Are you referring to the master link? It might be tight, but you should be able to slide the pins back into the two ends of the chain using two pairs of pliers. Put the master link onto one side of the chain first and then use the two pliers to pull the two pieces of chain together close enough to slide it in. Otherwise, loosen your motor mounting bolts to slide the engine back, connect the master link, then slide the engine forward again to re-tighten the chain.