sampled both 140 and 150 on the same boat Ribcraft 5.85 the 140 although sweeter marginally, felt like it was trying, the 150 just produced what felt like 50% more shove anywhere in the range. both boats sat with the same amount of tube touching the water at the transom.
as for weight I also have a 25kg 6hp on the transom maybe it makes a difference..maybe not, with the extra go it's irrelevent.
trying both boats back to back...no one i think would buy the 140, if they are after more of an effortless performance (800cc does make the difference),however if they are looking for a smoother/marginallyquiter ride the 140 may be the way to go..
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