• Billet Hard-Anodized Clutch Cover: Includes a high-strength Rekluse billet outer clutch cover for increased impact deflection and oil volume over stock cast units.

• Full Manual Lever Override: Retains conventional, seamless clutch lever feel and manual modulation capability at all times.

• Made in the USA: Engineered, machined, and hand-assembled in Boise, Idaho.

What's in the Box:

• 1x Rekluse EXP 4.0 Centrifugal Expanding Friction Disc Assembly

• 1x EXP Spring Tuning Kit (Assorted Spring Rates for Custom Engagement Tuning)

• 1x Rekluse Core Billet Hard-Anodized Inner Hub

• 1x Rekluse Core Billet Pressure Plate

• 1x Full Rekluse TorqDrive Friction Disc & Steel Drive Plate Pack

• 1x Rekluse Billet Hard-Anodized Outer Clutch Cover

• 1x Rekluse Externally Adjustable Hydraulic Slave Cylinder Assembly

• 1x Set of Stainless Steel Basket Sleeves

• 1x Clutch Hardware & Fastener Pack

• 1x Detailed Installation & Hydraulic Setup Manual

Fitment:

• 2022–2027 – Beta 250 RR, 300 RR

• 2022–2027 – Beta 250 RR X-Pro, 300 RR X-Pro

• 2022–2027 – Beta 250 RR Race Edition, 300 RR Race Edition

• 2022–2027 – Beta 250 Xtrainer, 300 Xtrainer

• 2022-2027 – Beta 300 RX

Application & Fitment Notes:

• Target Engine Platform: Fits 2022–2026+ Beta 250cc and 300cc 2-stroke models featuring the factory diaphragm-spring clutch:

• Generation Incompatibility Warning: DoesNOT fit 2013–2021 Beta 250/300 2-stroke models. Pre-2022 models utilize a traditional coil-spring clutch design requiring Rekluse part number RMS-8902022.

• Clutch Basket Requirement: Installs directly into the stock OEM Beta clutch basket using the supplied protective tang sleeves.

• Hydraulic Fluid Compatibility: Operates with the fluid specified on your bike's clutch master cylinder reservoir cap (DOT 4 / DOT 5.1 on Brembo/Braktec factory systems). Do not cross-contaminate with mineral oil.

• Friction Disc Pre-Soak Requirement: Prior to assembly, submerge all Rekluse TorqDrive friction discs and the EXP 4.0 disc in clean transmission oil (such as Motorex Cross Power 4T or high-grade 10W-40/15W-50 wet-clutch oil) for a minimum of 20 minutes. Installing TorqDrive friction discs dry will cause premature friction pad glazing during the initial engine startup, permanently degrading torque transfer and inducing clutch drag.

   

• Setting Free Play Gain via the Adjustable Slave Cylinder: Setting correct Free Play Gain is essential for auto-clutch operation.

  1. Install the Rekluse adjustable slave cylinder with the adjustment bolt backed out.

  2. Thread the center adjustment screw in until you feel light mechanical contact with the clutch pushrod (the "zero-play" point).

  3. From zero play, turn the adjustment screw 1 full turn clockwise plus 2 ticks to establish baseline installed gap.

  4. Warm the motorcycle engine to operating temperature in neutral. With the engine idling, slip the included Rekluse rubber band around the right grip and onto the clutch lever to hold slight tension. Rev the engine sharply to 4,000–5,000 RPM. The clutch lever must retract inward approximately 1/8" (3 mm). If the lever does not move inward, increase the adjustment bolt clockwise. If it moves too far, back it out counter-clockwise.

   

• EXP 4.0 Spring Tuning for Hard Enduro vs. Motocross: The RadiusCX 4.0 includes different color-coded EXP springs that govern the engine RPM at which the clutch begins to engage.

  • Low-RPM Engagement (Silver / Blue Springs): Recommended for technical singletrack, extreme enduro, and trials-style terrain on 250/300 2-strokes. Engages just off idle to prevent wheel spin and provide immediate low-end tractor traction.

  • Medium-to-High RPM Engagement (Blue / Red Springs): Ideal for aggressive woods racing, GNCC, and motocross (such as on the 300 RX). Allows the engine to build more RPM and hit the meat of the two-stroke powerband before full lockup occurs.

   

• Basket Sleeve Fitment Check: When sliding the stainless steel basket sleeves over the OEM Beta clutch basket tangs, ensure every sleeve seats fully flush against the base of the basket. If a sleeve sits proud, the TorqDrive friction discs can catch on the top edge, causing clutch hang-up and incomplete disengagement. If your factory basket already exhibits deep notches from previous OEM plates, file the notches flat or replace the basket before installing the sleeves and Rekluse pack.

Part Number: RMS-8902122