RA299605 MALOSSI UPRATED CLUTCH SPRING KIT - 3 sets of 3
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On automatic motors the clutch often engages at low revs, which is often where the motor is not producing its best power, stronger spring will hold the clutch shoes in till the motor is revving a bit more, meaning there will be more power to pull away with.
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Malossi supply their springs in packs of 3 strengths, identified by different colours, all 3 colours are stronger than standard so you can set the motor to how you like it.