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    #16
    I think I got a good light and used a small magnet to spy down the hole.

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      #17
      Got semi lucky with the allen wrench. After pulling the head, I found it nestled up by the front chain guide lower shoe ahead of the crankshaft. It almost made it under the crank but got wedged. Anyhoo, it's out and now that I've seen the condition of the rear chain tensioner and cylinders, I'll be pulling the block.

      The cross hatching in the cylinders is still visible but on two of the cylinders, the rings are not contacting the cylinder wall around the entire circumference. Approx 70% contact 30% untouched cross hatching. Looks like a cheesy hone job that is not cylindrical. Don't think this will ever fully seat in.

      Now the question is, can it be properly rehoned and stay in spec using the current pistons. Which leads to: What pistons are in this thing in the first place. PO said it had a Weisco 1167 or 1168 whatever kit in it.
      The bore measure is 74mm which doens't jive with the 75mm bore requirement for that kit. 1134cc maybe. Piston tops say:

      4178PS
      XC

      Maybe a light, CORRECT, finish hone and a new set of rings? Otherwise more $$$ and go up to the 1168 kit with new pistons etc. OR (I usually don't like this option) put it back as is. It ran like a scalded dog despite evidence of shoddy machine work. No exhaust smoke, no fouled plugs. I never did a compression test which would probably highlight the issue though. AAARGH!! Decisions, decisions.

      Wheatdog

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        #18
        Since you are pulling everything down why not have everything measured properly and then make a decision? The cylinders should be checked for diameter, out of round, and taper. The pistons should also be measured so you can judge piston to cylinder wall clearance. It will be easier to judge the brand of pistons once they are out of the engine - post some photos if you need help with the ID. Make decisions on what to do based on what the facts tell you.
        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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          #19
          Originally posted by wheatdog View Post
          Got semi lucky with the allen wrench. After pulling the head, I found it nestled up by the front chain guide lower shoe ahead of the crankshaft. It almost made it under the crank but got wedged. Anyhoo, it's out and now that I've seen the condition of the rear chain tensioner and cylinders, I'll be pulling the block.

          The cross hatching in the cylinders is still visible but on two of the cylinders, the rings are not contacting the cylinder wall around the entire circumference. Approx 70% contact 30% untouched cross hatching. Looks like a cheesy hone job that is not cylindrical. Don't think this will ever fully seat in.

          Now the question is, can it be properly rehoned and stay in spec using the current pistons. Which leads to: What pistons are in this thing in the first place. PO said it had a Weisco 1167 or 1168 whatever kit in it.
          The bore measure is 74mm which doens't jive with the 75mm bore requirement for that kit. 1134cc maybe. Piston tops say:

          4178PS
          XC

          Maybe a light, CORRECT, finish hone and a new set of rings? Otherwise more $$$ and go up to the 1168 kit with new pistons etc. OR (I usually don't like this option) put it back as is. It ran like a scalded dog despite evidence of shoddy machine work. No exhaust smoke, no fouled plugs. I never did a compression test which would probably highlight the issue though. AAARGH!! Decisions, decisions.

          Wheatdog
          Yup 4178 is a wiseco 1134cc kit. If it ran good and didnt burn oil then why bother, IMO. Unless you are a perfectionist. Those hone lines are still visable after a lot of miles, how much depends on how coarse the hone was.

          Comment


            #20
            Rather than spending money on new pistons, you could always have a different block bored & honed CORRECTLY to your pistons & then install new rings.

            Option 1.
            New piston set approx. $550-600.00
            Bore & hone $200.00
            Sell 1134 pistons to recoup some money.

            Option 2.
            Replace block $50-100.00
            New rings $100.00
            Bore & hone $200.00

            I like 1166 motors, they make GREAT power! 140 RWHP is EASY with an 1166!!! Ray.

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              #21
              Rapid Ray,
              Looking at the cams, it appears they're a well worn set of stockers. One shaft says R1 and the other R2. Lift on the intake is approx .180" at the lobe and the exhaust is about .167". A few thou variations in base circles make exact measure iffy. Some slight grooving on the journals as well. I'm thinking about another set of cams. What's good for this displacement for street work and stock head if there is such a thing. Don't feel like getting into springs, shortened guides etc.

              Wheatdog

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