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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
Marine Mechanic
Vocational, Technical or Trade School
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I have a 1992 Mercury 175 thats been upgraded to a 200 hp
I have a 1992 Mercury 175 thats been upgraded to a 200 hp efi power head with thermostats (still has carbs). I recently hit a sandbar and clogged the engine. I believe I have flushed all of the sand o… read more
Noel Schembri
Noel Schembri
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Diploma
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I have a 30 foot twin engine Donzi with twin 2000 225
I have a 30 foot twin engine Donzi with twin 2000 225 horsepower Mercury EFI has the port engine overheats anything over 3500 RPMs I've done a compression check put new impeller flush the whole engine… read more
Jason
Jason
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I have a 2016 Mercury Verado 225 (41 hours). I purchased
I have a 2016 Mercury Verado 225 (41 hours). I purchased last week used. Receiving Smartcraft Fault #241 - Overtemp - "Charge air temperature is above specified limits. Reduce throttle demand." When a… read more
Charles
Charles
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Water is coming from pee hole but not from the exhaust hole
Water is coming from pee hole but not from the exhaust hole in mercury(###) ###-####salt water series outboard. Motor idles fine at 1500 Ross and higher motor temp goes higher. Can only run on plane f… read more
Tan
Tan
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I replaced the water pump last year because the water stream
I replaced the water pump last year because the water stream was weak and the motor ran a little on the warm side. After doing so everything seemed fine. Ran normal. But at higher RPM's it would run h… read more
Jason
Jason
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Vocational, Technical or Trade School
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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
Charles
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I have a 1999 Mercury 200 efi thats driving me crazy. When
I have a 1999 Mercury 200 efi that's driving me crazy. When I get on the lake I will run up the lake at either flat out or around 4000rpm, no problems. total run time about 20 minutes. I'll fish a are… read more
Jeff G.
Jeff G.
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Vocational, Technical or Trade Scho
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I have a 2001 150 optimax it has been running fine until yesterday
I have a 2001 150 optimax it has been running fine until yesterday I got a temp alarm. The gauge read around 200 degrees. I put it in neutral the temp dropped to 180 the alarm stopped. When I reengage… read more
Shane Creekmore
Shane Creekmore
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High School or GED
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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 1996 mercury 250 efi outboar . runs good but when
I have a 1996 mercury 250 efi outboar . runs good but when I start it cold the temp alarm sounds and the gauge is high. I shut the engine fo a minute and restart , the gauge comes down to normal and t… read more
Jeremy R.
Jeremy R.
5,362 satisfied customers
I have an Evinrude 2000 70hp 4-stroke EFI outboard with less
I have an Evinrude 2000 70hp 4-stroke EFI outboard with less than 350 hrs. At around 3800 rpm overheat light comes on and rpm's drop to 3000 rpm, by design. When I stop motor I can restart immediately… read more
Jeremy R.
Jeremy R.
5,362 satisfied customers
2004 had a new 350 mercruiser installed in 1980 boat always
2004 had a new 350 mercruiser installed in 1980 boat always ran at 180 heated up to 220 upon stopping told by installer of motor that it was normal. This year heated up to 200 would not cool down, sho… read more
mercmastertech
mercmastertech
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1999 454 mag oil pressure good water temp good outdrive
1999 454 mag oil pressure good water temp good outdrive fluid level good can drive all day as long as I keep it below 3000RPM but as soon as I go above 3000 RPM I get alarm clean spark arester new gas… read more
ROCKET
ROCKET
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What is the normal operating temperature of a 1992, 135 hp
What is the normal operating temperature of a 1992, 135 hp mercury outboard, serial # "0D144350" from idle to Wide-open-throttle? I have asked 3 different outboard mechanics and am getting two answers… read more
lndy650
lndy650
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2001 mercury 225 EFI with steady alarm when getting on plane
2001 mercury 225 EFI with steady alarm when getting on plane water is circulating fine fine. Engine will loose power. I must turn engine off to kill alarm. I can run the boat along as I don't try to e… read more
ROCKET
ROCKET
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I have a 200EFI mercury. My engine runs fine above 4,000 rpms
I have a 200EFI mercury. My engine runs fine above 4,000 rpms and below 3000rpms. The problem is at 3500rpms my engine overheats. I have changed the water pump and this does correct the problem for ab… read more
ROCKET
ROCKET
MASTER CERTIFIED TECH
Vocational, Technical or Trade Scho
426 satisfied customers
I have a 2002 Mercury 225 EFI on a 23 Sport Pro-Line ...
I have a 2002 Mercury 225 EFI on a 23 Sport Pro-Line Center Console. It runs hot according to the temp guage at around 185 degrees when running around 4000 RPM. When idling it runs around 160 degrees.… read more
Captain Dave
Captain Dave
Charter Captain & I.S. Director
Master's 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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