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78 vacuum lines.

  • Thread starter Thread starter Coldeye_
  • Start date Start date
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Coldeye_

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Hey guys, I am new to the forum, but not new to bikes.

I am in desperate need of a vacuum line routing diagram or explanation of routing the vacumm lines on my 78 GS 1000. The project I bought had no air box. Only K&N pod filters. Of course the carbs were off when I got it and it just had 2 lines on them. I believe the sides of the vm carbs are overflow and the bigger brass outlets are for vacumm. I only see three spouts though. If these are coreect were do they run to. The petcock also has a fuel spout and a smaller spout I suspect to be a vacumm. Then there is the sending unit spout. Got the sled running today without any lines other than a fuel line connected and she is running rough, rideable, but rough. My fuel supply tubes between the carbs are leaking badly. Will o rings cure this or am I on the hunt for a needle in the haystack small fortune part. Thanks for any help!
 
You should have outlet nipples on your #2, #3, and #4 VM series carbs.

#2 and #4 vent to air. #3 is your vacuum outlet that hooks up to your smaller outlet on your petcock. The big "T" on the bottom is for fuel.

My T's are plastic and don't have O-rings, I don't think yours do either. You can get new ones still I think, and there are a couple of creative ways to deal with that problem. I'm off to work and can't look it up right now, but there are fixes available for that.
 
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Thanks for the help Mark. I will try and find find a fuel Tee fix using the search thread.

Mike
 
The plastic, or rubber coated Tee Mark describes should have raised bumps that act as o-rings. Good luck finding a oem replacement. That tee is obsolete. I was lucky to have a spare rack of carbs. If you don't, you can pick up a brass replacement tee here. http://www.motorcyclecarbs.com. Lots of other carb goodies, too.
 
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