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    Confused by props

    I have a 16' Tracker that I just put an Evinrude 40 2 stroke motor on. The prop that was on the used motor was a SS 12.25X 15. I could get 4900 rpms @ 30.5 mph (GPS) with it. Looking for a little more speed I installed an aluminum 12.5X 13. Now I get 4950 rpms @ 29mph! How could this be? Should...
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    1990 Evinrude 40 hp

    '90 40 'Rude, trying to get the tach to work long enough to get the right prop on this thing. Rectifier is good, tach is good, only getting 1 to 2 volts AC on the gray wire at 1/3 throttle. The book says it needs 6v to work the tach. What is the verdict? Bad stator maybe? :(
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    Is it worth it to change?

    I have a 16ft Tracker with a Mercury 25 hp motor. Checking with the GPS it will push my boat 26 mph and gives no trouble at all. I have a friend that has an Evenrude 40 hp, a 94 model that has been in a storage building for over 10 yrs, he wants $300. for it. How much better performance should I...
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