Swapping a spec motor for another spec motor will not get you any more speed, you'll have more rpm but will have to swing a smaller prop.
Putting a UL-1 motor in mine upped the speed by ~3 mph without any tuning (although I was careful about not running too long). Raising the prop would likely have increased the speed a bit more.
A new SAW record was just set at 67 mph with a spec motor and near stock prop on a 26" cat.
Tony used a UL-1 motor and a special, aggressive prop tweaked by a master prop tuner - and a lot of setup tuning on his H&M Drifter - to set the record under perfect water conditions. Too, that's a SAW setup, not one for five minutes of sport running. An interesting side note was that last Fall he couldn't get much over 50 with the same setup and a 'regular' prop. He was ready to quit until he changed to a special prop loaned to him. That upped his speed by well over 10 mph - no other change.
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