The Yokomo B9-S116A piston is a significant upgrade for BD9 high big bore short shocks, developed in collaboration with AXON. This piston features six holes, allowing for superior vibration absorption and improved traction. The increased outer diameter enhances stability during large rolls and prevents rear-end instability during high-speed cornering.
Compared to the standard 4-hole BD9 pistons, the B9-S116A offers a larger hole diameter, making it more responsive. It is recommended to initially use the standard shock oil number when replacing this piston. However, experimenting with harder oils, ranging from #50 to #100, may yield optimal results.
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