I can tell from the price alone that is not the pumper version. It's dubbed the "pumper because it has a accelerator pump that give a shot of fuel at initial opening. The pumper can't be used with the stock head or exhaust. The carb flows aprox. 30% more fuel and air. you have to have a head and exhaust that handles the extra volume. That price on BD is about the best I have seen. They run about 75. for the OKO clone upward to 190. for the kehein
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