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Hey guys, I've been working on a kasea 150cc buggy with gy6 engine. I was able to get it running for about 10 minutes, give it some gas, it gained rpm then cut off and I haven't had spark since then. I have replaced the cdi with no luck and have done testing with multimeter on parts. One thing that is weird, I get a spike of voltage from cdi to ignition coil at initial turnover then it drops in voltage and doesn't come back. Any ideas as to what might be happening, could it be another bad cdi? Please note that I was starting it before by jumping it with a battery charger.i have also replaced ignition coil.

Stator readings
Blue/white - .5v when cranking
Blue/white - 157ohms resistance to ground
Red/black - 84v when cranking
Red/black - 363ohms resistance to ground

To ignition coil
Initial turnover - 50v-100v
Then drops to - 3v-14v
Resistance across ignition coil - 1.2ohms

Any input would be great, I'm trying to not just throw parts at it in order to fix it.

I have also removed the cvt housing and replaced a bolt with ground wires on it, do you think it's possible that I am just not getting a proper ground? I have conductivity from block to ground post but not sure if it's solid enough for the system to create consistent proper voltage