motor weights, too much?

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damn you guys are good. thanks a lot. i love all the info on this site. on the bright side we all run boats w/ 20 year old hulls so the big $ item is the motor. 140 zuke sounds good, you really think i can get 45 out of it? i do like to go fast but 45 is doable (clean bottom, no bottom paint). as far as the 2 stroke v. 4 stroke, ive always (last 3 anyway) ran 2 stroke mercs and had good luck, but im thinking of going new and i dont like the opti, its gotten too much bad press. ive heard they worked out the kinks but id rather not be the lab rat for it. also, really nobody is running yammis on their seacrafts? all the bigger boats i fish run the hpdi and love it. just a weight issue?