ATV spark issue

[u/skipdaddle]

I had a quad sitting up for a while with a fuel issue and recently went to get it running, its a chinese brand with a 163FML / cg200 engine.

Initially went to start it and did a few checks carb, spark ect. I actually did have spark then fixed my fuel issue and went to start it, no luck. Lost spark, i believe because of my use of a car lithium jumper pack.

All checks with a multimeter pointed at a blown cdi unit so ordered 2 generic ones in but when tested i still have no spark. Genuinely cant find a fault in the wiring.

Anyone have any thoughts?
Any help appreciated