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My first inclination is tell you that it is probably jetted too lean. The low speed jet should be a number 29.5 or a 31. The main should be a 72 in most cases. Your bike may require a step up or down from these jet sizes as I don't know what kind of exhaust or other modifications your bike has nor the location (altitude) you are at. This is a common complaint with the Super "B". The biggest reason for this is that the Super "B" carb did not have an accelerator pump on it. This means that when you rev the engine, you create a momentary lean condition before the vacuum signal can start to draw fuel from the main jet circuit. Go to S&S's site and download the installation instruction for your Super "B" carb, file 51-1006. Even though they have stopped production of this model, the instructions are still posted online. The Super "E" carburetor was designed to replace the "B" model. The "E" is called the "Shorty" because it is much shorter and does not stick out as far as the "B" model. It also has an accelerator pump that smoothes out the transisition between the idle-low speed circuit and the high speed circuit. Also, check your plugs, plug wires (especially the spark plug boots and the end that plugs into the coil) and the points. You may be getting a misfire or a weak spark.
Press on the FN + F1 key. It will show you instructions on how to use the webcam. If it does not come up then click on start>Control Panel>Display and the webcam instuctions will be available. Good luck.
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