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    #1

    Questions after an engine swap.

    Hi all. I have just swapped the engine on my 81 GS650, the fresh engine seems to smoke a bit but I do not think it has been run for over 2years so I will be keeping an eye on it. I did check the compression and it was about 150psi across the board, valve stem seals??
    I did have to use the stator, gear indicator switch, oil pressure switch and signal generator from the old engine. The holes where the screws fit through on the signal generator are slotted so it can be rotated slightly by a few deg, does this matter? does it alter the timing?
    Last edited by Guest; 10-05-2013, 03:02 PM.
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    #2
    Run it a bit- rings might be sticking from sitting idle. Any idea of mileage on this engine?
    When you can, get/borrow a timing light to check advance at idle and 4k rpm- those slots don't offer much adjustment, I'm guessing 5 degrees plus or minus.
    1981 gs650L

    "We are all born ignorant, but you have to work hard to stay stupid" Ben Franklin

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      #3
      I did about 20miles on her today, gave her a few beans for about a mile and came to a roundabout, as I exited it she started missing and was sluggish, she then picked up and was ok for the last mile home. I'm going to an autojumble tomorrow so will lookout for a strobe, I did have one but I can not find it, I did find a Gunsons Colortune that I had forgot I had got!!
      I also found a small oil leak on the oil filter cover, I think I will leave it for the moment until I have run her for a few miles.

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        #4
        You adjusted the valves on the new engine yet?
        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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          #5
          Originally posted by Nessism View Post
          You adjusted the valves on the new engine yet?
          Yes, before I fitted the engine, a couple were way out so I just swapped them around and got them so they were between 0.03mm & 0.1mm (I know one was at 0.03mm, which is a bit low, but I knew that I would be re-checking them after I had run the engine), so I am going to check them again tomorrow when I get back from the autojumble and get them all between 0.06mm and 0.1mm.
          Last edited by Guest; 10-05-2013, 03:50 PM.

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            #6
            Originally posted by UK-GT View Post
            Yes, before I fitted the engine, a couple were way out so I just swapped them around and got them so they were between 0.03mm & 0.1mm (I know one was at 0.03mm, which is a bit low, but I knew that I would be re-checking them after I had run the engine), so I am going to check them again tomorrow when I get back from the autojumble and get them all between 0.06mm and 0.1mm.
            All the gaps are now between 0.06mm & 0.08mm, put everything back together, pulled out the choke and she burst into life first time so the timing can't be that far out can it?
            I went to a very big autojumble today and the only timing light I could find was over £50, so I think eBay is my next port of call!!
            I'm going out tomorrow, but when I get back I will fill her up with petrol and take her for a good run.

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