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GS550 Bored 740cc Officially Done!

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    #61
    Thanks for all the information Chuck. I am really curious about the Wiseco big bore 650 pistons. I am wanting to rebuild this bike to the best of my ability, and it sounds like I would be able to get a little more power out of the big bore 650 pistons. I have never started a thread before, but I will try to get one going about the 650 big bore pistons.

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      #62
      Ok guys I started a new thread in the performance/tuning/mods section of the website. Is called "Potential Group Purchase - Wiseco GS650 741cc pistons". If you are interested in a set please inform me on the thread.

      Thanks,

      Andy

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        #63
        Awesome, I'm really glad Adam aka Loud ET got that 1981 catalog and scanned the GS big bore kit page, and also very stoked that Ace took the initiative to call Wiseco!
        '77 GS750 920cc heavily modded
        '97 Kawasaki KDX220R rugged terrain ripper!
        '99 Kawasaki KDX220R​ rebuild in progress
        '79 GS425stock
        PROJECTS:
        '77 Suzuki PE250 woods racer
        '77 GS550 740cc major mods
        '77 GS400 489cc racer build
        '76 Rickman CR1000 GS1000/1100
        '78 GS1000C/1100

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          #64
          Anyone done this to their 550 yet and put it on a dyno? Also what clutch is used? Stock?

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            #65
            Originally posted by Kenny View Post
            Anyone done this to their 550 yet and put it on a dyno? Also what clutch is used? Stock?
            No dyno run personaly, I believe someone else has. The trouble there is they did it differently. Stock clutch is fine for the torque. Same clutch on the GS650.

            For horsepower, you can do some back calculations. Top speed with 549cc, was 110mph. After, 140. IIRC... it's been a while. Mind I had a big foam airbox on mine, as opposed to the stock airbox, and an alphabet headers 4-1.
            You'd have to be crazy to be sane in this world -Nero
            If you love it, let it go. If it comes back....... You probably highsided.
            1980 GS550E (I swear it's a 550...)
            1982 GS650E (really, it's a 650)
            1983 GS550ES (42mpg again)
            1996 Yamaha WR250 (No, it's not a 4 stroke.)
            1971 Yamaha LT2 (9 horsepower of FURY.)

            Comment


              #66
              Originally posted by Nerobro View Post
              For horsepower, you can do some back calculations. Top speed with 549cc, was 110mph. After, 140.
              That's quite a jump!
              1982 GS1100E V&H "SS" exhaust, APE pods, 1150 oil cooler, 140 speedo, 99.3 rear wheel HP, black engine, '83 red

              2016 XL883L sigpic Two-tone blue and white. Almost 42 hp! Status: destroyed, now owned by the insurance company. The hole in my memory starts an hour before the accident and ends 24 hours after.

              Comment


                #67
                Originally posted by Rob S. View Post
                That's quite a jump!
                Yes. Yes it is. I bet.. we can find if i'm lying by searching the forum. I can't be bothered at the moment. :-) Dealing with memory that's 15 years on is less reliable than posts I made 15 years ago.

                .............. I'd do a much better job on the bike now, than I did then.
                You'd have to be crazy to be sane in this world -Nero
                If you love it, let it go. If it comes back....... You probably highsided.
                1980 GS550E (I swear it's a 550...)
                1982 GS650E (really, it's a 650)
                1983 GS550ES (42mpg again)
                1996 Yamaha WR250 (No, it's not a 4 stroke.)
                1971 Yamaha LT2 (9 horsepower of FURY.)

                Comment


                  #68
                  I believe you can use a 77 - 79 GS750 clutch basket because it has one extra disc & plate than the 550/650, but uses the same parts otherwise.
                  I have one of these engines built & sitting on my workbench, but have yet to swap it, too many bike projects, too little time!
                  '77 GS750 920cc heavily modded
                  '97 Kawasaki KDX220R rugged terrain ripper!
                  '99 Kawasaki KDX220R​ rebuild in progress
                  '79 GS425stock
                  PROJECTS:
                  '77 Suzuki PE250 woods racer
                  '77 GS550 740cc major mods
                  '77 GS400 489cc racer build
                  '76 Rickman CR1000 GS1000/1100
                  '78 GS1000C/1100

                  Comment


                    #69
                    Originally posted by Nerobro View Post
                    Yes. Yes it is. I bet.. we can find if i'm lying by searching the forum. I can't be bothered at the moment. :-) Dealing with memory that's 15 years on is less reliable than posts I made 15 years ago.
                    Didn't mean to imply you were lying. Wait, what were we talking about?
                    1982 GS1100E V&H "SS" exhaust, APE pods, 1150 oil cooler, 140 speedo, 99.3 rear wheel HP, black engine, '83 red

                    2016 XL883L sigpic Two-tone blue and white. Almost 42 hp! Status: destroyed, now owned by the insurance company. The hole in my memory starts an hour before the accident and ends 24 hours after.

                    Comment


                      #70
                      Originally posted by Rob S. View Post
                      Didn't mean to imply you were lying. Wait, what were we talking about?
                      hahaha, I'm implying my memory might be fuzzy. :-)
                      You'd have to be crazy to be sane in this world -Nero
                      If you love it, let it go. If it comes back....... You probably highsided.
                      1980 GS550E (I swear it's a 550...)
                      1982 GS650E (really, it's a 650)
                      1983 GS550ES (42mpg again)
                      1996 Yamaha WR250 (No, it's not a 4 stroke.)
                      1971 Yamaha LT2 (9 horsepower of FURY.)

                      Comment

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