How to correctly adjust a Jack Plate How to correctly adjust a Jack Plate
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    How to correctly adjust a Jack Plate
from Bassmar #13707  
10/24/2008 10:40:07 AM


 In two weeks time I will be having a 5" Manual Jack Plate fitted to my bassboat. I am running a 150 Opti on my 18' boat. Up till now it has been mounted directly on the transom. Once I take it out on the water I would like to adjust it to get the correct motor height for the optimum ride. Not having dealt with jackplates before I would appreciate some pointers as to what to look for when making the adjustments. For instance how will I tell if the motor should be lowered or raised? Should I set the motor at the same height that it is currently mounted on the transom?
I am sure this subject has probably been covered before and I would appreciate links to the relevant articles or threads.
Thanx in advance for any help.

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   Crash course from Fisherboy #10852  10/24/2008 1:31:27 PM
ot knowing what type of hull, prop, rpms, water pressure etc, here's what I would do:

1) Get some baseline numbers before the swap: measure the distance of the prop shaft in relationship to the pad; run the boat WFO and record water pressure, rpms and GPS speed.

2) After the swap, have the motor height the same as before; run it and record the same numbers. You should see the numbers change a little with just the addition of the setback.

3) You can then raise your jack plate to gain rpms and speed. But keep an eye on your water pressure. As you raise the plate the water pressure will go down.

You want to set it up so that you motor is turning the recommended rpms at WOT with enough water pressure.

If you lose water pressure, you can either plug a couple of the top holes, or drop it back down until you get the right readings.

If you gain too many rpms, but still have the right H2O, then you might want to try out a higher pitched prop.

If you have problems, come back and post: Boat, motor, prop (size and pitch), rmps at WOT, H2O pressure and the prop shaft distance from the pad. That info will help others help you dial it in.

   Water pressure from Bassmar #13707  10/24/2008 2:26:21 PM
Fisherboy thanx for the advice. What range should I expect the H2O pressure to be. At what reading should I be getting concerned that the engine is too high. I cannot find anything relating to this in the owners manual. The engine is a 2007 150 Optimax.

   Take a look over at the BBC (bass boat central) web site from billsp from NJ #10879  10/24/2008 2:58:17 PM
There's a lot of info for the different makes of boats and their setups. When you start making adjustments, only move the motor about 1/8" at a time, and put some markings on the two sliding surfaces so that you can tell where you are/were during the power runs.

   And hump Al's leg while you're there from Fisherboy #10852  10/24/2008 4:03:04 PM

Opti's run high volume / low pressure systems. I wouldn't run it lower than 12psi. 12-15 should be optimum.

It'll let you know pretty quick if it starts running low on pressure. Opti's give you about 10 secs after the first beep to shut it down or it will shut it down for you.

I think Guardian kicks in at anythign below 10psi. I'm not positive about the 150 though.

   Hump Al's leg??? from Bassmar #13707  10/25/2008 1:21:26 AM
Thanx for the info Fisherboy. There is nothing in the owners manual except to say that if the pressure is low the engine will shut down. Unfortunatly no figures are given.
Baffled by the humping Al's leg bit though.

   Al is the from Fisherboy #10852  10/25/2008 8:02:21 PM

owner of BBC

   jack plates from Jeff #10890  10/29/2008 1:21:39 PM
 When ever you move the motor back, it will have to go up. in a general sense, just to get in the ball park, the cavitation plate should not be in the flow of the water. It can be getting splashed but not in the flow. Watching the water pressure is always a good idea. from Jeff #10890  10/29/2008 1:23:58 PM
See if you can connect to this link.



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