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Jack plate and motor setup
#11127937
09/25/15 11:21 PM
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Joined: Jan 2006
Posts: 2,545
Biscuits
OP
Extreme Angler
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OP
Extreme Angler
Joined: Jan 2006
Posts: 2,545 |
I have a 1985 Skeeter Starfire 18.5". I'm currently running a 1984 150 Rude. My prop is a 14 1/4 x 21. Right now I am only getting 5000 rpm at WOT. When my boat is loaded with fuel or has full live wells I have a horrible hole shot. If I'm sitting light the boat jumps out of the hole but still can only get 5000 Rpm.
I'm thinking maybe the jack plate is set too high but to be honest I have zero idea where it should be set or what measurements need to be made to give you pros the info on where i am currently set up. I have a manual jack plate. It says Walker on the side of it. I know this motor has more to give so can one of you guys help me out here?
Current Cylinder Index is 42.
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Re: Jack plate and motor setup
[Re: Biscuits]
#11128035
09/26/15 12:36 AM
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Joined: Nov 2003
Posts: 259
YAMADOGGY
Angler
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Angler
Joined: Nov 2003
Posts: 259 |
21 PITCH? I HAVE A 150 YAMAHA WITH A THREE BLADE 25M ON A 186 CHAMPION W/ NO JACK PLATE AND ALL IS GREAT SINCE DAY ONE. 21 PITCH SEEMS IFFY. BUT IM NO PROP GURU
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Re: Jack plate and motor setup
[Re: Biscuits]
#11128174
09/26/15 01:53 AM
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Joined: Jan 2006
Posts: 2,545
Biscuits
OP
Extreme Angler
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OP
Extreme Angler
Joined: Jan 2006
Posts: 2,545 |
It's the same prop I had on my last Rude that was the same HP. Only difference being that motor was an 1988 year model. That motor made the boat fly. I'm wondering if messed the setup up a bit when I swapped motors. This current motor runs very well, just not getting the top end I think it can do.
Last edited by Biscuits; 09/26/15 01:56 AM.
Current Cylinder Index is 42.
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Re: Jack plate and motor setup
[Re: Biscuits]
#11128661
09/26/15 01:55 PM
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Joined: Jan 2005
Posts: 16,915
Pat Goff
TFF Guru
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TFF Guru
Joined: Jan 2005
Posts: 16,915 |
You have too many variables and not enough detail. If your motor was too high it would just blow the prop out and you'd just sit back in the water. Is that what it's doing?
Pat Goff Seadrift TX
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Re: Jack plate and motor setup
[Re: Biscuits]
#11128904
09/26/15 05:17 PM
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Joined: Jan 2006
Posts: 2,545
Biscuits
OP
Extreme Angler
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OP
Extreme Angler
Joined: Jan 2006
Posts: 2,545 |
No, it's just sluggish out of the hole when loaded with fuel. I took it out yesterday and she ran fine and hole shot was great. I have 3/4 tank of fuel in the front tank and 1/4 full on the rear. I filled the livewell up and the hole shot was carp. One think I should have mentioned is I am now running a 36v trolling motor so two more batteries for a total of four batteries. That has to be some of the issue I would think.
I think I asked my initial question wrong. Where should I do my measurements? Am I going from the transom to the back of the jackplate? I keep reading the middle of the prop needs to be 3 1/2" below pad. By pad I assume that is the very bottom of the boat nearest the transom?
My thought is that the back of the boat is too heavy with the added batteries and full livewell. It's kind of like spinning the tires in mud. I was thinking if I went down a pitch that would help with the hole shot when I'm fully loaded.
Current Cylinder Index is 42.
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Re: Jack plate and motor setup
[Re: Biscuits]
#11129104
09/26/15 08:03 PM
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Joined: Oct 2005
Posts: 20,755
kingdad101
TFF Guru
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TFF Guru
Joined: Oct 2005
Posts: 20,755 |
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Re: Jack plate and motor setup
[Re: kingdad101]
#11129292
09/26/15 09:46 PM
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Joined: Jan 2006
Posts: 2,545
Biscuits
OP
Extreme Angler
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OP
Extreme Angler
Joined: Jan 2006
Posts: 2,545 |
Kingdad thanks a bunch. I've looked at probably 25 web pages and this diagram is better than anything I've seen explained.
Ok from pad to prop I am sitting at 3' and 1/2"
My prop is 3.5" off pad.
Would a change of prop help my hole shot and top end speed?
Current Cylinder Index is 42.
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Re: Jack plate and motor setup
[Re: Biscuits]
#11129586
09/27/15 12:17 AM
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Joined: Aug 2011
Posts: 2,957
Bob Landry
Extreme Angler
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Extreme Angler
Joined: Aug 2011
Posts: 2,957 |
You can get in trouble arbitrarily changing props and could likely mask one problem with another. Once you get the pad to shaft measurement right, you want the pitch that gives you the motor RPMs at the high end of the operating range. Then start tweaking from there with vents, cup, etc. If I'm wrong, someone please chime in because that's what I have been taught in the short time that I've been in this game.
2015 Seaark 1872 MV CC Etec-90 Two Helix 12 CHIRP SI's, , MinnKota Riptide ST80/i-pilot Link, Bob's Hydraulic 2020 Robalo R200 CC, Yamaha 150
Bitter Gun Owner Bitter Clinger Armed Infidel
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Re: Jack plate and motor setup
[Re: Biscuits]
#11130060
09/27/15 03:58 AM
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Joined: Apr 2007
Posts: 2,165
Team Brown Stripe
Extreme Angler
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Extreme Angler
Joined: Apr 2007
Posts: 2,165 |
My Brother had a Starfire 175 with a merc 150 2 liter and with a 24 turbo prop and 6" jackplate would run low to mid 60s on GPS and no problems getting on plane. You might have a motor issue if you struggle to get on plane with a 21" pitch.
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Re: Jack plate and motor setup
[Re: Biscuits]
#11130162
09/27/15 11:11 AM
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Joined: Jan 2006
Posts: 2,545
Biscuits
OP
Extreme Angler
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OP
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Joined: Jan 2006
Posts: 2,545 |
I'll check my coils and power pack again. Maybe I have a weak spark on a cylinder. I just replaced two coils and a power pack earlier this summer. I have good compression on all six cylinders.
Current Cylinder Index is 42.
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Re: Jack plate and motor setup
[Re: Biscuits]
#11132149
09/28/15 12:51 PM
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Joined: Aug 2006
Posts: 7,182
steve@S2Marine
TFF Celebrity
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TFF Celebrity
Joined: Aug 2006
Posts: 7,182 |
if your at 3.5" below pad and a 21p prop that is giving the boat bow lift, then you may have some sort of engine problem.
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Re: Jack plate and motor setup
[Re: Biscuits]
#11209216
11/06/15 04:07 PM
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Joined: Jan 2010
Posts: 11,553
MrRoachie
TFF Guru
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TFF Guru
Joined: Jan 2010
Posts: 11,553 |
What about a hub slipping?
God loves you just as much as anybody else!!
Jesus offered His life as a gift for you. Please accept it!
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Re: Jack plate and motor setup
[Re: Biscuits]
#11209551
11/06/15 07:41 PM
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Joined: Jan 2006
Posts: 2,545
Biscuits
OP
Extreme Angler
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OP
Extreme Angler
Joined: Jan 2006
Posts: 2,545 |
I did a decarb and it helped out a bunch. The hole shot improved and I am getting better top end RPMs.
Current Cylinder Index is 42.
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