Simple question, where does this hose lead to and what does it do?

 

Well he's right. One nipple is just a vent and the other is the overflow,they both just point down,obviously with hoses attatched.

 

Easy on there Hoss

Ones an fuel overflow the other a vacuum to the petcock


Best to try asking these questions in the bike specific MAIN forum thread

 

You are pointing to two different ports in the photos.

Let's start with photo #1.
The smaller one is missing a hose that comes off the tank and makes a 90° turn immediately after leaving the nipple. It then travels toward the rear of the bike but drops down in front of the air filter box. It drops down to about the bottom of the box and terminates. It's the Fuel tank breather. You need to let air into the tank so that when fuel leaves the tank the air will fill the volume that the fuel occupied. Without the breather, fuel will not drop to the carbs and the bike will not run properly. If you look at a water dispenser, water drops until air bubbles up the spout and displaces the lost water in the water jug. Only then will more water come out. Bikes are no different. You need air to get in so they run a free path, basically, from the bottom of the air box to a tube running from the bottom of your tank to the very top of the inside. This lets air into the tank. It doesn't hurt to leave the tube off, it just may pick up un-clean air. There is not a major air flow. Just some air to displace the lost fuel volume. Yes, a hose may help as it hangs down and makes it hard for dirt to go up it with such a slow if noticeable air flow.

In photo #2
You are pointing to the larger fuel over flow nipple. There are no hoses connected to this nipple. When you lower the tank, the nipple drops into the rubber funnel shaped receptor just to the right side of the engine ventilation tube that runs between the valve cover and the air box. The funnel shaped receptor has a hose connected to it where it allows and fuel over flow that it gets to drop to the ground. Therefore a hose is connected to it and the hose terminates some where toward the bottom of the engine. Once again, it is not important to have a hose on the rubber funnel shaped receptor unless you are over filling the tank and having overflows. The receptor hose keeps fuel from dropping on a hot engine where it could ignite.

Everything looks good on your bike, the one hose missing (photo #1) does nothing to effect performance of the engine. It could effect it if it were there but was plugged.

The over flow nipple does not get a hose. It just mates with the receptor down below when the tank is dropped.

 

Thanks Tim,
Your explanation is spot on to what I am dealing with.
The nipple you said was the tank breather hose must be plugged.
My bike will run out perfect for very high speed and then bog and stop running.
It happens at speed limit speeds also but it takes a few more miles to bog and quit.
I will hear air sucking noises coming from around the gas cap and when I open it air will rush in. I will have to wait a few minutes and the bike will start and go again until the bogging starts.

 

which option is that bile under?

 

Tim, the tank breather hose needs to drop inside the breather?

 

it's in the saloon from me getting sick of moving your threads and posts

BTW here's a useful link and part #6 is the fuel overflow cup

 

OK, now we are getting somewhere. You will need to push a wire into the breather to clear it. Maybe put a hose on it and blow air in to clear it. The only problem is that maybe a mud wasp plugged it and you will be blowing crap into the tank. You need to clear it or run with the cap open. Air needs to get in.

The breather is just a breather. The hose is not important. The hose just comes off the nipple and goes down and ends.

The breather is made by drilling a hole in the tank, inserting the metal tube into the tank and then welding around the tube sealing the tank/tube interface. The nipple is actually the end of the metal tube that is sticking out of the tank. The tube runs up inside the tank and is above the fuel level. You need to make sure that tube is clear or fuel will not flow.

It may be best to try and keep the tank as far down as possible and wiggle a wire up in the tube. That way the crap that is plugging it will hopefully drop out and not end up in the tank. I would only blow air in the last resort situation.

 

AWESOME AWESOME AWESOME!!!! Ill try some 12-2 electrical wire thats been stripped first. Im on a mission.
Ill buy a rubber hose to go on it from Ace hardware this evening.