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This is what i get for Jumpin Ship

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    #1

    This is what i get for Jumpin Ship

    Hole blown through crank case... the thread is posted here:

    Hole blown through crankcase
    http://www.kzrider.com/forum/2-engine/594644-hole-blown-through-crankcase#638207
    Bike is a 1980 KZ750-4. I am pretty sure overfilling the engine with oil was the cause. I just put CR Special 29mm carbs on and got the bike running mint,...


    Any drag race guys or anyone at all have ever seen anything like it? WHAT THE HECK?!?! Jeez i really feel like its time to get back on a gs
    John 3:16
    Tags: None
    #2
    The KZs are pretty damned tough. Like people were telling you on that forum, something went way wrong from the inside, most likely, and it was unlikely to have anything to do with overfilling the motor.
    "Thought he, it is a wicked world in all meridians; I'll die a pagan."
    ~Herman Melville

    2016 1200 Superlow
    1982 CB900f

    Comment

      #3
      see what happens when you lose the faith and become a heretic
      its karma !


      um no seriously did you figure out what part was making a disorderly exit from your engine via the crankcases ?

      ozman

      Comment

        #4
        lost a rod once...came out the front and made a big mess in the water box
        a friend went over and picked up a piece of the rod and burnt the fark out of his hand..silly goose!

        Comment

          #5
          Is that a roller or a insert crank?
          1984 GS1100GK newest addition to the heard
          80 GS 1000gt- most favorite ride love this bike
          1978 GS1000E- Known as "RoadKill" , Finished :D
          83 gs750ed- first new purchase
          85 EX500- vintage track weapon
          1958Ducati 98 Tourismo
          “Remember When in doubt use full throttle, It may not improve the situation ,but it will end the suspense ,
          If it isn't going to make it faster or safer it isn't worth doing

          Comment

            #6
            Just looked on a micro fiche that is a insert bearing motor and it may have a broken rod bolt. Looking at where the hole is it lines up pretty well
            1984 GS1100GK newest addition to the heard
            80 GS 1000gt- most favorite ride love this bike
            1978 GS1000E- Known as "RoadKill" , Finished :D
            83 gs750ed- first new purchase
            85 EX500- vintage track weapon
            1958Ducati 98 Tourismo
            “Remember When in doubt use full throttle, It may not improve the situation ,but it will end the suspense ,
            If it isn't going to make it faster or safer it isn't worth doing

            Comment

              #7
              Holes in both the top and bottom case halves in the same location. That pretty well rules out excess pressure or casting flaws. Fracture is from the inside out from the looks of the holes. Something was not very happy in there and tried to get out.

              Comment

                #8
                Spannering time ,dont run it till you opened it up and found out exctly what went on .Definately new cases will be needed here

                Comment

                  #9
                  Seen that on a mates Yamaha 650 after it developed a bit of a rattle/knock. The rod busted just below the piston and flogged around on the big end punching two very similar holes in a split second before locking the back wheel in the oil trail. Very handy thing to happen. I wasn't there when it was pulled down, but the mechanics theory was that the rod may have been cast with a partial crack and a dropped/busted valve impacting with the piston crown caused the rod to break.
                  Last edited by Guest; 06-30-2014, 01:01 AM.

                  Comment

                    #10
                    From the OP link: "She starts/runs on all 4 cylinders which rules out timing, pistons, rings in my book."

                    Comment

                      #11
                      Originally posted by GSX1000E View Post
                      From the OP link: "She starts/runs on all 4 cylinders which rules out timing, pistons, rings in my book."
                      Holy carp batman! Didn't read it. Just looked at the pics. Hard to believe... but?

                      Comment

                        #12
                        Resolution has come. I was totally wrong but I still think hydrolock was the case
                        John 3:16

                        Comment

                          #13
                          I don't think hydrolock could remotely cause that.
                          "Thought he, it is a wicked world in all meridians; I'll die a pagan."
                          ~Herman Melville

                          2016 1200 Superlow
                          1982 CB900f

                          Comment

                            #14
                            Hydrolock would not cause that.

                            But, if you experienced a mild form of hydrolock, as you stated from leaving the fuel on, then you may have caused damage that only revealed itself at a latter point.

                            This is probably the result of a minor bend in the connecting rod from the hydrolock.

                            My theory,
                            Daryl
                            1978 Gs1085 compliments of Popy Yosh, Bandit 1200 wheels and front end, VM33 Smoothbores, Yosh exhaust, braced frame, ported polished head :cool:
                            1983 Gs1100ESD, rebuild finished! Body paintwork happening winter 2017:D

                            I would rather trust my bike to a technician that reads the service manual than some backyardigan that THINKS HE KNOWS how to fix things.

                            Comment

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