The Yokomo S4-118BSA urethane battery spacer was engineered to fit the YZ-4S chassis and hold compact Li-po packs firmly in place. Its dense urethane construction helps prevent battery shift under hard cornering and on bumpy tracks.
When tuning a YZ-4S for competition, the Yokomo S4-118BSA fills the void left by shorter Li-po batteries to eliminate movement and preserve steady power delivery during race runs.
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