Go for a Tohatsu 6 HP and bump it to a 9.8, just carb swap, or buy a new/used 9.8 and sticker detuned it to a 6 HP. Tohatsu 6-8-9.8 HP engines are same 170 CC, just detuned from 9.8 to > 8 > 6. Better count with more power and much better water performance than a 4-5-6 HP will give.
A upgraded 6 to 9.8 or sticker detuned 9.8 to 6 is impossible to tell as all mentioned models are excatly alike. U decide.
Happy Boating
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