• Required reading for all forum users!!!

    Welcome!
    Register to access the full functionality of the GSResources forum. Until you register and activate your account you will not have full forum access, nor will you be able to post or reply to messages.

    A note to new registrants...
    All new forum registrations must be activated via email before you have full access to the forum.

    A Special Note about Email accounts!
    DO NOT SIGN UP USING hotmail, outlook, gmx, sbcglobal, att, bellsouth or email.com. They delete our forum signup emails.

    A note to old forum members...
    I receive numerous requests from people who can no longer log in because their accounts were deleted. As mentioned in the forum FAQ, user accounts are deleted if you haven't logged in for the past 6 months. If you can't log in, then create a new forum account. If you don't get an error message, then check your email account for an activation message. If you get a message stating that the email address is already in use, then your account still exists so follow the instructions in the forum FAQ for resetting your password.

    Have you forgotten your password or have a new email address? Then read the forum FAQ for details on how to reset it.

    Any email requests for "can't log in anymore" problems or "lost my password" problems will be deleted. Read the forum FAQ and follow the instructions there - that's what we have one for...

  • Returning Visitors

    If you are a returning visitor who never received your confirmation email, then odds are your email provider is blockinig emails from our server. The only thing that can be done to get around this is you will have to try creating another forum account using an email address from another domain.

    If you are a returning visitor to the forum and can't log in using your old forum name and password but used to be able to then chances are your account is deleted. Purges of the databases are done regularly. You will have to create a new forum account and you should be all set.

Changing to gravity flow petrop tap.

  • Thread starter Thread starter Grumpy
  • Start date Start date
G

Grumpy

Guest
Hi Folks, apologies if this topic has been covered before but can anyone tell me about changing the petrol tap from the standard vaccum type to a gravity flow type. To explain, I'm using an old mustang style tank on a GS 550 L that I got in pieces some months ago the standard tank was beyond all redemption so hence the mustang. I've been told that you can blank off the vaccum pipes and use a universal gravity tap. Is this the case. My second question is regarding the carbs themselves, I've stripped and cleaned the carbs, replaced the jets but I did'nt seperate the carbs from the connecting plates. I notice that there may be a joining pipe missing between carbs 2 and 3, at least thats what it looks like as the other carbs have a T piece swivelling gadget between the carbs.
In other words I have a fuel pipe and two other pipes coming from the carbs, I think the pipe nearest the petrol tap is the vaccum pipe and normally connects to the smaller nipple on the tap in my case this should be blanked off to use the gravity fed tap. What purpose do the other pipes serve, are they vents and how many pipes should I have coming from the carbs. Confused yet ???. I know little or nothing about CV carbs so any help would be greatly appreciated.
:concern:
 
There is the fuel delivery hose, the vacuum take off, needs to be blanked off and two vent pipes from the swivelly tees between the outer pairs.
You will need to remember to shut the fuel OFF. Relying on the float needles will result in a pool of gas the day one hangs and a smoker will be walking by and............

Wiring diagrams and service manual

http://members.dslextreme.com/users/bikecliff/

Parts diagrams

http://www.cmsnl.com/suzuki-gs550l-...e22-e24-e25-e26-e34-e39_model13482/partslist/
 
Last edited:
Many Thanks, I have a feeling the carb assembly was put back together incorrectly at some stage as it has only three pipes coming from it. it seems like a bits gone missing.:o
 
The vents are often forgotten on assembly and are tricky to get back on after because the tee swivels. They are often then left off, one or both. Mine had one missing, didn't seem to affect it too much although it might be hard to tell in the middle of doing all the things needing work in the early stages.
 
You can see how it would happen alright. I'll make up a T piece and replace the missing bit while the carbs are off the bike. Thanks for your help.😊
 
Not sure of the year,but heres a guess.

Parts outlaw

Also, I agree with the others on having some way to shut off the fuel.
20161008_202306.jpg
 
Last edited:
I can imagine a pool of petrol could be a wee bit of a disaster alright. I'll use some type of after market tap with an on off lever.
 
Changing to a manual tap is easy enough, but you need to know which carbs are on the bike. Easiest would be to know what year the bike is. The first-year 550L was '79, it had VM carbs. Later years had BS carbs (also called 'CV-type'). The carbs in the picture that oldman99 showed are the newer BS carbs.

On the VM carbs, the vacuum tap is on carb #3. Carbs are numbered from left to right, as you sit on the bike. #1 is under your clutch hand, #4 is under your throttle hand. On the BS carbs, the vacuum tap is on the #2 carb. All you need to do is put a short piece of hose on the vacuum nipple and insert a small machine screw or bolt to block it off.

The hoses on the Ts between the carbs are your vent hoses. There is not one between #2 and #3 because they are connected to #1 and #4, respectively. Since you mention the Ts, I am going to say that you have BS carbs. Neither one of those hoses should be connected to anything except the T on the carbs. They are supposed to be routed over the airbox and sit in a small square loop on the filter housing.

.
 
Steve said:
Changing to a manual tap is easy enough, but you need to know which carbs are on the bike. Easiest would be to know what year the bike is. The first-year 550L was '79, it had VM carbs. Later years had BS carbs (also called 'CV-type'). The carbs in the picture that oldman99 showed are the newer BS carbs.

On the VM carbs, the vacuum tap is on carb #3. Carbs are numbered from left to right, as you sit on the bike. #1 is under your clutch hand, #4 is under your throttle hand. On the BS carbs, the vacuum tap is on the #2 carb. All you need to do is put a short piece of hose on the vacuum nipple and insert a small machine screw or bolt to block it off.

The hoses on the Ts between the carbs are your vent hoses. There is not one between #2 and #3 because they are connected to #1 and #4, respectively. Since you mention the Ts, I am going to say that you have BS carbs. Neither one of those hoses should be connected to anything except the T on the carbs. They are supposed to be routed over the airbox and sit in a small square loop on the filter housing.

.
Click to expand...
The bike is a 1980 L
 
The bike is a 1980 American spec L. The vaccum nipple is on #2 carb so I guess they are BS type carbs. You saved me a lot of hassel and time breaking the carbs apart. Thanks.
 
You must log in or register to reply here.
Back
Top