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hi have a small problem . just replaced cylinder head and piston on my 350 sport rebuilt carbs . new inlet manifold an air filters bike starts first kick an revs like agooden but for the life of me cant get ticker below 2000 revs any advice or ideas would be greatly appreciated thanks

Have you checked the float heights, if they are too high, this can cause it to run rich?

As has been said quite often, are the slides in the right way round? (Cutaway towards air cleaner)
Easy mistake to make.