1979 GS750E did right
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1979 GS750E did right

This is a discussion on 1979 GS750E did right within the Project Builds forums, part of the Caferacer.net Forums category; so now that I have the GS in my garage, I can finally start ordering the things I need for it. The PO used if ...

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Thread: 1979 GS750E did right

  1. #1
    Senior Member CaTacL1sm's Avatar
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    1979 GS750E did right

    so now that I have the GS in my garage, I can finally start ordering the things I need for it. The PO used if for track days, but due to a TBI from an accident (presumably on a different bike...) can no longer ride. My plan is to catch up on basic maintenance for it, do some suspension improvements and get it on the road. I still need to get a safety wire tool to wire everything down once its all assembled again.

    As a side note... I know it may be douchey, but I'm seriously considering leaving the number plates on for the street.

    Right now I have the following ordered:
    -clymer manual
    -Progressive front and rear suspension
    -rear caliper rebuild kit
    -front fork seals
    -all balls wheel bearings
    -all balls steering stem bearings

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    The rear caliper was "sticky" and after taking it apart, one of the pistons was frozen, and the master cylinder had seen better days (there was actually a plastic o-ring lodged in the hole of the banjo bolt... weird). Luckily, the PO had two other rear calipers in various states that he gave me so I took all three and disassembled and cleaned them in order to put together one good one. A grease gun is the absolute easiest way to undo a stuck caliper!

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    So right now, I have three serviceable rear calipers, two good pistons, and one good master cylinder. All that's left is for the rebuild kit to arrive and to get it all put together. Later on I'll upgrade the rear to braided lines.

    The next issue was the leaky petcock. The PO had switched from a vacuum one to standard, and had made his own bracket for it. After taking the petcock off the tank and cleaning away the paper gasket and rubber cement gasket I found why it was leaking (other than shitty gasket materials).

    Seems that there's a dent in the side of the opening that was a little too much for the rubber sealer to handle. In the next couple days I'll sand the area down and hit it with a coat of JB weld to level it all out, then get a strip of rubber to use as a gasket. This ought to do until I get the second tank cleaned out and painted up.
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    Here's the petcock assembly... I've added some O-rings to the screws to hold them on for now. When the petcock is attached to the tank, the O-rings will seat in the recesses on the tank (like stock).

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    And at the end of the day (but it still runs with fuel in the carbs):

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    Marcaaron619 likes this.
    I thought that a cafe racer was a custom that you could do whatever you wanted and there is no right or wrong.

  2. #2
    Member scottshaffer's Avatar
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    Looking forward to future updates.

  3. #3
    Senior Member kenessex's Avatar
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    You have got the makings for a very nice vintage superbike. The one glaring issue for me is that hideous seat. It also looks like the rear cowl sits too far back behind the rear edge of the rear wheel. I would shorten the whole thin until the end of the seat cowl is even with the back edge of the rear tire. Then reupholster the shortened seat pan to look right with the tank and rear cowl. The yellow with black number plates are novice colors for club racing. If you are going to run number plates then do it with white plates and a black 34 on them. Google images will give you some ideas.

    Ken
    WERA 119
    CCS 119
    CRA 119
    AHRMA not anymore
    \"Think twice before you speak, and then you may be able to say something more insulting than if you spoke right out at once.\"
    Evan Esar
    Newbies, Geeto and Tex (Bye Tex)hate me!!

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    Senior Member hillsy's Avatar
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    Jeez - dodgy fuel tap conversion.

    Aren't your bolt o rings going to hold the plate off the tank and not let it seal? I'd just be getting another fuel tap from China off eBay. Most fuel taps have the same bolt spacings.

  6. #5
    Senior Member CaTacL1sm's Avatar
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    Quote Originally Posted by kenessex View Post
    You have got the makings for a very nice vintage superbike. The one glaring issue for me is that hideous seat. It also looks like the rear cowl sits too far back behind the rear edge of the rear wheel. I would shorten the whole thin until the end of the seat cowl is even with the back edge of the rear tire. Then reupholster the shortened seat pan to look right with the tank and rear cowl. The yellow with black number plates are novice colors for club racing. If you are going to run number plates then do it with white plates and a black 34 on them. Google images will give you some ideas.

    Ken
    Thanks for the advice.

    The seat is the stock setup, just the pan has been reupholstered... Ill see if it needs adjustment after riding it a bit.
    I thought that a cafe racer was a custom that you could do whatever you wanted and there is no right or wrong.

  7. #6
    Senior Member CaTacL1sm's Avatar
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    Quote Originally Posted by hillsy View Post
    Jeez - dodgy fuel tap conversion.

    Aren't your bolt o rings going to hold the plate off the tank and not let it seal? I'd just be getting another fuel tap from China off eBay. Most fuel taps have the same bolt spacings.
    There's a recess in the tank for the o-rings. The rubber gasket will cover the whole aluminum plate and the whole thing should sit flush. That said, yes, I am going to replace the whole thing... Probably with a pingel set up.
    I thought that a cafe racer was a custom that you could do whatever you wanted and there is no right or wrong.

  8. #7
    Senior Member jaguar's Avatar
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    These superbikes really seem to offer a tone of useable performance for bargain prices.
    I am Derby\'s Bitch


    Some times things come around that are so singularly inept it gives you a whole new appreciation for the ept

  9. #8
    Senior Member grandpaul's Avatar
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    Quote Originally Posted by kenessex View Post
    The yellow with black number plates are novice colors for club racing.
    That's the colors required for Sportsman classes in AHRMA...
    GrandPaul
    Author, \"Old Bikes\"

  10. #9
    Senior Member knappyfeet's Avatar
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    That's going to be one sweet GS. I agree with the seat comment but I'm sure you will address that. I'm looking forward to the progress.

  11. #10
    Senior Member kenessex's Avatar
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    Quote Originally Posted by grandpaul View Post
    That's the colors required for Sportsman classes in AHRMA...
    True, but the GS750 would be a vintage superbike in AHRMA and that requires green plates. If that was raced it would have been with WERA, CCS, CRMA or CRA but most likely MRA if it was a MO bike. All of those Orgs have yellow and black as novice plates. I have raced with all of them and AHRMA, except CMRA.

    Ken
    WERA 119
    CCS 119
    CRA 119
    AHRMA not anymore
    \"Think twice before you speak, and then you may be able to say something more insulting than if you spoke right out at once.\"
    Evan Esar
    Newbies, Geeto and Tex (Bye Tex)hate me!!

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