I don't want to throw you off your course on this, but I had similar issues recently on my 2014. This may or may not apply.
In the end what fixed it was tightening the CDI connector pins. I had to replace one that I squished too far accidently while trying to make the fit tighter. It produced some strange symptoms including intermittent spark.
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2021 Beta 300RR
2014 Gasgas XC300R
2019 850 Pro RMK
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