Originally Posted by TOHATSU GURU
Within the same frame size there was/is no difference in gearing between the Tohatsu and its Nissan
It was more than 10 years ago that I looked into this, but IIRC, all Tohatsu clones (that I could find to compare specs, and I'm talking about 2 strokes only) except for the Mercury
had the same gear
ratios in the 2.5's and 3.5's. My Mercury 3.3 which was identical to my Nissan
2.5 (except that it had a pop off cowling and the forward/neutral shift) , without question had a different gear
ratio. I must have first found this in sales literature because the ratio is not mentioned in the manual, but I confirmed it back then by counting prop rotations while observing piston motion. I no longer have the Nissan, but the Merc is down in the garage, so I can check that one again.
I found all this surprising, even disturbing since I could get no reasonable explanation from Mercury. Even as to why the 3.3 designation. Only nonsense like "the gearing is lower so it can put out more horsepower". That came from the dealer after i asked him to look into it.