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I have a 70 hp two stroke on the back of my '06 170. I was told by the dealer that although the 4 stroke is quieter and more fuel efficient it is also a bit larger and heavier than a 2 stroke motor. What you gain in power you lose in weight. You can get a 75 hp 4 stroke but that is the maximum hp for the boat. My 70 2 stroke has more than enough power and i am very pleased with its performance.
CJ
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