• 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.

Would anyone be interested in stainless manifolds?

  • Thread starter Thread starter makenzie71
  • Start date Start date
M

makenzie71

Guest
I'm having to widdle these things out to mount up my CB750 30mm carburetors and in all my measuring I've found a few things out:

1979 GS750E

Carbs...final bore: 26mm
Final bore of manifolds: 25mm~26mm (I think the rubber has swelled a bit on some)
Head: 28mm (actually one is 29mm...I'll post back when I get a better mic in it)

Mating 30mm carbs to a 28mm port would be a lot better without that 25mm bottleneck. I'll be making some manifolds to work it all out. It's a pretty easy setup. The manifolds are just milled tubes with the flanges on one end but I'll have them bored for 30mm down to 28mm (I'll port the head later). The carbs will mount up using simple silicone couplers.

Thought it might be worth tossing out to you people, though, to see if anyone here might have an interest in such a setup. They'd run about $100 a set and they'd come with the silicone, clamps, and bolts. They can be setup to pretty much any size you need...under 2" OD (bore) but that makes room for a 44mm ID, which you'd just never need.

Thought I'd ask. All I have a template for is the manifolds from a GS750. I don't know what all other GS's have the same manifold bolt pattern (2 5/8").
 
makenzie71 said:
I'm having to widdle these things out to mount up my CB750 30mm carburetors and in all my measuring I've found a few things out:

1979 GS750E

Carbs...final bore: 26mm
Final bore of manifolds: 25mm~26mm (I think the rubber has swelled a bit on some)
Head: 28mm (actually one is 29mm...I'll post back when I get a better mic in it)

Mating 30mm carbs to a 28mm port would be a lot better without that 25mm bottleneck. I'll be making some manifolds to work it all out. It's a pretty easy setup. The manifolds are just milled tubes with the flanges on one end but I'll have them bored for 30mm down to 28mm (I'll port the head later). The carbs will mount up using simple silicone couplers.

Thought it might be worth tossing out to you people, though, to see if anyone here might have an interest in such a setup. They'd run about $100 a set and they'd come with the silicone, clamps, and bolts. They can be setup to pretty much any size you need...under 2" OD (bore) but that makes room for a 44mm ID, which you'd just never need.

Thought I'd ask. All I have a template for is the manifolds from a GS750. I don't know what all other GS's have the same manifold bolt pattern (2 5/8").
Click to expand...

79 850, 78-79 1000. Thats prolly bout it. But, Im interested in seeing how they mount up. If i like it, i might be interested in a set for the cafe im always working on. Im a lil slow, but im not understanding, seeing as how pretty much the only thing supporting the carbs is the boots, how they will be held on the bike. Gotta scratch template or something to show us?
 
If the silicon tubes are short enough they will be held exactly the same way they are now.... & for those with an airbox they will be fixed the other side too.

If there is any issue, should be a pretty simple process to make some little support bars that come off the float bowl screws or something.

Dan :)
 
thanks dan...yeah the carburetors will clamp onto the manifolds just like they do now...it's just that now the manifolds will be bigger.
 
You must log in or register to reply here.
Back
Top