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Welcome aboard WhalerCentral.

I owned a Montauk 17' for 15 years with a 70hp 2 stroke on it.
So for me, a 70hp would be the smallest I personally would want.
It was great for me 90% of the time as even with the 70hp, you could not always go full speed due to water conditions, etc.

My first choice today would be the Yamaha F70 4 stroke as it is the same weight as my 1985 Evinrude 70hp.

Look through our Articles section and view the "Current Engine Choices and Weights" charts.
Here is for the 16/17 models.
http://www.whalercentral.com/articles...ticle_id=5

For those that want more in the 90hp range, then the lightest would be the E-Tec 90 2 stroke with others not too far behind.