Posts: 46
Location: Hayward, WI | The F70 is the same displacement as the 50 & 60. The F75 & F90 are about 37 ci larger. The problem is that you get 369# with a bigger 4-stroke. I would always max out a 4-stroke when going from a 2-stroke if the weight is more. I could never see going past a 60 Yamaha in a 4-stroke vs the weight difference. A F60 and F50 are 237# but the F70 is 257# and the F75 & F90 are 369#. So, I believe the 60 then comes the 90. For the 130# weight, you are getting an extra 30hp. An Optimax 75 weighs in at 375# with the 4-stroke slightly more at 399#. Also, the Opti 90 is tahe same weight as the 75 @ 375#.
So the F70 would work but I would put a 90 on it if it would work!!
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