Hi, I drive a zip 50 2T Bj. 2015 with almost 12000km. After the last winter the scooter was rucking and did not really accept the gas. After I had read something, I cleaned the carburettor. This has already happened 2 times until now. The scooter still did not run satisfactorily. At the first expansion of the carburettor I ordered a new air filter (https://www.ebay.de/itm/353167521906?…) and built it up. Also that did not help, also I dealt with the carburettor one time. In addition, I found that the e-choke was broken. It was exchanged for a new one. I already tried different settings on the carburettor, not with the right result. Mostly the scooter stutters at half or full throttle, it almost stops at the mountain. Now my question: What can I do? What influence does the gas slide needle (I don’t know at the moment) have and must for example a new main nozzle through the air filter chsel (more open porous than the old standard filter) are installed? I am new to the topic and just want to deal with it, so my ignorance and my questions about it. Thank you for your help, LG Patrick