The only thing I have ever heard about the Zuk 140's is that they get a salt build up around the oil coolers over time. It is easy to maintain - if you know about that tendency to make salt there. You need to talk to someone who has more experience than my hearsay. I'm pretty sure I'm puttin a couple of Zuk 115's on a 25 Bert I'm redoing. Plenty of propeller disc surface, buckets of geared down torque and I understand they are bullet proof.
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