This centre universal bone measures 70.0mm and is intended for the rear side of the center drive on the YZ-4SF chassis. Machined from a 70-75 hardness aluminium alloy, the unit cuts rotating mass relative to steel counterparts and can help produce a more responsive throttle sensation while reducing drivetrain loading.
It is designed as a direct replacement at the center drive location for the specified chassis and should install without altering drivetrain geometry. After fitting, inspect clearances, torque fasteners correctly, and confirm driveshaft alignment to prevent premature wear in connected parts.
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