I have a 5hp single cylinder 2 stroke Johnson made in 1999. It does 13 knots on my 3.1 metre aluminium open dinghy with just me in it but is just short of planing with 2 on board. Was this motor a restricted version of a 6hp and if so can I unleash the other 1hp to try and get it up there? I'm clutching at straws probably but it would make my life a bit less boring if it did. Running up and down the boat trying to get the nose down is good exercise but doesn't get you to your fishing spot quicker.