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2007 Optimax 150, ser # 1B490525. Getting a steady alarm at
Getting a steady alarm at about 2400 rpm. Reducing rpm, even slightly immediately stops the alarm. Easing throttle back up to 2400 restarts the alarm. … read more
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Jason
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Steady alarm after idling for ten minutes ear muffs on
Steady alarm after idling for ten minutes ear muffs on steady stream 150 hp optimax … read more
Charles
Charles
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I have a 2000 nitro with the optimax 135.. put boat in water
i have a 2000 nitro with the optimax 135.. put boat in water today, ran great, stopped and fished for a while.. tired to go to another spot, motor started to plane out n then alarm came on.. ive been … read more
Charles
Charles
Certified Mercury Tech
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I have an 06 merc 150 optimax. A steady alarm comes on at
I have an 06 merc 150 optimax. A steady alarm comes on at around 2500 rpm.I replaced the water pump impeller, and pulled the seawater strainer. Strainer was not clogged. Good stream from pee hole but … read more
Charles
Charles
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I have twin 2009 150 hp opti's the stbd one acted up shortly
I have twin 2009 150 hp opti's the stbd one acted up shortly after accelerating with a loud horn, check engine light, and rpm reduction of appox. 2250 rpm I have merc monitors on both engines. I repea… read more
Charles
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2007 150 hp Mercury Optimax engine alarm sounds at low rpm
2007 150 hp Mercury Optimax engine alarm sounds at low rpm after engine runs at high rpm for 20 minutes or more. If I do not run engine over 2500 rpm from startup engine will run hour or more with no … read more
Jason
Jason
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98 Yamaha 150 changed complete water pump and housing will
98 Yamaha 150 changed complete water pump and housing will not produce water from pee hole.Checked thermostat and ran water through it and all is clear ran water through pee hole all is clear reinstal… read more
Tan
Tan
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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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I have a 2006 150 Mercury Optimax. A loud constant alarm (
I have a 2006 150 Mercury Optimax. A loud constant alarm ( overheat? ) alarm sounds at idle. If I start it cold, its fine but I can quite make it out from my dock before the alarm goes off. Once I tak… read more
Jason
Jason
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23,069 satisfied customers
Hello I am preparing my boat for the water and have been
Hello I am preparing my boat for the water and have been running the Mercury Optimax 115 in a water basin for cooling and note that the water is coming out of the engine as expected . I am however get… read more
orcamarine
orcamarine
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I have a 2003 90 hp Johnson outboard motor and got stuck in
I have a 2003 90 hp Johnson outboard motor and got stuck in some pluff mud in a lagoon. The overheat alarm did not come on, but I know it got hot, so I removed the Pee valve to make sure there was not… read more
Tan
Tan
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How to replace thermostats. I am not getting much water out
How to replace thermostats. I am not getting much water out of the pee hole indicator of one of my outboards. I am not sure where they are located.… read more
Shane Creekmore
Shane Creekmore
Certified Mercury Marine technician
High School or GED
534 satisfied customers
i have a mercury black max,. 2 stroke, oil injected outboard
i have a mercury black max,. 2 stroke, oil injected outboard 150 - 175 hp. when the boat is under load and travelling at top speed (approx 30 kots) the temerature guageshows engine runing cool then wh… read more
Tan
Tan
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Gentlemen, I have a p60tlht 1996 yahama outboard, the pee
Gentlemen, I have a p60tlht 1996 yahama outboard, the pee hole is not a strong stream - drips - cleaned the tube out - no luck... Water is coming out of the exhaust, I let motor run (docked) for 10min… read more
Noel Schembri
Noel Schembri
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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
Associate Degree
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2004 optimax 250 with 330 hours. Engine cuts out at load when
2004 optimax 250 with 330 hours. Engine cuts out at load when temp suddenly ramps up to 140. Seems to be running 5 deg hotter than normal and will not cut off if kept below 4000 rpm. Water is coming o… read more
Noel Schembri
Noel Schembri
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I have a 2006 sun tracker party barge with a 90 hp optimax.
I have a 2006 sun tracker party barge with a 90 hp optimax. today when I put it in the water and ran it for about 15 minutes or so there was a lound peirceing alarm that came on and off again in the c… read more
Jason
Jason
Associate Degree
210 satisfied customers
My Mercury Optimax 150 slowly heats up and eventually overheats
My Mercury Optimax 150 slowly heats up and eventually overheats even while running at 1000 to 2000 rpm, but only when in gear. When I go back to neutral, the temperature will drop 30 degrees F in less… read more
Mechman45
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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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