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Re: 2009 KOP sprocket issues
I would like to echo the comment from V Block. Check VERY carefully to see if there are ANY obstructions that are preventing the chain from seating fully on the sprocket. The symptom being described fits the case where the pins of the chain are not fully seated, thus causing the effective pitch diameter of the sprocket to increase. This will cause the chain to "skip a tooth" periodically. Two frequent scenarios where this can happen include the protruding set screw mentioned above, and the case where the hub of the sprocket is pressed inside another object (such as a piece of tubing). Sometimes the outer tube is thick enough to cause the side plates of the chain to rest on the tube rather than letter the chain pins seat in the sprocket teeth. The pitch diameter is increased, the pins on the chain are only partially engaged with the sprocket teeth, and the chain will skip. We have been caught by this before - it is an easy thing to overlook.
-dave
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