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The carb'd 60 degree V-6 Johnrudes (150/175) are fairly light, and also worth considering. However I'd avoid the late 90's models, built when OMC was beginning to struggle before the bankruptcy. An engineer I worked with before I retired became the chief engineer at the OMC/BRP test center near Stuart, and told me that BRP really cleaned house and made dramatic improvements in quality when they took over, so he was very enthusiastic about the later motors.
However the main thing with any used motor is it's condition, compression, maintenance history, etc. Those factors and availabilty of nearby dealer support is probably more important than a particular brand; most motors are pretty reliable IF properly maintained.
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My`96 OP 150 weighs 365 dry. The pre `93`s had casting issues. Mid section cooling restrictions as well. They blew pretty quickly, so if they have more than 500 hours they should hold together. Things got really ugly at OMC around `98 as Denny stated. The importance of indexing plugs on early DI motors was lost on most. Pro or Joe Ficht.
The light old 2s Merc`s, Yam`s, and Zuke`s are good choices as well. Kinda like Toy, Gm, Fomoco, Mopar.
Your eyes and ears can tell you a lot, but compression and love are real.
Cheers,
GFS
Knock on wood.