Love the idea of twin anythings and the mercury inlines definately have a cool factor , but...The tower of power inline six engines are/were about at the limits of their horsepower. Next to impossible to squeeze much more power out of them than the later years had in the 1986 1987 115hp which was more like 125hp at the prop. I have grenaded two of them trying to turn them trying to turn them up past 6k. Great on a light boat where the power to weight ratio of the inline is hard to beat. I have beat the old 150 inline six with any of my 115's as merc went to prop rating in 1985 and did not want the inline to compete with the 135 and 150hp V-6 sales so downrated it to a 115hp. Internally these engines had the same ports and pistons as the previous 140hp but had a better adi ignition system and much lighter and simplier power trim. The 1985-87 inline six was the best of them in my opinion but if you want to hotrod a motor there just isn't that much you can do to it.
Ridge is on the right track here as this xs 250 is going to fly.
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