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Since it is a 2 stroke, you need to keep revving it every few seconds even when sitting still or in idle or the engine will shut off. It might also be because you need a new spark plug. It is located directly under the gas tank on the egine. Try pushing down the plastic cap on the plug, and if that doesn't work, just buy a new one for about $5.00

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13y ago
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Q: Why is your KX 125 bogging down?
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