Re: Mercury 2.2 HP conversion to 3.3 hp!
I also have a 2.2 Mercury, around 1984, looks like it is made by Tohatsu. My Seloc manual shows that the bore and stroke is the same up to 3 hp, so I doubt changing the carb and removing the retrictor plate will give you 3.5 hp.
But horsepower ratings seem to be all over the map in these smaller sizes, sometimes it's measured at the prop other times at the crankshaft. The 2.2 is at least as strong as my old Johnson 3 hp I owned years ago.
I use my 2.2 on a square back canoe, very reliable, starts easily. However, it is 1 cylinder so it shakes at low rpm, enough to rattle the whole boat, the motor is constantly trying to turn itself because of the jack hammer effect from the 1 cylinder firing. The motor is fine though at higher speeds, it only weighs 28 lbs. To do it all again, I would look for another older Johnson or Evinrude 3 hp 2 cylinder 2 stroke in good condition, not much heavier and a lot smoother.
