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I'd echo what C-dad said about the 4s running cleaner, quieter, no mixing. Didn't know about the 'any rpms' but that's great to know, since we also use it primarily for puttering in the dinghy.
If you intend to stay in the US, I understand that under pressure from EPA the 2s are being phased out? This may influence your ability to get parts & service down the road?
When we bought our 4-stroke 9.9 horse 3 years ago, IIRC the weight penalty was about 15% heavier than a similar 2-stroke.
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