Mugen MRX5 Super Hard Clutch Spring by Arrowmax AM-MRX5-H0767  [AM-MRX5-H0767]

Super hard clutch spring for MRX-5

This clutch spring is the Arrowmax AM-MRX5-H0767 item intended for use with Mugen MRX-5 clutch assemblies. It is specified as a super hard spring made from spring steel and is presented as a direct replacement or tuning option where a higher spring rate is required.

Installation is the same basic procedure used for most RC clutch springs: remove the clutch bell and shoes as required, replace the existing spring with this unit, and reassemble while verifying free play and engagement. No special tools are required beyond standard RC maintenance tools; check clutch shoe alignment and bell runout after changeover to ensure consistent engagement.

Tuning role: a super hard spring increases clutch preload and raises the engagement threshold compared with softer springs, so it is typically selected when a firmer engagement or reduced clutch slip is desired under higher load or specific traction conditions. When fitting a stiffer spring, re-evaluate clutch shoe thickness and bell condition as part of the setup process to keep engagement consistent.