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I have 5625s in my 65" YS powered Yak. Sometimes I feel like the rudder is a bit weak. You might stick a 5645 on the rudder. I plan to put something else on mine, I just hate having to pull the wires back through the tunnel.
Matt
Westy, I replied to your question through the PM you sent. But yes, should be a great choice and the karbonite gears are really nice as they have no slop at all.