2021 921 Pro Xp jackplate & trim settings

[sofakingbigbass]

Tried searching for this info but couldn’t find what I was looking for. Boat is single console, atlas jackplate, Merc 250 4 stroke, 24p 3 blade, with two power poles and 1 AGM 31 battery and 3 27 trolling motor batteries.

Just finished up my break in and trying to get acquainted with the jackplate (first time hydraulic user) settings for hole shot, handling and speed. Dealer told me to set jackplate around 11-12 and trim all the way down for hole shot which seemed to work so far with empty livewells, anything different if livewells and gas tank full?

Also have only been able to see 70.5 mph top speed (solo, empty livewells, water temp 70, and half tank of gas) which is less than I was expecting out of this boat. I don’t have exact RPM number when I topped out but I believe it was around 6000-6200. My front compartment is is basically empty and I think I have balance out the weight pretty good as I’m 265 lbs. Any advice on jackplate or trim settings to get more top end speed?

[PJ-Rohlf]

Seat time and play with it....

[sofakingbigbass]

indeed. I guess I was looking for some expert advice from the experienced members of this site just like asking about rod, lure, or even sirloin tip recommendations.

Seat time and play with it....

[PJ-Rohlf]

Well to be fair on hole shot...you can fill the live well and try it a few times with the jack plate in a few different spots. My experience has been to get her trimmed out and play with the jackplate from there.

Not trying to be a jackass but setups are different from person to person on how their boat is loaded with tackle, accessories, type and number of batteries. There are a lot of variables and it is easy to adjust and play around with a hydraulic plate than a manual.

[fishyfeet]

john crews has a good you tube video about using a hydraulic jack plate actually has good safety points especially about sharp turns with jack plate to high causing boat to hook

[haus9393]

Once you hit that 70mph range on a good straight start to bump the plate up or down from say 12. After a few seconds the boat will either gain or lose speed. You will find the sweet spot. Probably need to be trimmed all the way up too. And be able to handle chine like a pro. If you aren’t comfortable with it eventually you will be.

[Bartman]

JP around 12 should be very close. We need to know the exact rpms. for max speed...Once on plane, trim all the way up and them bump it down 3 times. If you have a smart craft gauge, the trim should be around 6.5. You should be seeing 73-76 mph solo

[Sansa]

I have the same exact setup. I start my JP at 12 then bump up to 16 at WOT. I trim no more then 3/8. If I keep my plate too low it walks really bad. My top speed is 73.9

[sofakingbigbass]

thanks man!

I have the same exact setup. I start my JP at 12 then bump up to 16 at WOT. I trim no more then 3/8. If I keep my plate too low it walks really bad. My top speed is 73.9