For model owners aiming to sharpen suspension control, the Yokomo B9-S4C2A set upgrades the BD9 shock top end. It includes precision adjustment nuts plus O-rings and caps to secure the assembly and limit oil loss.
The O-rings and caps work with the nuts to keep the shock seal intact and reduce the chance of leaks during long sessions. That stability helps keep handling predictable across multiple heats.
Specifically intended for the BD9 chassis and fitting the MRTC-BD10FF as noted, this kit suits both indoor and outdoor track use when you need dependable shock performance.
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