Decrease the pitch and you will move slower. However, you will achieve a higher rpm when you are wide open. Possible to over rev that little beast when you are cruising.
Unlikely that you have a tach on it to tell.
I have one of these on a 14' fiberglass skiff and it is a great little rig!
US Navy has a perfect record in aviation. The probability of survival is equal to the angle of arrival.
26 TV Weekender 04 Suzi 2012 175
37' Lafitte 87 Cummins 6BTAM2
23' Wellcraft Coastal 93 Johnson 225
50' Chandeluer Lugger 60 Detroit 671N
25' C- Hawk 87 Johnson 225
19.6' Aquasport 87 Evinrude 140
1092' Newport News 77 Twin Reactor (Fly One ROCKS)