Topic: Carb venting

[Boy named Suzi]

....so....
  Have a '77 GS 750, have rebuilt the carbs and am looking for advise on how to vent the stubs. It has 4 carbs, 1 actuates the vacuum petcock and the 3 others are to be routed. The vents are also connected in pairs (2 each side of throttle linkage). Do the remaining stubs get ganged together to share/modulate inlet vacuum (this setup is how the bike arrived - non operational!), or as also suggegted, do the sit open and suck air? Why have hose stubs then?

Any advise appreciated, I know it's not 'technically' a SOHC, actually not a SOHC at all. It does qualify as an other, yea!
thom

[crazypj]

except for the vacuum line, the others should have rubber caps. Don't leave them open, runs real lean and will cause damage.

PJ

[Dawdlin Dog]

Don't know whether your carbs are the same as the 850 but this page helped me solve a problem I was having with my GS  http://members.dslextreme.com/users/storagecliff/images/hose_locations.html

[kirkn]

except for the vacuum line, the others should have rubber caps. Don't leave them open, runs real lean and will cause damage.

PJ

+1

one port runs the vacuum petcock.  other 3 get capped.  Except during carb synchronizing, when theoretically, you're using a temporary fuel set up and using all four ports for sync-ing.

[Boy named Suzi]

  Thanks all! Gonna try with long hoses. The manual shows hoses, and in the manuals pictures but no routing.

  Thanks Kirkin, was going to undo plugs in the intake manifold, these stubs are a more logical (it's about a bike so I don't use logic, much) place to connect the guages. Thats a job for the winter...

  Running right this weekend? Hope so!