05 yz250 ignition problems

I have a 2005 yz250 that wont spark unless you press the kill button. it will spark once the first time you press the button then no spark. Measured the entire ignition system according to the book and all values are correct. replaced CDI, coil, and stator, several plugs and replaced cap. ground block has all five wire solidly connected.

Im clueless? Any advice? thanks

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