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Hi Shaun, I don’t think you really have a TT carb…… It sounds more like the usual Type 6, typically stamped 206/151R on the mounting flange, in which case the answer is that they all dribble petrol until the engine is running. This is because of the steep 38 degree mounting puts the petrol level above the primary airway. So many Scott carbs have been wrecked by new owners thinking their carbs were leaking and then taking a large ring spanner to the bottom banjo bolt to try and stop the “leak”. Cheers. Brian.