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850 head can go how big?

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    850 head can go how big?

    I'm just wondering if this head can be punched over, and if anyone knows if parts are available to do so

    #2
    If im not mistaken, the early 850 jugs were just punched out 750 jugs. With that in mind, they're already going to be thinner than stock 750 jugs. IF there is a bore kit available, going any LARGER with THOSE jugs could result in bad times, as the cylinder walls would be really thin at that point, and lead to overheating. You trying to make a drag bike out of that thing? You havent even got the 850 kit on it, and its already not enough power for you? Why dont you sell it and buy something bigger? Market is pretty soft right now, I bet you could sell that thing for a grand or so, and then pick up a 1000E or G in good running shape for 1500ish...

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      #3
      Originally posted by TheCafeKid View Post
      If im not mistaken, the early 850 jugs were just punched out 750 jugs. With that in mind, they're already going to be thinner than stock 750 jugs. IF there is a bore kit available, going any LARGER with THOSE jugs could result in bad times, as the cylinder walls would be really thin at that point, and lead to overheating. You trying to make a drag bike out of that thing? You havent even got the 850 kit on it, and its already not enough power for you? Why dont you sell it and buy something bigger? Market is pretty soft right now, I bet you could sell that thing for a grand or so, and then pick up a 1000E or G in good running shape for 1500ish...
      You got a point. I was fishing for info on that head, and that was what I was looking for. I haven't done the swap, and wondered if it could go and larger. going to the 850 will give it a little more umph, but like you say, this is a good time to buy.

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        #4
        Originally posted by TheCafeKid View Post
        If im not mistaken, the early 850 jugs were just punched out 750 jugs. With that in mind, they're already going to be thinner than stock 750 jugs. IF there is a bore kit available, going any LARGER with THOSE jugs could result in bad times, as the cylinder walls would be really thin at that point, and lead to overheating. You trying to make a drag bike out of that thing? You havent even got the 850 kit on it, and its already not enough power for you? Why dont you sell it and buy something bigger? Market is pretty soft right now, I bet you could sell that thing for a grand or so, and then pick up a 1000E or G in good running shape for 1500ish...
        The early ('79) 850's aren't punched out 750 cylinders. They were re-cast and have 3mm wall thickness sleeves. You can further punch them out safely to 71-72 mm, but you need to go custom pistons to do that!!

        As said earlier, buy a bigger bike if you want mega performance.
        :) The road to hell is paved with good intentions......................................

        GS 850GN JE 894 10.5-1 pistons, Barnett Clutch, C-W 4-1, B-B MPD Ignition, Progressive suspension, Sport Demons. Sold
        GS 850GT JE 1023 11-1 pistons. Sold
        GS1150ES3 stock, V&H 4-1. Sold
        GS1100GD, future resto project. Sold

        http://i155.photobucket.com/albums/s...s/P1000001.jpg
        http://i155.photobucket.com/albums/s...s/P1000581.jpg

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          #5
          Originally posted by crapwacker View Post
          I'm just wondering if this head can be punched over, and if anyone knows if parts are available to do so
          Sorry to nit pick but the head is never "punched over", it's the cylinder that's bored out so larger pistons can be fit.
          Ed

          To measure is to know.

          Mikuni O-ring Kits For Sale...https://www.thegsresources.com/_foru...ts#post1703182

          Top Newbie Mistakes thread...http://www.thegsresources.com/_forum...d.php?t=171846

          Carb rebuild tutorial...https://gsarchive.bwringer.com/mtsac...d_Tutorial.pdf

          KZ750E Rebuild Thread...http://www.thegsresources.com/_forum...0-Resurrection

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