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  • Clutch Springs Overview:

    Mugen Seiki MBX8R and MBX8TR Clutch Springs. These replacement clutch springs are intended for the MBX 1/8 nitro platforms to allow racers to fine tune the clutch to fit track conditions.

    Includes:

    • (4) Clutch Springs

    *Note: Stock Springs are (0.95mm)

    Effects of Clutch Spring Changes

    Spring

    Characteristic
    Softer

    • Clutch engages earlier at lower RPM
    • More gradual acceleration
    • Easier to drive but not as aggressive
    • Easier to drive on low-grip tracks
    Stiffer

    • Clutch engages later at higher RPM
    • More sudden acceleration
    • Car is more aggressive
    • Engine will perform better on high-grip tracks

    This product was added to our catalog on May 7, 2025

    • Mugen MBX8R
    • Mugen MBX8TR

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