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False overheating light and buzzer going into limp mode at
False overheating light and buzzer going into limp mode at speeds above 3000 rpm . I replaced impeller last year and just replaced the thermostats. Water pressure is 7 lbs at idle and 20 at speed. I c… read more
CalebA820
CalebA820
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2005 150XR6. Been dealing with some overheating issues for
Second opinion] 2005 150XR6. Been dealing with some overheating issues for quite some time now. Tried just about everything I can think of so looking for any other ideas. The problem I originally had … 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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Vocational, Technical or Trade School
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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
Charles
Charles
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I am getting a constant alarm on my 2005 merc xr6 150. I'm
Hi. I am getting a constant alarm on my 2005 merc xr6 150. I'm assumied it was the over heat alarm so I changed the thermostats. Also just had the impeller and lower unit serviced last week. Any thoug… read more
Noel Schembri
Noel Schembri
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Mercury opti max 1999 135 overheating thermostats opening poppet
mercury opti max 1999 135 overheating thermostats opening poppet valve opening but still overheating no poppet valve exhaust also looked at water jacket looked clean this problem is making nuts thank … read more
Jason
Jason
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Mercury engine cutting out at high RPM. What can be the issue?
I have a 2003 Mercury 300X. Engine cuts out at approximately 6,100 rpm, with a solid alarm and a flashing motor icon on the smart craft gauge.… read more
Charles
Charles
Certified Mercury Tech
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2001 merc 150 carb engine. S/n 0t395869 , engine is running
2001 merc 150 carb engine. S/n 0t395869 , engine is running warm at idle speed in gear temp around 160-180 and tell tail is weak,anything above idle speed all is good,temp is steady at 140-145 and goo… read more
Charles
Charles
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My 1988 V150 has a figure-8 shaped poppet valve cover--one
My 1988 V150 has a figure-8 shaped poppet valve cover--one larger hole where the poppet valve is and a smaller hole,both in the engine block --the small hole has a plug and o-ring that was just laying… read more
Jeff G.
Jeff G.
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The warning sensor goes off at about 3000 rpm and shuts down
The warning sensor goes off at about 3000 rpm and shuts down the motor on my 150 Merc Optimax. Oil reservoir is full, water pump is working fine, fuel level is fine. Getting worse about how often it h… read more
Jeff G.
Jeff G.
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I have a 1998 Promax 225 that has the overheat sensor going
I have a 1998 Promax 225 that has the overheat sensor going off we have tested the water temp with a thermometer and it is in the normal range… read more
Jeff G.
Jeff G.
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Vocational, Technical or Trade Scho
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I just bought a 2005 nitro boat with a 2005 Mercury 150 hp
I just bought a 2005 nitro boat with a 2005 Mercury 150 hp xr6. The motor looks brand new, cant be too many hrs on it. Anyway, I put it in the lake yesterday. It started right up but it took a while f… read more
Jason
Jason
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I have a 98 model 90 hp mercury there is a buzzer going off
I have a 98 model 90 hp mercury there is a buzzer going off when on a plane it goes off when you stop could you tell me what causes this… read more
Tan
Tan
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I have a 1994 175 hp merc. outboard on a 208 grady white. La
I have a 1994 175 hp merc. outboard on a 208 grady white. Last season I noted when I had to run at 50% throttle the engine temperature would climb. In one case in snotty weather when I could not get u… read more
Jason Forsberg
Jason Forsberg
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Have a 1999 Merc. 175 EFI on a Ranger r-83 and get e steady
Have a 1999 Merc. 175 EFI on a Ranger r-83 and get e steady horn at low rpm as in no wake areas. Only happens occassionaly and never at higher rpm. Water pressure gauges shows about 5lbs at the time. … read more
Master Tech
Master Tech
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i have a 2001 mercury outboard that at idle and up to 2500
i have a 2001 mercury outboard that at idle and up to 2500 rpms does fine but anymore then that a overheat like and continous buzzer comes on until i slow back down to idle. i have replace the water i… read more
Jeremy R.
Jeremy R.
5,362 satisfied customers
1997 Mariner V-6 135 hp. Serial # XXXXX used only in lake
1997 Mariner V-6 135 hp. Serial # XXXXX used only in lake water 225 hours on engine.Replaced Water pump, & T-Stats in May 2009. When running just off plane engine temp gauge spikes to 195-200 degrees.… read more
ROCKET
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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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