Hey guys first time post. Unfortunately having some trouble, I'll try make it clear and short and would love some help

Come back from 2 month holiday bike running fine when left and now:
Bike starts fine when cold runs for a few minutes at about 3k. Revs fine but as the choke eases off the bike begins to struggle and I can rev it to be keep it alive for an extra minute but then the tacho needles and neutral light start to spasm and flash and it dies soon after and it will no longer start(or even turn over) until it cools down enough for the choke to engage again. Neutral light stays off regardless of gear position.

Thankyou so much if you could provide help