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post #1 of 4 (permalink) Old 02-13-2017, 11:49 AM Thread Starter
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Question Where does this tube go?

Hey guys. I'm finishing up the rebuild on my '86 750. There's this tube on the right side of the rear carb That I can't for the life of me figure out where it goes. It has a vacuum (or air blowing out?) pulsing with the RPMs when running.

Here's the kicker: If I don't seal the end of the tube with my finger then that cylinder runs horribly when cold. When the engine warms up, that cylinder runs a little worse when the tube is sealed. I am at a loss.

Please, if anyone knows anything about this let me know.

This is a picture with the tube in question:
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post #2 of 4 (permalink) Old 02-13-2017, 11:56 AM
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Normally that is a vacuum line which goes back to the air injection valve which is/was a part of your exhaust system. Lots of people here remove that and simply plug the vacuum nipple on the carb to stop the issues you're having.
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post #3 of 4 (permalink) Old 02-13-2017, 12:07 PM Thread Starter
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Ah okay. Thank you! I'll just plug her up and we should be good to go.

'86 VN750
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post #4 of 4 (permalink) Old 02-15-2017, 07:34 AM
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Originally Posted by snoopyonderdonk View Post
Ah okay. Thank you! I'll just plug her up and we should be good to go.
Mine had a pipe fitted, it was bent back on itself and a cable tie round it, removed it and fitted a rubber cap to it, only because it was neater, the same pipe on the other car goes to the fuel tap!

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