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How to diagnose burnt valve

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    How to diagnose burnt valve

    Curious to know how I can diagnose a burnt valve on my 79 gs425.

    Thanks.

    #2
    Bad compression that doesn't increase when you pour a teaspoon of oil in the cylinder. To do a proper compression test you should have a warm engine and hold the throttle wide open. Of course this assumes the bike runs. Oh, and always adjust the valves before doing a compression test otherwise the entire exercise is a waste of time.
    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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      #3
      Google leak down test.
      Current:
      Z1300A5 Locomotive (swapped my Intruder for it), GS450 Cafe Project (might never finish it....), XT500 Commuter (I know - it's a Yamaha :eek:)

      Past:
      VL1500 Intruder (swapped for Z1300), ZX9R Streetfighter (lets face it - too fast....), 1984 GSX750EF, 1984 GSX1100EF (AKA GS1150)
      And a bunch of other crap Yamahas....

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        #4
        Thanks all. Just soaked carbs and did rings and she fired up pretty well. I'm going to do valve adjustment this week and then will try compression test. I already noticed plug in cyl 2 is oil fouled but will swap plugs out after adjustment and probably be back for more help. Thanks.

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