N nsxers New Member May 22, 2016 #1 Is there supposed to be a spring behind the pump diaphragm 99 gtx 46mm mikuni
S Sportster-2001-951C-Stock Well-Known Member May 22, 2016 #2 Yes, I'm quite sure. The spring "reloads" the accelerator pump as the throttle is released, this pulls fuel into the accelerator pump through the mushroom valve from the supply source (usually a nipple on the carburetor fuel chamber).
Yes, I'm quite sure. The spring "reloads" the accelerator pump as the throttle is released, this pulls fuel into the accelerator pump through the mushroom valve from the supply source (usually a nipple on the carburetor fuel chamber).
