Thanks Steve..
So when I got to the shop today I double checked full throttle. 3580 RPM. I then used my phone with GPS speed app. I got a really consistent 6.2 MPH forward and 2.9 MPH in reverse. Ill check it against the 1211 tonight but I think the speed I am getting is close to what the 1641 is suppose to be.
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Cooperino 100, 104,125, 126, 2x129's, 804, 1211, 1641
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