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  • #1

    piston top deposits

    I had to pull the engine down for a bad crank seal, pulled the top end while I was at it.

    Pistons, sleeves rings all look good, but top of pistons have black (and gray) hard deposits. looks like carbon, but glazed.

    #3 is dull gray, #1 &#2 are black. No pitting,

    Diagnosis? normal, or carb issues?

    How to remove? polish? solvent?
    Tags: None
  • #2
    Re: piston top deposits

    No one can guess without good pictures.
    SBT Tech Support is here to help with your problems.
    We try to answer each question quickly and accurately.
    Please do not use Private Messaging for Tech Support, use the forums.

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    • #3
      Re: piston top deposits

      as requested. picture attached.

      Attached Files

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      • #4
        Re: piston top deposits

        #1 is front, on the left of the pic. #2 & 3 look like they were either getting washed or running rich. Either way you don't need to do anything to them.
        SBT Tech Support is here to help with your problems.
        We try to answer each question quickly and accurately.
        Please do not use Private Messaging for Tech Support, use the forums.

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        • #5
          Re: piston top deposits

          Thank you for your response.
          Last edited by gp1200joe; 08-30-2007, 08:14 PM.

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          • #6
            Re: piston top deposits

            one more thing, now that it is all back together, do I need to go through the full break-in ritual, or just take it easy for a tank-full?

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            • #7
              Re: piston top deposits

              If you is prety much running what you started with, I'd just run around fir first tank, no extended WOT if new rings, vary the load.
              ***1100 Venture***<br />OE head mod-- by Riva Yamaha<br />Wiseco (+ .5mm)<br />True-welded crank<br />Riva F/A+ Jet kit<br />Boyeson Power reeds<br />Riva 1100 CDI<br />NGK plugs- BR8HS<br />R&D Aqua-Vein<br />Solas 14-21 Super Camber//Impros<br />Riva rideplate<br />Amsoil "AIO" @ 50:1 pre-mix, currently KLOTZ Ski-Craft<br />MOBIL-1 grease in the pump<br />Sears Diehard<br /><br /> Dream-meter shows 65---- GPS says 54.2 mph best, 9/14/02 @ 850 ft elevation

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              • #8
                Re: piston top deposits

                thanks, did that, seems fine, idles better than before. can't wait to run out the 32:1 with seafoam, and get back to regular mix. should run even faster than it did last night.

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