RedactedNarrative: The Operator of Vessel 2 was proceeding upriver, approaching his dock.  As the stern line came in line with the slip, the Operator of Vessel 2 attempted to shift the port engine into reverse.  The Operator of Vessel 2 reported that Vessel 2 was not responding as fast as usual, so the Operator of Vessel 2 increased the throttle for the port engine in an attempt to make the boat reverse into the slip.  Vessel 2 then lurched forward, heading further upriver, and turning toward Vessel 1 which was docked two slips up.  Vessel 2 struck the starboard stern of Vessel 1, causing damage to the outboard motor and motor mount of Vessel 1.  Following this collision, the Operator of Vessel 2 was able to maneuver Vessel 2 away from the docks, and slowed Vessel 2 down by running it up onto shore in a vacant are along the shoreline.  Once stopped, the Operator of Vessel looked below deck and found the shift linkage on the port motor had come loose, and was missing a bolt that held it in place to shift properly.  Damage to Vessel 2 in this incident included scratches on the gel coat in the bow area.