Hello It’s about a Speedfight 1 LC throttled (exhaust and variomatics) Stand a few years, disassembled everything cleaned then ran about 700km perfectly then at once it goes out at full gas or stutters no power. Carburettor cleaned and others always tries the same problem, with start pilot turns the then with full gas out so no fuel or false air Verbaut is a 52 HD with 12 carburettor original is a 50, carburettor needle one higher than center. According to dealer (Roller Händle r Peugeot since 1990) Simmerrings that I then had made with him and a new foot seal, engine I brought him. Still can not. Other exhaust has not changed anything. Various Choke always tries the same. Now new carburettor Repro with HD 60 and new membrane still the same problem. Jumps great at the beginning also on full gas when tires in the air but after some time it starts then also no start possible. When he then goes out with full throttle he jumps immediately again and runs nicely in idle mode. Have already built a filter in the petrol line everything clean and always full. Even without a tank plate tried because of ventilation also nothing changes. Could the original cylinder at 13,000 km be through even if it still looks good according to dealer? Normal I screw on old Vespas but that belongs to my son Thanks for your help