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VM carb assembly question

  • Thread starter Thread starter FLHGSRay
  • Start date Start date
F

FLHGSRay

Guest
Doing final assembly after carb rebuild on my '79 GS1000E. Is there a vacuum tube between carbs #2 & #3? Pics I took don't show it clearly. I know there are the short tubes between 1 & 2, and between 3 & 4, but there are the same ports (maybe undrilled?) between 2 & 3. I put a hose there, but it seems to be in the way of the throttle return spring. No problem to cut it out if I don't need it. Thanks!
 
Those are not "vacuum" tubes, they are "vent" tubes.

There should be a tube between 1&2, then there is a longer tube that connects to the nipple on #2. There should be another tube between 3&4, the longer tube connects to the nipple on #4. There should be nothing between 2&3.

The nipple on #3 is the vacuum fitting that should connect to your petcock.

.
 
that will be the vacuum pipe to your pet cock. you need it!. reroute it to miss your return spring or post pics so we can see whats wrong
 
This tube...........

This tube...........

The black tube behind the idle screw. Should it be there? Uses the same ports as the short, (like 1/2" long) tubes that are between 1 & 2, and 3 & 4. Not the 3 longer, smaller tubes that go to the petcock and atmosphere.
 
That tube isn't needed between 2&3. You noticed that they are undrilled and your eyes aren't playing tricks on you.
 
That's better!

That's better!

I always save my old parts until the job is complete, and there was no old tube for here. Just wanted to verify. Thanks! Time for the bench sync.
 
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