Yokomo B9-RBTSA Rear Belt Tensioner Set for BD9 Chassis  [B9-RBTSA]

Overview: rear belt control for BD9

The Yokomo B9-RBTSA rear belt tensioner is crafted for BD9-style touring car drivetrains, mounting on the centre bulk to stabilise the rear belt line. It reduces the belt oscillation that can cause tooth skipping, helping the belt maintain engagement during both acceleration and steering inputs.

Fitment is restricted to the models listed below; the device fixes to the centre bulk area and operates by holding a controlled belt angle and local tension rather than changing belt length or altering core drivetrain geometry. Because it interacts directly with the belt run, the tensioner assists in reducing intermittent drivetrain backlash that can produce skipped teeth under load.

Installation is uncomplicated: install the tensioner so the roller or contact surface follows the belt route, confirm there is no contact with nearby parts, and then perform static and low-speed dynamic checks to verify correct tracking. Minor adjustments to the unit position will address slack or over-tensioning—monitor belt wear and drivetrain response after test sessions and re-check periodically.

Use this part as a tuning and maintenance item for BD9 touring car drivetrains.

Compatible Models

• MRTC-BD919
• MRTC-BD919S