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Jack Plate Installation

General boating discussion (boats, motors, marine electronics & accessories)

Jack Plate Installation

Postby duckbuckhunter36 » Thu Jul 26, 2012 10:32 am

I have a manual jackplate that I am wanting to install on my 16' Aluminum boat. The motor is a 25 yamaha (2-stroke). How do I know what height to set the motor? Been told there is a way to measure from cavitation plat to bottom of boat, but different explanations have been fairly vague. Any assistance would greatly be appreciated.
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Re: Jack Plate Installation

Postby Ray » Thu Jul 26, 2012 7:33 pm

Without a jack plate, the cavitation plate needs to be at the bottom of the boat.
With a jack plate, I'd run her around 3 inches above the bottom of the boat and test it.
Then go up another inch, test... ect., until you find where most of the lower unit you can get out of the water, without cavitating or you can take off good.
There are different heights for motors, depending on how far it is set back from the transom.
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Re: Jack Plate Installation

Postby WestCoveWarrior » Fri Jul 27, 2012 9:07 pm

Mount it at home about where you think it should be, then head to the boat launch with a buddy, set of wrenches, and a GPS. Run it and see how it does, go back to the launch and make adjustments. It'll save you alot of time and gas
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Re: Jack Plate Installation

Postby duckbuckhunter36 » Mon Jul 30, 2012 5:41 am

Thanks Ray & West. Both of those replies are my exact intentions. I just needed to find out a good starting point to set the motor to eliminate extended adjustment time & frustration. Also, I have a 12v 55 lb. thrust rip tide trolling motor, any advice on what most ideal battery is to use? Happy fishing...
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Re: Jack Plate Installation

Postby gerald » Mon Jul 30, 2012 10:12 am

I have found that the Walmart, Academy and Battery Warehouse batteries all last about 2 years. They all cost about $ 70. I keep my battery charger connected all the time.

A couple of months ago I bought a NAPA battery [NAPA no. 8302] for $ 90 after I got this email. I hope I get the same battery life as this guy. You can get information about them from there web site.

I still have the two from 2006 on my boat since I posted. I'm completely satisfied with the batteries and I got them from the NAPA in Sulphur. The battery maintainer that is hooked up to them stays plugged in 24/7 and is only unplugged when fishing. I have a NAPA battery on my RV and it has been on there since I bought it in 2005 and the RV stays plugged just like the boat.
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