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Petcock issues

  • Thread starter Thread starter Suzuki_Don
  • Start date Start date
faafaafowhigh said:
My all stock GS750 has the "Dreaded 1980 Petcock" (nylon barrel screw no lever). After following the carb cleanup series to at "TEEEE" I still have fuel spitting back into my airbox. I will be purchasing a new petcock; however, i am unsure of which one to replace it with. Should I replace the dreaded one with the exact same dreaded OEM, or go to Z1 for their version of the dreaded one. I'm also curious what difference in materials if any between the two. Thank-you all in advance for your comments and advice.

I came to this diagnoise by switching petcock to prime and pinching off the vaccumm tube from petcock to carb #2.
Click to expand...

I am not sure fuel spitting back in the airbox is a symptom of a bad petcock. Sounds more like a high fuel level to me. Could be needles and seats or just incorrectly set floats.

If you are going to buy a new petcock I would get the one from Z1, but check first that it will fit. You need to know the distance centre to cente of the mounting bolts. Mine was 44mm. Some are 50mm. Also make sure the vacuum plate on the back of the tap does not foul the frame. I had to reverse the vacuum outlet so it faced forward instead of in reverse. Then as explained above had to lower the tap by 8mm using a spacer that I made up.

Mine was on a 550 frame and it could be the 750 frame is different in shape and will not cause these problems.
 
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