[Bruce Edwards]

Olaf, when the carb butterfly gets past the idle air bleed slots it start to use the jets. So anything of fast idle will use the jets. The power system does not come in till the engine vacuum drops below the 6.5 of your power valve. Try going to a smaller jet it should help. I have set up lots of multiple carb engines and most are over jetted as the stock carb is set up as a single so they are jetted to take the whole load of the engine. If you are running two carbs you have to cut back on the jet size. Try it jets are cheap.