unidentified vacuum(?) lines

[79-GS550-L]

Hi everyone,

When I got my bike there were 2 black hoses hanging off of it, plugged up with small screws jammed in them. One of them must have gone to the original petcock (PO replaced the petcock with a non-vacuum-operated one), but I have no idea which one it is or what the other one is.

If you look down at the carbs from the top (like you're sitting on the bike) there are fuel(?) lines running between the 4 carbs... and one line comes from carb #2, just a little to the airbox-side of the fuel rail; the other line comes from carb #3, just a little to the engine-side of the fuel rail.

Anyone have any idea?

Alex

[Nessism]

There are two vent lines that run up and lay on top of the air box. The other, smaller tube goes to the vacuum port of the carb.

[mark]

On VM carbs, there are nipples on carb #2, #3, and #4.

#2 and #4 vent to air and in stock form at least should have hoses that go over the airbox and in front of the rear tire. #3 nipple is your vacuum line that hooks up to the petcock.

[79-GS550-L]

so I should have 3 hoses? 1 going to the petcock and 2 with just open ends? I'll have to look more closely this afternoon. What exactly is the reason for the carb bowl vents going up over the airbox? Can I just leave them off, or will water get in there? I've heard of people having to leave them off when they add pods.

[mark]

so I should have 3 hoses? 1 going to the petcock and 2 with just open ends? I'll have to look more closely this afternoon. What exactly is the reason for the carb bowl vents going up over the airbox? Can I just leave them off, or will water get in there? I've heard of people having to leave them off when they add pods.

I"ve never ridden with with mine off. Its true that the recommendation is usually to leave the hoses off with pod modifications. The hoses are helpful to avoid carburetion problems in heavy crosswinds etc. from what I understand.

I don't think its a real big deal if you leave them off.