Peugeot Speedake 50 goes out in warm condition

Hello, I have a problem with my Peugeot Speedake 50 BJ.1995. Namely, the engine starts after a longer drive (almost full throttle) about 15km, it only makes itself noticeable with power loss shortly afterwards it takes no more gas and you roll out in the end. The engine starts again after 5min standstill and the game starts from the front… I recently shot the scooter cheaply with a high service life about 10 months according to the seller. I already have a new Z When cleaning the carburettor I found out that a 58 main nozzle is installed. The exhaust no longer seems the original or one without throttle from the sound. The spark plug picture looked half-right, only the candle was completely dry if that should not be so? For every tip I would be very grateful