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#11555428 - 04/20/16 05:12 PM Mercury help!!!!!!
itsanobsession Offline
Green Horn

Registered: 04/30/13
Posts: 15
Several months ago I blew my motor which was a 2002 Yamaha 225 ox66. Before it blew I was running 70mph at 6000rpm. Instead of rebuilding it I purchased a used motor from a guy in Baytown that owned his own little outboard service deal. The new motor is a 2006 225 optimax that's was converted to a pro xs. He showed me the Mercury diagnostics test, the motor had 400 hrs an not one problem showed up. The guy before me idled most of the hrs and only had 11hrs at 5900 rpm. Also did a compression Test was 95-97psi on all cylinders. The guy we bought it from also installed the motor. Before I even took it out I knew the prop that was on it was way to small. The first run I did with the small prop the boat ran 54mph at 5900rpm. The next day I borrowed a friends prop which was a 26p 3 blade fury. That day I ran 62mph at 5700rpm. When I got back to the ramp I noticed the motor was mounted way to low. So I got home and checked the motor height and the motor sat 4.25 inches below pad I raised it up to 2.75inches below pad with my manual jack plate took the boat out again with the fury prop and the boat ran 54 mph at 5900 rpm and the water pressure is still 20psi so I know it's not to high. Yesterday I put brand new spark plugs in the boat and it's still running the same. I'm out of ideas. Just wanted to see if anyone else could think of anything else.

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#11555456 - 04/20/16 05:28 PM Re: Mercury help!!!!!! [Re: itsanobsession]
Neal G Offline
Pro Angler

Registered: 11/06/09
Posts: 598
Loc: Texas
MPH based on GPS?

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#11555471 - 04/20/16 05:34 PM Re: Mercury help!!!!!! [Re: Neal G]
itsanobsession Offline
Green Horn

Registered: 04/30/13
Posts: 15
Yes sir
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#11555499 - 04/20/16 05:47 PM Re: Mercury help!!!!!! [Re: itsanobsession]
MikeSouza Offline
Extreme Angler

Registered: 03/13/08
Posts: 1729
Loc: Ardmore, Ok
What kind of boat?
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#11555518 - 04/20/16 05:58 PM Re: Mercury help!!!!!! [Re: MikeSouza]
Chris B Online   content
TFF Celebrity

Registered: 05/02/03
Posts: 6805
Loc: Prosper, TX
You need to start with giving all your setup info. Like, 2004 ZX225 10" jackplate 3.5 inches below pad running a clean 25T1 prop.
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#11555523 - 04/20/16 06:01 PM Re: Mercury help!!!!!! [Re: MikeSouza]
itsanobsession Offline
Green Horn

Registered: 04/30/13
Posts: 15
2002 zx225

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#11555680 - 04/20/16 07:45 PM Re: Mercury help!!!!!! [Re: itsanobsession]
bradnitro175 Online   content
TFF Team Angler

Registered: 07/11/08
Posts: 4363
Loc: Dallas,tx
Isn't that a 3.0 figured you'd get at least 120 on compression.not knowing what boat you have I'd drop it to 3.25 and see what it does.

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#11555689 - 04/20/16 07:50 PM Re: Mercury help!!!!!! [Re: bradnitro175]
itsanobsession Offline
Green Horn

Registered: 04/30/13
Posts: 15
So is 95. Psi consider low compression. If so what causes low compression
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#11555706 - 04/20/16 08:00 PM Re: Mercury help!!!!!! [Re: itsanobsession]
bradnitro175 Online   content
TFF Team Angler

Registered: 07/11/08
Posts: 4363
Loc: Dallas,tx
I wouldn't worry about it if there that even. i don't know much about skeeters maybe someone else can help you that knows that setup

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#11555710 - 04/20/16 08:01 PM Re: Mercury help!!!!!! [Re: itsanobsession]
lamoon78 Offline
TFF Team Angler

Registered: 05/05/10
Posts: 4391
Loc: Livingston Tx
Compression is on the low side for sure.

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#11555754 - 04/20/16 08:16 PM Re: Mercury help!!!!!! [Re: lamoon78]
itsanobsession Offline
Green Horn

Registered: 04/30/13
Posts: 15
It does die when I through it in neutral sometimes could that be from low compression too?

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#11555768 - 04/20/16 08:23 PM Re: Mercury help!!!!!! [Re: itsanobsession]
Neal G Offline
Pro Angler

Registered: 11/06/09
Posts: 598
Loc: Texas
At this point for this problem I would not be focusing on compression because you are turning 5700-5900 RPM. Being able to turn a 26 Fury 5700 RPM with a 225HP on a 20 ft boat is good. You should be able to get the proper height from a Skeeter guy here or go to the Skeeter group on BBC and they will be able to help you out.

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#11555780 - 04/20/16 08:27 PM Re: Mercury help!!!!!! [Re: itsanobsession]
JBellZX202 Online   content
Extreme Angler

Registered: 05/16/11
Posts: 1228
Loc: Grapevine, TX/Lake Fork
You put a Merc on a Skeeter. The Skeeter is rebelling!!!

Sorry about your bad luck. Are you sure it is a 225 pro xs powerhead?
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Keller Williams Realty (817)713-0508

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#11555796 - 04/20/16 08:32 PM Re: Mercury help!!!!!! [Re: JBellZX202]
itsanobsession Offline
Green Horn

Registered: 04/30/13
Posts: 15
Yeah I know I thought I'd like a Mercury better now I miss my vmax

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#11556636 - 04/21/16 09:56 AM Re: Mercury help!!!!!! [Re: itsanobsession]
B Reynolds Offline
Outdoorsman

Registered: 07/11/13
Posts: 44
Loc: Midland, TX
Beings the rpm came up and the boat slowed down I would say the prop is too high out of the water. 2.75 sounds pretty high, I would set it at 3.5 below the pad and try that. After you run it you can raise it .25 at a time till the boat starts to slow down.
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Billy Reynolds
2015 Nitro Z8 w/250 Pro XS
PB 10 lbs, 4 oz. at Alan Henry, 06/23/16. 11:30am.
New PB 11 lbs, 5 oz. at O.H.Ivie, 03/03/17. 6:16pm.

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