Yokomo B9-RBTSA Centre Bulk Belt Stabiliser for BD9  [B9-RBTSA]

Purpose-built belt stabiliser for BD9 chassis

The Yokomo B9-RBTSA rear belt tensioner is made for BD9-style touring cars and mounts on the centre bulk to keep the rear belt running true. It combats the belt oscillation that can lead to tooth skipping, maintaining steady engagement under throttle and during direction changes.

Compatibility is limited to the models shown below; the device mounts to the centre bulk area and functions by guiding the belt angle and holding tension locally without modifying belt length or fundamental drivetrain layout. Because it targets the belt run, the tensioner reduces intermittent backlash and improves drive consistency.

Fitting and setup are straightforward: secure the tensioner so the roller or contact point follows the belt line, confirm there is no interference with nearby components, then run static checks and low-speed trials to verify alignment. Minor adjustments to the unit position will remove slack or prevent over-tightening—monitor belt condition after initial use and re-check periodically.

Use this part as a tuning and maintenance aid to stabilise belt behaviour on BD9 platforms.

Compatible Models

• MRTC-BD919
• MRTC-BD919S