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My very early (9/76 build date) GS750 "pre-B" has a similar petcock, with both ports facing forward. One is an air port, not a fuel outlet. It pushes the internal diapraghm so fuel only flows in the "On" or "Res" positions while the engine is running. "Pri" flows fuel all the time and can indeed "overpower" the float needle on the #4 carb. I could not find a replacement petcock which allowed the backplate to be reinstalled...the one I have has the backplate as a (perhaps pressed in) permanent mounting. I use a 90 degree fitting on the fuel outlet hose to the carbs to compensate for this. But I have not been able to get the "On" position to feed fuel, though there does seem to be positive pressure from the smaller diameter hose. I also have not found a rebuild kit for the original petcock which works. All the supposed "correct" kits or petcocks I've looked at are not correct for the bike.
No I don't have one that is usable the the tube for the fuel hose is missing and it is frozen. I was referring to the old one from my 821100e. I ordered a kit k&L kit for it and will see if I can make it work. I have never tried to rebuild on before but I don't have much choice.
IMG_4033 by Gerald Kaiser, on Flickr
