Mugen MRX-5 Heavy Duty Clutch Spring - Arrowmax AM-MRX5-H0767  [AM-MRX5-H0767]

High-rate clutch spring tailored for MRX-5 use

Arrowmax AM-MRX5-H0767 is a super hard clutch spring produced from spring steel and supplied as an aftermarket replacement compatible with Mugen MRX-5 clutch assemblies when a higher spring rate is required.

Installation follows normal RC clutch service steps: remove the clutch bell and shoes as needed, swap the factory spring for this unit, then reassemble while checking free play and engagement. No specialist tools are necessary beyond common RC maintenance gear; inspect clutch shoe alignment and bell runout after fitting to ensure even engagement.

Tuning note: choosing a super hard spring increases clutch preload and raises the engagement threshold versus softer springs, so pick this option when you need firmer launches or less slip under heavier loads. After fitting a stiffer spring, recheck shoe thickness and bell condition as part of the setup to maintain consistent engagement behavior.