25 series chain skipping

[thefro526]

Originally Posted by JamesCH95

It almost sounds like you've got a metric/english mix-up. I.e. ISO 6mm chain w/ ANSI 25 sprockets. The pitch is VERY close (0.25in vs 0.24in) which would probably cause the symptoms you're seeing.

This could be true, but if the chain and sprockets were both bought from AM, how likely is it that there were a 6mm and #25 mix up?

It almost sounds like the cut on the sprocket teeth needs some finessing, we made our own sprockets for an off-season proto and had similar issues. A bit of careful file-ing of the tooth profile did the trick.

Another thing to look for is 'squeezed' link in one of your chains. I've found that it's very easy to squeeze #25 chain during the breaking process to the point that it's too narrow to properly sit on the sprocket teeth. You can open it back up with some steady hands and some pliers or just make a new chain.