Re: New jackshaft update.
Yes, stiff links can cause this skipping sensation but also a derailleur that is not adjusted will also cause this. Another thing to check is that the 2 chains aren't touching when in the taller gears. This will also cause the skipping sensation. I would suggest taking about 4 links out of your bike chain which increases the tension on the chain and reduce chain wobble that may be causing the chains to touch. You can also space the chainrings farther apart with washers. If your chain from jackshaft to chainring is too loose this will also cause the chains to touch.