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What do the power valves on a KTM 125SX do?

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Anonymous

∙ 16y ago
Updated: 12/15/2022

The powervalve is a quarter moon shaped plate that rests on the top of the exhaust port. when the engine hits a certain rpm the plate slides back which advances the port timing. Advanced port timing yeilds more top end power, and retarded timing (later timing) gives better bottom end power.

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Wiki User

∙ 16y ago
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