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Yamaha 150 hp 2 stroke 1999 model. new water pump, new
Yamaha 150 hp 2 stroke 1999 model . new water pump, new thermostats installed ran motor in water barrel to test pump lots of water flow and pressure (15lbs) all appears to be fine . Problem is it acts… read more
Jason
Jason
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Vocational, Technical or Trade School
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I have a 1996 Mercury 225 EFI Serial number 0G373727 i
I have a 1996 Mercury 225 EFI Serial number 0G373727 i replaced the thermostats with 143 degree stats and my motor still reaches about 170 in temp is this correct or should i be using 120 stats for th… read more
Jason
Jason
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Vocational, Technical or Trade School
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I asked you a question a couple weeks back about the
Hello Charles, I asked you a question a couple weeks back about the operating temps of my 2005 150xr6. You helped me narrow down that the exhaust tuner was loose and that was probably causing my eleva… read more
Charles
Charles
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2005 Mercury 150 XR6. Have a question about operating
2005 Mercury 150 XR6. Have a question about operating temperature. Boat was new to me last year. Did not have a temp or water pressure gauge when I got it. I installed both this year so I could keep a… read more
Jason
Jason
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2005 Mercury 150 XR6. Have a question about operating
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Charles
Charles
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I have an overheating issue. My 2005 5.0L MPI has overheated
I have an overheating issue. My 2005 5.0L MPI has overheated twice after launching. I have replaced the water pump and thermostat and find that at low RPM the port exhaust has smaller flow than starbo… read more
Noel Schembri
Noel Schembri
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Answers from Two Experts requested: I have a 2000 Merc
I have a 2000 Merc optimax DFI 150 HP Outboard. Every time I take the boat out, within approx 20 minutes at low rpm (below 1500) the smart craft gauges signal an overheat condition. Also says check pa… read more
Jeff G.
Jeff G.
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Vocational, Technical or Trade Scho
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2001 merc 150 carb engine. S/n 0t395869 , engine is running
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Charles
Charles
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Hi Jason! I have a 2001 135 Optimax with the same problem,
Hi Jason! I have a 2001 135 Optimax with the same problem, overheat at idle, perfect temp at approx. 1500 rpm and above. The poppet valve is mentioned a lot on different sites, but as I understand, th… read more
Jason
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I have a 250 efi mercury 1999 and having overheating issue
I have a 250 efi mercury 1999 and having overheating issue at 3000rpm after 3 to 5 minutes of operation?? This has been going on for about a year we have tried everything , popped valves pulled the cy… read more
Charles
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i have a 1991 175 merc and the motor alarm came on so i changed
i have a 1991 175 merc and the motor alarm came on so i changed the water pump and tried it out and the alarm came on again its pumping water good through the exit port on the back of the motor and th… read more
Jeff G.
Jeff G.
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Vocational, Technical or Trade Scho
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Have a 5.7L I/O with raw water pick-up pump ( replaced impellar
Have a 5.7L I/O with raw water pick-up pump ( replaced impellar ), installed new 160 degree thermostat. Engines starts fine, temp goes to 180 and stays there. Can cruise for hours below approx. 2500 r… read more
Jeremy R.
Jeremy R.
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1989 Mercruser 5.7 L V-8, Alpha one drive. Engine starts to
1989 Mercruser 5.7 L V-8, Alpha one drive. Engine starts to overheat when pushing RPMS 3800 & above. It creeps slowly from 146 to 180 degrees or more. As soon as I back off the throttle it comes down … read more
James
James
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Vocational, Technical or Trade Scho
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2001 Merc 90 hp 2 stroke. Overheat alarm comes on at high rpm.
2001 Merc 90 hp 2 stroke. Overheat alarm comes on at high rpm. Changed impeller, stat, in the process of changing induction cover gaskets. If thats not it, what else could it be? Ran water through sys… read more
Jeremy R.
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I have a Mariner Optimax 135 HP outboard (2005 mod). The issue
I have a Mariner Optimax 135 HP outboard (2005 mod). The issue is that at idle speed the temperature stays steady at about 140 degrees F, and by increase the engine speed to about 1600 rpm the tempera… read more
Jason
Jason
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I have a 2000 150 Merc i have an overheating problem only
I have a 2000 150 Merc i have an overheating problem only when i increase speed slowy between 2500 RPM & 3000 RPM only on the port side of the moter If i increase speed fast it does not overheat… read more
Jeremy R.
Jeremy R.
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I have a 1996 225HP EFI Mercury Outboard it runs warm sometimes
I have a 1996 225HP EFI Mercury Outboard it runs warm sometimes 150-170 degrees and sometimes runs normal it if I am not watching sometimes it will set the overheat alam off but if I throttle back to … read more
TOM
TOM
Vocational, Technical or Trade Scho
196 satisfied customers
I run my boat about a mile,a solid alarm comes on.I idle a
I run my boat about a mile,a solid alarm comes on.I idle a few minutes,the alarm goes off.This keeps repeating itself.I have a new lower unit and new water pump,also I have good water pressure(18-20 l… read more
davesoutboard
davesoutboard
owner
Associate Degree
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Disclaimer: Information in questions, answers, and other posts on this site ("Posts") comes from individual users, not JustAnswer; JustAnswer is not responsible for Posts. Posts are for general information, are not intended to substitute for informed professional advice (medical, legal, veterinary, financial, etc.), or to establish a professional-client relationship. The site and services are provided "as is" with no warranty or representations by JustAnswer regarding the qualifications of Experts. To see what credentials have been verified by a third-party service, please click on the "Verified" symbol in some Experts' profiles. JustAnswer is not intended or designed for EMERGENCY questions which should be directed immediately by telephone or in-person to qualified professionals.

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