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

Super hard clutch spring compatible with MRX-5

The Arrowmax AM-MRX5-H0767 is a super hard clutch spring manufactured from spring steel and offered as an aftermarket replacement compatible with Mugen MRX-5 clutch assemblies where a higher spring rate is desired.

Fitting follows standard clutch maintenance: remove the clutch bell and shoes as required, replace the existing spring with this part, then reassemble while checking free play and engagement. No special tools are necessary beyond typical RC workshop tools; verify shoe alignment and bell runout after installation to ensure consistent engagement.

Tuning advice: selecting a super hard spring increases preload and raises the engagement threshold compared with softer springs, altering launch behavior and reducing slip under load. After installing a stiffer spring, re-evaluate shoe thickness and bell condition to keep engagement consistent across conditions.