I am also wanting to know how much an 85hp mercury of the same year weighs,I have a boat that is rated for 65hp it curently has the 50hp that is no good I found an 85hp at a good price.I have in mind to move the gas tank and battery to the front of the boat to help balance it out any input on this would be appreciated.also the boat is a 1970 glasstron jet flite