Got the new 14t in over the weekend and same problem. I think it's the chain. Ordered a new non o ring. So if anyone is looking for a oring chain ill give you a good deal.
Is this a 520 or a 530? They are superficially similar but 520 is narrower. 520 is used for ATV's, and small motorcycles. 530 is used for larger displacement motorcycles for its strength.