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Sticky Yellow Spark Plugs? And 1 carbon covered?

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    Sticky Yellow Spark Plugs? And 1 carbon covered?

    ~1980 GS550E

    So I am still trying to get this P.O.S. to run right. I have it to the point where it will run without having the choke on but the RPM's are all over the place. I get it to the correct Idle RPM's and it will SLOWLY die down until it stalls out (about 20-30 sec's) If I twist the throttle It livens back up but hangs up in RPM's then does the same thing. SLOWLY dies back down to the point that it stalls... Its NOT an air leak. The boots are new, as are the O-rings, Very tight. And the filters are also tight, no leaks.

    While pulling the spark plugs to see what kind of shape they are in (all 4 brand new and gapped to spec) with a total run time of only about 10 minutes... I discovered the following...

    Cylinder 1 - covered in sticky yellow residue
    Cylinder 2 - Slightly less sticky yellow residue
    Cylinder 3 - very small amount of residue but getting pretty covered in soot
    Cylinder 4 - no residue but COVERED in carbon

    In the below picture the Cylinder 1 plug has be cleaned quite a bit while being inspected, It was worse when pulled out...

    Any ideas on what the deal is?


    Last edited by Guest; 05-10-2014, 08:04 PM.

    #2
    I'd call oil as the sticky residue. Plug 4 looks like it's running rich. I'd guess maybe your head gasket is leaking oil into the cylinders.

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