Yokomo Z4-BTS Tensioner Set compatible with YZ-4  [Z4-BTS]

Low-profile belt tensioner for precise idler positioning

This Z4-BTS belt tensioner set is designed to help YZ-4 owners manage belt tension while giving precise control over idler position. The aluminum holder is machined with a beveled edge to limit interference within the transmission housing.

The package contains two screws with distinct offsets so you can select the correct bearing placement for front or rear mounting, and a spacer to nudge the bearing location as needed. Always fit the screw keyed to the chosen axle position and re-check belt tension after adjustment to avoid slippage or excessive preload.

Fitting is intended for hobbyists comfortable with basic RC maintenance: remove the stock idler, secure the aluminum holder, install the screw for front or rear offset, add the spacer if required, and run a short check to confirm alignment. This component is a tuning aid and does not alter the core drivetrain geometry.

Compatibility

• Supported Chassis B-YZ4