The Kyosho UM774 Slipper Spring Set is a focused upgrade that improves the slipper mechanism on the RB7, delivering more consistent engagement and easier tuning. These springs help maintain steady clutch behaviour for repeatable performance on race day.
With the UM774 springs fitted, power is fed to the wheels in a more controlled manner, reducing sudden loss of traction and improving stability on corner exits. They are particularly useful when dialling in the car for close competition.
Install the Kyosho UM774 set following the RB7 assembly guidance and check that the slipper plates sit flush. Regular maintenance and timely replacement of fatigued springs will keep the slipper functioning reliably.
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