This 70.0mm centre universal bone is intended for the rear side of the centre drive on the YZ-4SF chassis. Manufactured from a 70-75 hardness aluminium alloy, the component reduces rotating mass compared with standard steel items and can improve the feel of throttle inputs while easing drivetrain load during operation.
Fit this as the straightforward replacement for the centre universal on the specified chassis; it has been dimensioned for the centre drive location and is intended to install without changing drivetrain geometry. Always check component clearances, correct fastener torque, and driveshaft alignment after installation to avoid premature wear in adjacent drivetrain parts.
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