Hello folks,
I have a technical question for you folks. I have a 1968 Larsen runabout, rated for a max motor of 55hp. (According to the plate). I have a 1976 70hp Johnson I was thinking about mounting on the boat. I know that typically, in this situation, a 70hp is too much motor. However...I was told by a mechanic, that with the changes in horsepower from 1968 to 1976, that technically, in 1968, a 55hp was the equivalent of a 70hp in 1976. Is this true? Am I crazy for thinking about putting this motor on this boat? If it is true about a 1968 55hp motor being the equivalent to a 1976 70hp motor? Is there documentation of this, so I can be legal? I know the Coast Guard would frown on a 70hp motor mounted on a boat rated for 55hp. However, if I can prove the above, I may be able to move forward with this motor. (No pun intended).
Thank you very much for any help you may be able to provide!
Drew Doman
Portland Or.
I have a technical question for you folks. I have a 1968 Larsen runabout, rated for a max motor of 55hp. (According to the plate). I have a 1976 70hp Johnson I was thinking about mounting on the boat. I know that typically, in this situation, a 70hp is too much motor. However...I was told by a mechanic, that with the changes in horsepower from 1968 to 1976, that technically, in 1968, a 55hp was the equivalent of a 70hp in 1976. Is this true? Am I crazy for thinking about putting this motor on this boat? If it is true about a 1968 55hp motor being the equivalent to a 1976 70hp motor? Is there documentation of this, so I can be legal? I know the Coast Guard would frown on a 70hp motor mounted on a boat rated for 55hp. However, if I can prove the above, I may be able to move forward with this motor. (No pun intended).
Thank you very much for any help you may be able to provide!
Drew Doman
Portland Or.