Yokomo B9-S116A BD9 High Bore Short Shock 6-Hole Upgrade Piston  [B9-S116A]

B9-S116A piston from Yokomo for sharper BD9 shock control

The Yokomo B9-S116A piston was developed alongside AXON for BD9 high big bore short shocks. The six-hole arrangement increases vibration absorption and traction. A larger outer diameter helps control body roll and reduces rear instability at higher cornering speeds.

Tuning tips and comparative notes

Relative to the original 4-hole BD9 pistons, the B9-S116A uses larger hole diameters to deliver a livelier response. Install with your standard shock oil first, then test heavier weights between #50 and #100 to dial in the setup for track surface and handling goals.