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Just from what I’ve heard on here, if these things really run up to 9,000 rpm or whatever it is, won’t that make the motor just as loud as a 2 stroke. I know my motor is louder at 6000 rpm then it is at 3000.
If you check out the Yamaha “Hot Sheet” that James posted last week, you’ll see that the RPMs at WOT are in the 5000-6000 range, and that the HP ratings correspond to 5500 RPM.