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Jack plate question #13904137 02/27/21 04:55 AM
Joined: Oct 2005
Posts: 88
jig jerker Offline OP
OP Offline
Joined: Oct 2005
Posts: 88
I am helping a friend with his boat and it is a Triton 186 magnum aluminum with a merc 150efi and manual jack plate. For some reason his boat is breaking water about 5 foot in front of the windshield trimmed up. When everything was running correctly in the past, it would break water on plane at the drivers seat. I raised and lowered the jack plate at 1/4” intervals and test drove and nothing made a difference??
His tach is not working right now and I know that would help me to see optimal performance, but I thought surely An inch or so either direction would tell me something. The prop is not bent, but I wonder if the hub could be slipping that much ? The motor is not over-reving as far as I can tell ?
Thanks in advance for your input.

Re: Jack plate question [Re: jig jerker] #13904162 02/27/21 06:49 AM
Joined: Sep 2008
Posts: 112,877
hopalong Online Confused
Pescador Loco
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Pescador Loco
Joined: Sep 2008
Posts: 112,877
prop may need to be worked for bow lift, may need more pitch.

what set back is the jp? where did you start to raise/lower from, 3.5" below pad is normal starting point.


Last edited by hopalong; 02/27/21 06:49 AM.

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