2016 Z18 175 Pro XS New to me Boat.

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Cub48

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Hi Guys I just bought the Z18 a couple weeks ago. And have added a few things to the boat 6" jack plate, 1 eight foot power pole, added electronic ect. I have a few questions. I have owned boats most of my life so this is not a first boat. I have read about these questions on here and other places but have not found the answers that i am looking for. I am not wanting to run a 100 mph LOL. Just good all around performance. 1. Installed jack plate to install power pole. My pad was 3 1/4" the boat was porpoising when you slowed the boat down to like 25 mph, got it up to 62 mph was fine. Load was 1/4 fuel just me 100 lb tackle
 

Cub48

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Do I raise or lower the engine to stop porpoising at low speed. 2. My prop is a 24 pitch fury it does ok but the holes are open on a 175 ProXS 2 stroke how should this prop be setup 123 plugs or none. Need full fishing seat for front besides Nitro Dealer Most i found have lite gray mine are charcoal and black. May have to buy two to get match Cub48
 

Tim_C

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Trim motor down or increase speed to stop porpoising. I am not familiar with jackplate performance, but if you have a hydraulic jack I would guess it should go down a bit.

Is your motor a 2 stroke or 4 stroke? If it's a 4 stroke my understanding is the prop vents should plugged.
 

Matt Hendon

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Hi Guys I just bought the Z18 a couple weeks ago. And have added a few things to the boat 6" jack plate, 1 eight foot power pole, added electronic ect. I have a few questions. I have owned boats most of my life so this is not a first boat. I have read about these questions on here and other places but have not found the answers that i am looking for. I am not wanting to run a 100 mph LOL. Just good all around performance. 1. Installed jack plate to install power pole. My pad was 3 1/4" the boat was porpoising when you slowed the boat down to like 25 mph, got it up to 62 mph was fine. Load was 1/4 fuel just me 100 lb tackle
Mine was doing the same, I started trimming down when slowing down and took care of the problem.
 

Cub48

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I had my P-P at 3 1/4" and when i would slow down it would start to porpoise. Yep i know to trim down but i had to trim way down to stop it. It is a 2 stroke 175 PRO XS my question is do I move motor up or down to help the porpoise. Thanks for the reply Cub48
 

jerry shack

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First thing about hyd. jack plates in shallow water lets say 2' jack plate all the way up and motor trimmed all the way in. For regular running and hole shot you are going to have to find the sweet spot for that, all the way down or half ect. And when running slow you will need the jack plate all the way down to pull the nose down and trimmed all the way in. For top speed run the jack plate up about a 1/4" at a time and trim the motor to have no more then a rooster tail above the cowling. Also keep an eye on the water pressure gauge. That fury prop runs best with no plugs .
 

Tim_C

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I had my P-P at 3 1/4" and when i would slow down it would start to porpoise. Yep i know to trim down but i had to trim way down to stop it. It is a 2 stroke 175 PRO XS my question is do I move motor up or down to help the porpoise. Thanks for the reply Cub48
I have the same Motor on my Z18. Your trim controls the porpoising. You answered your own question. The jackplate is used primarily to allow you to get on plane and off plane in shallower water. And you can get greater fuel efficiency when raising the motor in relatively stable water. You lower it for better control in heavy seas. See the links below. Yamaha Outboards.

 
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Hi Guys I just bought the Z18 a couple weeks ago. And have added a few things to the boat 6" jack plate, 1 eight foot power pole, added electronic ect. I have a few questions. I have owned boats most of my life so this is not a first boat. I have read about these questions on here and other places but have not found the answers that i am looking for. I am not wanting to run a 100 mph LOL. Just good all around performance. 1. Installed jack plate to install power pole. My pad was 3 1/4" the boat was porpoising when you slowed the boat down to like 25 mph, got it up to 62 mph was fine. Load was 1/4 fuel just me 100 lb tackle
I have this 2019 Z20 in the picture, it has a 225 ProXS when I first received delivery to my new boat I got a box full of stuff with it. In that stuff was a bag with different plugs in it. After calling Mercury Marine I found out that those holes you are referring to in the prop help with your hole shot. I run mine without any plugs, the holes are all open. With the trim all the way down and my Atlas Hydraulic jack plate raised 1/2" my boat explodes out of the hole shot, it nearly comes out of the hole on plane. "If it's not broke don't fix it" This boat according to my dealer is the fastest Nitro he has ever test drove. He says he had it at 78 mph and it has more. I have 2 10' Talon's on my boat it's 20'2" with a 112 thrust MinnKota Ultrex on the front. The porpoising issue is something you need to tinker with. Best results for myself are to gradually slow down rather than a faster decline. I also have the ProTrim levers for the trim and jack plate on the steering column, this makes it very easy to trim down as I decelerate, I have a hotfoot so no need to have the hands on the shifting lever. Hope this helps you..
 

Cub48

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Thanks everyone for your replies. I know getting use to a different boat is something that will take a while, learning all the different thing that make the boat feel like it is supposed to. Like i had a 150 Yamaha last boat and getting use to a Mercury is a lot different. I am just trying to get everything setup like i want it then won't have to mess with it. Going to put a hole shot plate on i have a buddy that can make me one. I adjusted hot foot cable yesterday, put boat buckles on, going to adj motor up 1/4" and will be done. Cub48
 

HTW

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I have the exact same boat. My mid shaft to pad is 3 1/2 inches. Pad to top of cavitation plate is 4 inches. I have an 8 inch jackplate. I porpoise as well, but trimming and quicker speed smoothes it out. Nitros at this length 18.8 are know to porpoise somewhat. Many friends have had the shorter boat and it happens to some degree. Change prop to a 4 blade maybe. I run 65-67 WOT
 
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