What is this 4th hose for? HELP!

user11235813 · March 29, 2016, 10:36:02 PM

OK I have four hoses running down the side of the bike near the footpeg. 1. is Tank overflow 2. is Airbox drain, 3. is battery drain and I'm fcuked if I can work out what the fourth hose is.

I've pulled the tank off (again) all the hoses appear to be attached to the carbs, and anyway this mystery 4th hose is not long enough to reach anywhere, at the moment it's routed through a tiny clip on the battery box and it's sticking up a few inches above the battery box.

Possibly the clip on the battery box is meant for the battery drain hose and that mystery hose no. 4 is not meant to be routed through that clip. At any rate, could someone please check if they have four drain hoses near the rh footpeg and what the 4th hose is. Note: it's not the battery overflow which you can see next to it in the photo below.

So what would the fourth hose be that exits near the right footpeg? I'm having conniptions over here please help.

EDIT: bike is a 2010 model, and the mystery hose is fairly thin, thinner than the battery overflow.

lucas · March 29, 2016, 11:41:11 PM

Did/does your bike have California emissions equipment? On California bikes there is a charcoal (or something) canister below the battery box that has hoses that go to it.

http://gstwins.com/gsboard/index.php?topic=2939.0

user11235813 · March 30, 2016, 12:51:37 AM

No, it's an Australian model.

Big Rich · March 30, 2016, 02:24:48 AM

Is the hose connected to anything on the top end, or just hanging loose?

The only small diameter hose that would be that long (that I can think of) would be the battery drain hose and the carb breather hose. I do not know much about the later carbs like yours, but I would make certain that isn't your carb vent hose.

warmachine81 · March 30, 2016, 03:12:59 AM

Fuel tank breather hose I think. Does it have an odd nipple type thing at the bottom end?

user11235813 · March 30, 2016, 05:00:15 AM

@Big Rich, I wondered about a carb breather. I was looking through the workshop manual and apparently the battery breather hose is meant to be in the clip that the mystery hose is currently in. At the moment the mystery hose is just sticking up in the air not connected to anything.

I've pulled the tank off and checked all the hoses that come out of the carb but I can't see which one is the breather, this is a small diameter hose. I thought though that the breather hose was the thick hose that comes off a T sections at the back that goes over the top of the air box and is open to the atmosphere. There's another hose coming off a T section at the top of the carbs, it's short and fat and has a filter on the end of it.

All I know for sure is that there are four hoses exiting near the footpeg and I know what three of them are as I have already stated in the first post. So I know what it definitely isn't. I'm hoping that someone with the four hoses can eliminate the three that I know it isn't (fuel overflow, airbox drain, battery drain) and tell me what this final hose is.

I can say whatever it is, it is not causing any problems, apart from my mental health that is.

@warmachine81, there is a fat hose with a nipple on it but that is the airbox drain hose, and as I said in the first post, it's not the fuel overflow, which is what I assume you meant by the fuel breather hose?

Big Rich · March 30, 2016, 05:18:47 AM

Sorry User, wish I knew more about all the F hoses to help. Just looking at the parts diagram on Partzilla, and it appears there are quite a few hoses on the "canister" and "2nd air" systems. Maybe have a look around there and try to mate your current hoses to what's online?

I'm sure somebody will chime in though. Good luck!

Joester41 · March 30, 2016, 05:25:35 AM

Im thinking its either your carburetor air vent (not breather with filter), which usually routes from the T just above the intake over the top of the airbox to the rear, or your fuel cap water drain hose.

Joester41 · March 30, 2016, 05:35:58 AM

That picture might not be best, since i did some re-routing and removed the airbox.

Here is the page from the GS500F suppliment.

user11235813 · March 30, 2016, 06:01:45 AM

@Joester4, "or your fuel cap water drain hose." You mean the hose that comes out the bottom of the tank near the tank petcock? or is there some other drain hose for the tank?

@Joester4, OK thanks so I can now be sure it's not the breather and it's not the air vent hose. It doesn't look like any of those hoses drain to the bottom of the bike except for the Air Cleaner drain hose which is already accounted for, its the one with a nipple at the end of it.

Here's a shot of the four hoses at the footpeg...

Joester41 · March 30, 2016, 08:11:26 AM

Quote from: user11235813 on March 30, 2016, 06:01:45 AM
@Joester4, "or your fuel cap water drain hose." You mean the hose that comes out the bottom of the tank near the tank petcock? or is there some other drain hose for the tank?

Yes, its a tube that runs through your tank and connects to the recess in the top of the tank where the gas cap goes. this is for accumulated water or gas that gets into the recess.

Was this tube left from a previous owner, or did you recently take the bike apart and are now putting it back together?

Sandgroper57 · March 30, 2016, 03:48:25 PM

Just a thought.
Has your battery been changed and the vent is on the LHS now? Could just be the original vent hose left in situ and now unused.

user11235813 · March 30, 2016, 07:36:08 PM

@Joester41, OK you're surely talking about the outlet that comes out the bottom of the tank near the petcock? In which case that is accounted for.

Yes all these hoses were there from the original owner, the bike didn't look like it had anything done to it. But I never noticed this hose sticking up near the battery compartment before. Maybe it was always like this.

@ Sandgroper57, I was thinking along those lines. However it looks like it has the original lead acid battery in it and it's not as rubbery as the current battery drain hose. But yes it could very well be for a battery vent on the rhs.

The bike is running fine, I guess that I'll have to put this one to bed for the moment.

Let me ask this, notwithstanding that I don't know what model gs you have but how many hoses do you have exiting near the rhs footpeg, out of interest. Three or four.

Joester41 · March 31, 2016, 04:40:58 AM

I only have 2 if i am remembering correctly, however I use a lithium battery and i removed the airbox. Only 2 I have are the tank drain and the carb vent that used to run over the airbox now routing down the right side over the lunchbox air filter.

Sandgroper57 · March 31, 2016, 04:46:59 AM

Quote from: user11235813 on March 30, 2016, 07:36:08 PM
Let me ask this, notwithstanding that I don't know what model gs you have but how many hoses do you have exiting near the rhs footpeg, out of interest. Three or four.

Hi user11235813
Mine is a 2013 model and has three hoses, tank, airbox and battery. Tried to upload a photo but get a message saying the upload folder is full. My battery vents to the RHS and through the guide on the battery box as in one of your photos.
Hope this helps.

lucas · March 31, 2016, 11:20:34 AM

You could just look at the hose diagrams in the service manual to verify that all the necessary hoses are in place and if you already have all the hoses you need you can pull this one off the bike and discard it.

Figure it by the process of elimination

user11235813 · April 02, 2016, 08:24:33 PM

It does indeed appear to be a completely superfluous hose not found on other gs500's of my year. I can only conclude that it must be an extra battery vent hose.

Thanks to everyone who helped.

lucas · April 04, 2016, 12:56:57 AM

Does that mean your question was "Answered"?

user11235813 · April 04, 2016, 03:38:15 AM

ah ha, I did change it but I must have forgotten to 'save'.

BTW this would make an excellent practical joke on someone.

MarcusNoer · April 04, 2016, 12:58:07 PM

My GS500 have a hose going from the carburetors. I think its called a breather or something.

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What is this 4th hose for? HELP!