I 've used 1 kb carb on the dyno, while it made good power it was lean and would not respond to jet changes as it should have.IF the carb will not idle check that it has a small hole drilled in each throttle blade.Turn the carb upside down and you will see a small slot by the blades.the slot goes up and you will have to open the blades to see it.Adjust the idle speed screws till you have about .040 of the slot showing below the blades.Check the ldle air bleed at the top of the carb(outside jets)they should be around ..070 ,smaller makes it richer.