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Jack plate adjustment #11848061 09/25/16 04:56 PM
Joined: Mar 2012
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Stick um all Offline OP
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I have a tzx195 with a HPDI 175. My RPM's seem a little low at top end. Should I play with my jack plate adj. is there a rule of thumb to raise or lower?

Re: Jack plate adjustment [Re: Stick um all] #11848264 09/25/16 07:05 PM
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gary purdy Offline
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Only rule is to raise it in small increments. Check everything else first like is throttle linkage getting to full throttle, is ignition timing correct and all fuel components in good shape. Any prop dings?


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Re: Jack plate adjustment [Re: Stick um all] #11848322 09/25/16 07:34 PM
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Stick um all Offline OP
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No prop dings. It's a new boat. I bought it back in February. I've had it in the shop already for a miss and power loss. The power loss was the result of a throttle cable clip popping loose under the cal. I put a zip tie on it to keep it from dong it again. I've had some trouble with getting the tac set correctly. New it was red lining at top end. The mec. Says that it was set incorrectly. He reset it and it was reading nothing at all. I played with it on the lake and got it reading again. It shows what the mec. Lap top did low RPMS. He told me to play with the jack plate or change the prop pitch. I'm still not sure f the tac is reading correctly. Top end shows 5300 rpm. His lap top showed 5600. Everything I've read says that it should be turning 6000.

Re: Jack plate adjustment [Re: Stick um all] #11849524 09/26/16 12:28 PM
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steve@S2Marine Offline
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set the prop shaft height at 3.5" below pad.
run the boat, and verify
max rpms
water pressure
gps speed
boat handling

if all is good, go up in 1/4 to 1/2 inch increments
until something falls off, then lower 1/4 until it all comes back.

if your not sure how to measure.
visit.
www.stevescustomprops.com
on the left side is a link that shows you "how to measure prop shaft height"


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s2marinesales@gmail.com
Blazer Boats, Gambler boats and Legend Craft Boats




Re: Jack plate adjustment [Re: Stick um all] #11849952 09/26/16 04:00 PM
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Pat Goff Online Content
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#1 Rule of setting up your boat correctly: Take it too far and bring it back. It takes time, and it's a pain, but it's the only way YOU will know exactly what's right for YOUR boat. No two props/hulls/motors/weight is identical, you have to find what right for your rig.

Raise 1/4" at a time until you lose: Lift, speed, or water pressure. Then back a click and you're dead on.


Pat Goff
Seadrift TX
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Re: Jack plate adjustment [Re: Stick um all] #11850394 09/26/16 08:19 PM
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Stick um all Offline OP
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Thanks. It seems I will soon be on the lake for test and tune.

Last edited by Stick um all; 09/27/16 06:48 AM. Reason: Spelling error
Re: Jack plate adjustment [Re: Stick um all] #11855980 09/29/16 06:42 PM
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Stick um all Offline OP
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Went up a full inch. 1/4 at a time. No change that I could tell, except the bow seems to ride a little higher. Try again another day soon.

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