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Boston Whaler moved from a maximum horsepower rating to a maximum weight rating many years ago.
As Mercury introduced a new line of lighter inline 4 cylinder Verado motors the maximum horsepower motors available increased.

First came the L4 135, then the L4 150 was introduced, followed my the 175 and 200.

The 2015 model Montauk 190 has a maximum engine weight of 530 lbs. The Verado L4 200 motor is listed as weighing 510 lbs dry.

cf: http://www.bostonwhaler.com/Page.aspx...ntauk.aspx
cf:https://www.mercurymarine.com/en/us/e...75-200-hp/