I purchased a used 1974 6hp Johnson motor that seemed to run fine in a 5 gallon bucket. I tried the motor and it seems to have little power or speed for my 12ft jon boat. I had an old 3.9 Merc on it before that did a lot better. I found that the old and worn 2 blade prop was not correct and put a new 3 blade on and it barely moves and chokes the engine out. I put new plugs on the motor with no change in performance. I pulled the plugs and found water spray coming out of the lowre plug hole. Both cylinders have spark. I did run the motor on the top cylinder with the lower plug out but it sprayed a lot of water. I called the seller and left a message but haven't heard back yet. I this something common with this engine that can be fixed?
