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'83 750 Kat carb rebuild

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  • '83 750 Kat carb rebuild

    Hey Gang,

    Well... I went ahead and got a battery and tried to fire up the Kat today. Simply putting gas in the tank = massive fuel leaks from the carbs. Figure I'd better go through them first and rebuild 'em.

    Questions:

    a. best source for rebuild kit? Seem to be plenty on eBay for like $90, but thought I'd ask y'all.

    b. they seem to have some type of vacuum activated slides. Not terribly familiar with this system, having only worked on the old school cable-pulls-the-slide type carbs. Do I need to fiddle with the top of these carbs? What's the scoop?

    c. these carbs are painted black. Are stock carbs black? They look like shit. I'd prefer bare aluminum. Any suggestions for paint removal? I'm thinking they'll need to be bead blasted or vapor blasted or something if they are going to look nice. I mean, with all the nooks and crannies, how in the heck else could I take off all the paint? Anyone ever polish these things? Will they hold a polish?

    Thanks in advance!!!

    Peace,

    - Adam

  • #2
    Hey Adam....I have had good luck with Ebay kits. As far as the slides , yes I would recommend taking those out and cleaning the slide area as well as taking a look at the needles. The paint....wouldn't be able to help you there.

    Good luck brother!
    79 Honda Red CBX, 79 Honda Silver CBX, 82 Suzuki 1000 Katana, 76 Kawasaki KZ900, 84 VF1000F, 07 Honda CBR1000RR Repsol, 95 CB1000 Big One, 1987 Hondaxl600R, 1978 Honda XL250S, 2006 Yamaha TW200

    Comment


    • #3
      Originally posted by sixdog View Post
      Hey Adam....I have had good luck with Ebay kits. As far as the slides , yes I would recommend taking those out and cleaning the slide area as well as taking a look at the needles. The paint....wouldn't be able to help you there.

      Good luck brother!
      Cool, thanks. Is there some type of rubber diaphragm that I need to be careful of when taking the tops off those carbs? Any recommendations? Peace

      Comment


      • #4
        Originally posted by versicat View Post
        Hey Gang,

        Well... I went ahead and got a battery and tried to fire up the Kat today. Simply putting gas in the tank = massive fuel leaks from the carbs. Figure I'd better go through them first and rebuild 'em.

        Questions:

        a. best source for rebuild kit? Seem to be plenty on eBay for like $90, but thought I'd ask y'all.

        b. they seem to have some type of vacuum activated slides. Not terribly familiar with this system, having only worked on the old school cable-pulls-the-slide type carbs. Do I need to fiddle with the top of these carbs? What's the scoop?

        c. these carbs are painted black. Are stock carbs black? They look like shit. I'd prefer bare aluminum. Any suggestions for paint removal? I'm thinking they'll need to be bead blasted or vapor blasted or something if they are going to look nice. I mean, with all the nooks and crannies, how in the heck else could I take off all the paint? Anyone ever polish these things? Will they hold a polish?

        Thanks in advance!!!

        Peace,

        - Adam
        Adam,

        The '83 carbs were black. The best and least damaging way to remove the black is to have the carbs vapor blasted. If you can't find someone locally, I know a guy here in Indiana, but that would mean not having your carbs for a period of time. Vapor blasting looks very good when done correctly, probably no need for polish.

        Carbs are vacuum activated, make sure the vacuum tube from the petcock is clear and not kinked, also. Get them cleaned up and rebuilt, they should work fine, I've never had any issues with mine.
        GS1000SZ, GS1100EZ, GS1000ST (Wes Cooley)

        Comment


        • #5
          Joe's advice is perfect on the vapor blasting. The slides operate with a vacuum diaphragm. Remove the top of the carb and carefully remove the diaphragm ( rubber and slide ) from carb very gingerly.
          79 Honda Red CBX, 79 Honda Silver CBX, 82 Suzuki 1000 Katana, 76 Kawasaki KZ900, 84 VF1000F, 07 Honda CBR1000RR Repsol, 95 CB1000 Big One, 1987 Hondaxl600R, 1978 Honda XL250S, 2006 Yamaha TW200

          Comment


          • #6
            A couple of (bad) photos of vapor blasting. The first is before, the second after. He "blasted" the part for about 20 seconds.... He also had a carb that he had just done, along with it's mate, the blasted one was near perfect. Vapor blasting does not hurt any rubber or plastic parts, either.



            GS1000SZ, GS1100EZ, GS1000ST (Wes Cooley)

            Comment


            • #7
              Originally posted by Suzuki_dog View Post
              A couple of (bad) photos of vapor blasting. The first is before, the second after. He "blasted" the part for about 20 seconds.... He also had a carb that he had just done, along with it's mate, the blasted one was near perfect. Vapor blasting does not hurt any rubber or plastic parts, either.
              Cool. I heard about vapor blasting, and even found a vapor blaster on Craigslist (thought I'd just buy one and pay it off by doing a bit of a side biz; alas, was too expensive).

              That is exactly what I need.

              Comment


              • #8
                Originally posted by versicat View Post
                Cool. I heard about vapor blasting, and even found a vapor blaster on Craigslist (thought I'd just buy one and pay it off by doing a bit of a side biz; alas, was too expensive).

                That is exactly what I need.
                I think he paid $3500.00 for his? Plus chemicals...
                GS1000SZ, GS1100EZ, GS1000ST (Wes Cooley)

                Comment


                • #9
                  Originally posted by Suzuki_dog View Post
                  I think he paid $3500.00 for his? Plus chemicals...
                  That seems expensive - I could buy a vapor blaster and compressor for that. Hmmmm...

                  Comment


                  • #10
                    A good friend of mine from the CBX forum has a shop in Tucson Arizona. He does vapor blasting. Give him a call, tell him Mario sent you and he will probably give you a quote.

                    https://www.restocycle.com/
                    79 Honda Red CBX, 79 Honda Silver CBX, 82 Suzuki 1000 Katana, 76 Kawasaki KZ900, 84 VF1000F, 07 Honda CBR1000RR Repsol, 95 CB1000 Big One, 1987 Hondaxl600R, 1978 Honda XL250S, 2006 Yamaha TW200

                    Comment


                    • #11
                      Carb rebuild

                      Hi Adam,
                      Hopefully you rebuilt your carbs but if you didnt I use and recommend Old school carbs
                      IN san Jose CA
                      As the name suggests this is all they do.They have all the factory mikuni tools and are pretty well known for there work on CBX 'S including Ian Fosters bikes and bikes that show at the Quail gathering.
                      He rebuilt my 81 Katana 1000 slide carbs to perfection after it had sat for 20 years when a local
                      ( so cal ) katana "expert " said they were junk.
                      My Katana is a U K Homologation bike with the factory snoothbores so I wanted them restored
                      If you go this route be patient they take there sweet ass time but the end result was amazing
                      All o rings gaskets and seals were replaced new screws and the choke levers re plated
                      Right out of the box it fired up like new ,Old school has the factory specs for set up.
                      It pulls like a train, rides like it did when it was new.
                      Cant beat that.

                      Comment


                      • #12
                        Fazer is on the money....I own two 1979 CBX's and when I need a good carb rebuild I use Mike Nixon's shop , http://www.motorcycleproject.com/....

                        Basically bolt on and hit the starter button and it runs like new....
                        79 Honda Red CBX, 79 Honda Silver CBX, 82 Suzuki 1000 Katana, 76 Kawasaki KZ900, 84 VF1000F, 07 Honda CBR1000RR Repsol, 95 CB1000 Big One, 1987 Hondaxl600R, 1978 Honda XL250S, 2006 Yamaha TW200

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