That PowerTech REB3 is the best for the 25 tohatsu.
As for the Merc, what pitch do you run now, what rpm's are you turning.
Is the Merc stock? Too many unknowns to answer with any degree of certainty.
The absolute best all around prop for the 13 spline motors, 40/50/60 Merc, tohatsu 40/50, Yamaha 40/50, is the Yamaha Black Painted Stainless Steel Propeller. Problem is that it is only made in 14, 15, & 16 pitch.
FIRST, you need a tach. Propping a motor without one is a complete guessing game. It's like building a box with no measurements.
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