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850 jugs on GS750

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    850 jugs on GS750

    I want to put a GS850 cylinder block on my '77 GS750. If anyone has such a cylinder block with matching useable pistons that they want to get rid of please send me a PM.

    Thanks
    Brian

    #2
    Don't forget to install the 850 pistons, too.

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      #3
      Very funny Steve...but good point.

      Comment


        #4
        BTW, can anyone describe, in detail, what grinding has to be done on the spigot openings in the GS750 case to accomodate non-'79 GS850 cylinders? How do you keep metal from falling into the engine?

        Thanks
        Brian

        Comment


          #5
          What grinding?
          Mine, fell right in place.

          Daniel

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            #6
            Originally posted by 7981GS View Post
            What grinding?
            Mine, fell right in place.

            Daniel
            HMM, seems I read in here somewhere that cylinders from '80 and new GS850s didn't fit without some mod to the GS750 case. What year of cylinders did you use?

            Brian

            Comment


              #7
              '81 850 into '79 750.
              Currently thinking about seeing if the 1000 bits will fit in that same engine. (920 cc's?)
              (It was pulled several years ago for a 1000 replacement.)
              It sure would be nice to have a kick start bike again. Just for the shocked looks on faces alone! LOL!

              Daniel
              Last edited by Guest; 11-24-2010, 03:22 PM.

              Comment


                #8
                Originally posted by 7981GS View Post
                '81 850 into '79 750.

                Daniel
                That's good news Daniel. I'm going to do it as soon as I can find the 850 parts.

                Don't really know about the 1000 parts in a 750. I know the GS1000 has a longer stroke as well as bigger bore. Are you thinking of putting the 1000 crank in?

                I have read on here that it is not that hard to put a whole GS1000 engine in a GS750 and in fact the GS1000 engine is lighter than the 750.

                Brian

                Comment


                  #9
                  Originally posted by gssuzukixxx View Post
                  HMM, seems I read in here somewhere that cylinders from '80 and new GS850s didn't fit without some mod to the GS750 case. What year of cylinders did you use?

                  Brian
                  Check out this thread: http://www.thegsresources.com/_forum...=163827&page=2

                  My cylinders hit the inside of the cases with about 10mm to go. It was pretty close; I only had to remove a few mls to make them fit. I stuffed rags in the cases and smeared a bit of grease around to try and catch the aluminium chips. Some smaller pieces got through and showed up in the filter which I changed early (50kms) for this reason.

                  If I did it again I probably would pulll the sump cover and flush it through with kero.

                  The photo below shows what I removed. I had to do this on both sides of the outside holes of the cases.
                  1979 GS750E

                  Comment


                    #10
                    Thanks Coady, that is just what I was after. Still looks pretty doable.

                    Also, which cams did you guys use. I understand the 850 cams are different than the 750...more low and midrange. I must say, I own a GS850 and a 750 and don't notice a huge diffence. They both have a furious rush of power above about 6000 RPM.

                    Brian

                    Comment


                      #11
                      Originally posted by gssuzukixxx View Post
                      That's good news Daniel. I'm going to do it as soon as I can find the 850 parts.

                      Don't really know about the 1000 parts in a 750. I know the GS1000 has a longer stroke as well as bigger bore. Are you thinking of putting the 1000 crank in?

                      I have read on here that it is not that hard to put a whole GS1000 engine in a GS750 and in fact the GS1000 engine is lighter than the 750.

                      Brian


                      Not at all what I was thinking.
                      I was thinking of building a short stoke large bore version of the GS engine.
                      High revving big bore.
                      Something that suzuki never did kind of thing, just to see if it could be done.
                      Not sure which cylinder head to use yet or stock/ after market pistons.
                      Lot's of possibilities.
                      Perhaps RapidRay knows if it can be done?

                      On the 1100 into a 750 frame... BTDT.


                      Daniel

                      Comment


                        #12
                        The cylinder stud pattern is the same from GS750, 850, 1000,& 1100 8 valve models. The wrist pins are 16mm for 750/850 and 18mm for 1000/1100. The 750/850 use a cam chain idler between the cams, the 1000/1100 doesn't. The 750/850 use 36mm & 30mm valves. The 1000/1100 use 38mm & 32mm valves.
                        Anything is possible if you want it bad enough. I have a 1025cc GS750 motor. Stock stroke with a 76mm bore. Uses wiseco KZ1000 pistons that are 6mm over for the KZ, and 11mm over for the GS750. Wrist pins are 17mm so the stock GS750 rods are bored and honed 1mm over. Custom base and head gaskets. The head has 37.5mm intake valves and 31mm exhaust valves. Dar

                        Comment


                          #13
                          Originally posted by TeamDar View Post
                          The cylinder stud pattern is the same from GS750, 850, 1000,& 1100 8 valve models. The wrist pins are 16mm for 750/850 and 18mm for 1000/1100. The 750/850 use a cam chain idler between the cams, the 1000/1100 doesn't. The 750/850 use 36mm & 30mm valves. The 1000/1100 use 38mm & 32mm valves.
                          Anything is possible if you want it bad enough. I have a 1025cc GS750 motor. Stock stroke with a 76mm bore. Uses wiseco KZ1000 pistons that are 6mm over for the KZ, and 11mm over for the GS750. Wrist pins are 17mm so the stock GS750 rods are bored and honed 1mm over. Custom base and head gaskets. The head has 37.5mm intake valves and 31mm exhaust valves. Dar
                          So... How does it run?
                          You have got me on the edge of my seat waiting...

                          Daniel

                          Comment


                            #14
                            Originally posted by gssuzukixxx View Post
                            Also, which cams did you guys use. I understand the 850 cams are different than the 750...more low and midrange. I must say, I own a GS850 and a 750 and don't notice a huge diffence. They both have a furious rush of power above about 6000 RPM.

                            Brian

                            I just used my GS750 head and cams. Top end rush you mentioned seems similiar to before, but low end/mid range grunt has definitely picked up. Having said that, my clutch started slipping shortly after the rebuild at around 6k in 3rd gear so I guess there is more HP there; I put new springs in and fixed that. I'm pretty happy with the result but the stock 750 was pretty good already.
                            1979 GS750E

                            Comment


                              #15
                              Originally posted by TeamDar View Post
                              Anything is possible if you want it bad enough. I have a 1025cc GS750 motor. Stock stroke with a 76mm bore. Uses wiseco KZ1000 pistons that are 6mm over for the KZ, and 11mm over for the GS750. Wrist pins are 17mm so the stock GS750 rods are bored and honed 1mm over. Custom base and head gaskets. The head has 37.5mm intake valves and 31mm exhaust valves. Dar


                              Tell us about the results! Any what carbs you're using.
                              GS850GT

                              Comment

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