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ZZR250 Carbie Problem??

Discussion in 'Technical and Troubleshooting Torque' started by josh_182, Nov 15, 2007.

  1. Hi guys, a few months back, my bike stopped going, in the end found out there was a hole in the top of one piston n it had dropped indside the casing. Just had the whole thing rebuilt but there is a flat spot in every gear on low RPM, could this just mean that the carbies need a tune n could have caused the problem before by running to rich into one cylinder or something??

    Any help appreciated, thanx guys :)
  2. where the carbies cleaned and synchonised after putting them back on the engine?

    If they were lying around with petrol in them they may have gummed up a little.
  3. Just go straight back to whoever rebuilt it for you. They might not do it for nothing, since tuning/cleaning carbs is not automatically part of an engine rebuild...


    ...it was a carb related fault in the first place.

    A piston holes because either the timing is out (usually too retarded = runs hot, sometimes too advanced and causes detonation = pinging).

    But since most bikes have electronic ignition (oh...you didn't have the wrong heatrange spark plug fitted, by any chance?) that leaves a fuel problem. A clogged filter will restrict fuel flow and cause leanness = overheating = detonation if it's really bad, and under load.

    You could have even had a jet blockage. Didn't you find out what caused the problem in the first place? It could happen again if not rectified. Holes in pistons are completely avaoidable - they are definitely a common or required part of modern motorcycling!

    Best regards

    Trevor G