50ccm Quad (Minarelli replica) goes on and off again

The day before yesterday I bought a used quad (Triton baja 50) , is installed: Stage 6 Sport Pro 2 21mm Black Edition Full-Force Turbo Kit Exhaust Rotating Gas Handle /Short stroke Polini Vario Stage 6 Sport Pro Clutch + Clutch Bell Hebo Manston We were there and he also did not use e starter on site, because the battery was almost empty. Although a new gel battery was installed, this is empty due to the service life. On site, however, the quad went with a kick. , short forwards and backwards drove short because we were on the road for quite a long time. Then we invited it and drove back. Arrived (about 3 hours later) , we unloaded it and I started it, with a kick it went on without problems. I drove a round around block, acceleration was rather not so bounced, did not run as the setup promises, but it drove. I turned it off at me, waited 2 days and wanted to turn a lap. I got the choke pure cht, kickt, it went on for a short time, but then it went off again. Even if I turn on the gas tap, it doesn’t help, it feels faster, after another kicking, it always does less, it goes off even faster. At the third time something I can kick, like an ox and it doesn’t do anything anymore. I wait a few seconds and kick it again, wants it back out as described before. Can it be because it’s because of the empty battery? I have to say it is currently also under 10°C…. Built is a manual choke. According to the seller, cylinder etc is new (not even properly retracted), engine was completely resealed etc