This 70.0mm center universal bone suits the rear side of the center drive on the YZ-4SF chassis. Crafted from a 70-75 hardness aluminum alloy, the part trims rotating mass versus steel originals and can contribute to a crisper throttle feel while easing drivetrain stress.
Use it as the specified replacement for the center universal on the listed chassis; it is sized for the center drive position and meant to fit in place of the factory component without changing drivetrain geometry. Always check for adequate clearance, correct fastener torque, and aligned driveshafts after installation to avoid accelerating wear elsewhere in the system.
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