Moin together, I have an XLH 1200 XL 1, i.e. a Sportster XL 1200 C from the year March 2001. Verbated is an HD carburettor 08TA E016, 27076-95. It is an open air filter installed, the flap-nauspuff is in position “open” actually almost open. The standard low pressure petrol tap is replaced with a standard petrol tap, the unnecessary vacuum connection is closed, the tank is clean, the petrol sieve is permeable and clean, the petrol flow is at the withdrawn B enzin hose in “ON” and “Reserve” tested and flawless.The ventilation hole in the tank lid is free. The sportster starts with choke, has some misfires until it is warm. Then it runs between 20 and 40 km perfectly and then stops after some misfires. After about 30-60 min it starts again and then runs the next 20-40 km, where the game starts at the front. The misfires shortly before stopping indicate for me that it does not war with fuel. T. Guys, I’ve been screwing since 1980, I know if such an engine has a spark, fuel and air, then it’s running, maybe it’s running like a sack of potatoes, because it’s poorly set, but it’s running.Why is this thing running perfectly for 40 km and then suddenly no more fuel???I’m curious if someone comes up with something. Greetings from Bremen, Martin