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    #1

    Engine number

    Hi guys

    Can anyone help me out understand what engine is sitting on my bike? I have been now searching for hours without finding a answer. My bike is a Suzuki gs 450 from 1985. The confussions happens when I ordrer pistionrings for my bike, they always appears bigger then my originals. Never the right size. I then looked at my engine today and discovered that is says GS40X-105259? can anyone make something out of that number? It would be a lot easier to buy spareparts for the right engine, if the now sitting engine is been replaced by previous owner.

    Kindest
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    Tags: engine, model differences
    #2
    Pretty sure that's a GS400 engine
    Last edited by bwringer; 06-21-2018, 06:33 PM. Reason: Removed incorrect info that applies only to 4-valve GS400
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    Comment

      #3
      One clue to your engine size will be on the front, near the base of #1 cylinder.
      You will see numbers there that indicate the displacement.

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      Comment

        #4
        Yours is probably the European/Canadian model with the 4 valve per cylinder configuration. The easy way to tell is whether the caps on the end of the valve cover are rectangular or round. Round indicates the 2 valve per.cylinder model and the rectangle are the 4 valve per cylinder model. Your engine if I remember correctly should be a 4 valve.per cylinder 400cc motor. I don't think the 450 ever had the 4 valve per cylinder head.
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        Comment

          #5
          Hi Guys

          Thanks for the info. Regarding cylinder configuration, my cabs are two round. Hi Steve, thanks - I will check later today to locate the nummer.

          bwringer - many thanks for the information. I will try to located the number Steve is referring to and hope to figure out the size of the engine. If its a dead-end, I will then try to order new pistions for a gs400

          Comment

            #6
            35687084_10155988222629145_1355638759772651520_n.jpgHI Guys

            I have now tried to locate a engine number as Steve, but there is no number unfortunately. I did find other numbers, but not sure what to make out of them?

            Comment

              #7
              Here is a pic of the cylinder head 35836888_10155988222554145_2625060255851085824_n.jpg

              Comment

                #8
                Another pic 35552171_10155988222689145_7778002073009782784_n.jpg

                Comment

                  #9
                  Since you have the cylinder head removed. measure the bore. A GS400 has a bore of 65 mm. You have 4 valves per cylinder,, so it has to be a 400.

                  (the above was edited to eliminate any confusion)
                  Last edited by earlfor; 06-20-2018, 03:25 PM.
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                  Comment

                    #10
                    Am I seeing something different? I see 4 valves per cylinder, and a stamp on the barrels saying 399 cm3. Looks like a GSX400 engine to me.
                    1980 GS550ET

                    Comment

                      #11
                      Originally posted by steveb922 View Post
                      Am I seeing something different? I see 4 valves per cylinder, and a stamp on the barrels saying 399 cm3. Looks like a GSX400 engine to me.
                      OK then. He said when asked if he had round or square carb caps, his carbs were round. Confusingly he shows a pic of a 4 valve head which would have rectangular cam end caps. I will guess he didn't understand that and posted his were round meaning his carb bodies were round. If the head on the bike is 4 valve per cylinder, then it is 400 and the rings he needs are 65mm.
                      Komorebi-The light filtering through the trees.

                      I would rather sit on a pumpkin and have it all to myself than be crowded on a velvet cushion. H.D.T.

                      Comment

                        #12
                        Originally posted by earlfor View Post
                        OK then. He said when asked if he had round or square carb caps, his carbs were round. Confusingly he shows a pic of a 4 valve head which would have rectangular cam end caps. I will guess he didn't understand that and posted his were round meaning his carb bodies were round. If the head on the bike is 4 valve per cylinder, then it is 400 and the rings he needs are 65mm.
                        Fair point.

                        Mundtsar - it did look like you said you had round cam end caps. Just for absolute clarity, could you post a picture of the cylinder head from the side, ideally with one of the chrome caps attached?
                        1980 GS550ET

                        Comment

                          #13
                          Hi Guys

                          Thank you so much for the feedback. Here is a picture of the carburetor 35652141_10155988222564145_5823810292840136704_n.jpg

                          Comment

                            #14
                            I know is a bad picture, but can you make anything out of it Steve? 35805547_10155989328389145_380730270761877504_n.jpg

                            Comment

                              #15
                              Hi earlfor

                              Hmm, it could be? I did measure the position(only the pistion, without the rings), and it says 68mm - I used a measuring tape, so I guess its not 100% exact. Should I take in to considerations that the top and bottom pistion rings are wider than the actual pistion, when I measure ?

                              Kindest35645283_10155988222619145_4579977786709508096_n.jpg

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