B-MAX4 Tapered X-Shock Piston BM-S116TA for Yokomo  [BM-S116TA]

Modify damping bias with a tapered X-piston

This optional X-shock tapered piston is designed to change the damping balance between extension and compression by making one side of the piston tapered. The asymmetric profile gives tuners a simple mechanical way to bias shock behavior without changing oil viscosity or spring rates.

Correct orientation is key: install the tapered face upward on front shocks to boost front load transfer under deceleration, and fit the tapered face downward on rear shocks to help prevent sudden rear breakaway when the car rolls. The piston is drilled with six holes in a 1.1mm pattern; a 1.0mm alternative (BM-S106T?400) is referenced in the source.

Apply this piston as part of stepwise setup changes: replace one piston, evaluate lap feedback, and note which orientation delivers the handling correction you want. It is an RC-scale shock piston made for tuning tasks only.