My question actually does not concern a classic car, but only a 17-year-old motorcycle. Since the corresponding motorcycle forum only deals with louder exhausts and power increases etc. (can?) I put it here. Ga server ice is finally a classic car theme: 4-cylinder in-line motor across the direction of travel, wind-cooled, 4 direct-pressure carburetor behind the engine, no gassing influence by any exhaust control equipment. The engine starts without problems with Choke at below 12°C and runs without any problems apart from normal cold running involuntaries. Above about 12°C you don’t even need a Choke to start. But if the temperature rises even higher (about 25°C) the following happens: Engine starts perfectly and runs the first half minute and then suddenly has total power loss. On the free track it caught itself after 100-200m again through more gas, in the city however it goes there nn off. Without Chocke he no longer jumps, with Chocke immediately, but turns up on a few thousand revolutions and still has no power. When Choke is pushed in he immediately goes out again. The external carburettors are ice cold in the area of the sliding tower. The two inner vmtl. also, only I don’t come to the feel. If you leave the engine then about 1min it runs after it perfectly. So all points out to Vergaservereisung. Only why does it occur only in the summer when is it really warm and not even in cool weather?