Lambretta Pato 125N scooter loses power and goes out

Hi together, I got a kind of gift from a 125 China scooter. Normally I ride a motorcycle and don’t know how to ride a scooter. After I’ve registered him and driven a little (several days) he stopped with a half empty tank on the track. So I refueled and drove on. (It seems to be too little pressure with less petrol). Now the distances within a few days have become very short, meanwhile he drives a few 100m and goes out again. M My thoughts: – Change spark plug – Change petrol filter – Check hoses – Ggf Clean/change petrol pump What do you think? I removed the helmet compartment and already had problems with the spark plug. They would have to sit there after all? (Cap I removed) How the hell do I get the cables? LG Dende