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if your KX 125 is a two stroke (which it most likely is. you can tell by the exhaust pipe coming from the motor. if it is huge, then it's a two stroke)

Two Stroke motors get their oil from the gas you put in the tank. the mix ratio tells how much oil is supposed to be mixed with what amount of gas. you do not check the oil in a two stroke. you just simply add it to the fuel every, i mean EVERY time you fill up.

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16y ago

What else can I help you with?