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39 keihin carb pumpers


gasmask34

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The needle is the same on both a pump and no pump PWK. The  seats are non-replaceable with the pumper having a smaller orifice. Like tricked said the inlets are different. Pumper style inlets point down. Not sure if it would always work but I knew of a guy who turned the inlets to point up with a crescent wrench and they didn't twist off or leak.

Personally I wouldn't try to "convert" them.  

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