I owned the same boat as you the 210SS....trimming that boat could not be any easier. Start with trim all the way down, as you get on plane (and at speed for the current throttle position) start bumping the trim up, with every bump the boat should speed up without more throttle, when the boat stops speeding up with every bump of the trim you will feel the prop start to "slip"....then bump the trim back down one time and that is your sweet spot. The "feel" of this process is most easily felt at full throttle...and if you are at 5+ hrs on your boat...it's time to stretch her legs a bit... get her nice and warm for about 10 min. then it is more than ok to "drop the hammer" for a few minutes....
With evey bump in trim, your speed and RPM will increase (without touching the throttle)....when your RPM increases and speed does not or slows, bump the trim down just a bump.... This will work with any boat load, and with the exhaust on that boat you can certinally hear the RPMs changing...

Good Luck!
*trim gauge is just a general guide....propper trim at speed is "feel/hear" because with different loads/conditions "propper trim" is always changing.
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Paul F.
So many lakes so little time!!2008 Four Winns 210 SS -- Red
5.7L Gi/SX - Volvo - 14 3/4 x 21 ss prop (62 mph)
