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I have 2003 115 HP Mercury outboard that runs fine however
I have 2003 115 HP Mercury outboard that runs fine however the tachometer has been replaced with a new one . I installed the tach and the RPM would only go to 4000 and drop off . I believed the Tach w… read more
Noel Schembri
Noel Schembri
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WHAT IS THE PROP SIZE 120 HP ELPT MERCURY FORCE ENGINE. I
WHAT IS THE PROP SIZE FOR A 120 HP ELPT MERCURY FORCE ENGINE. I PURCHASED THIS ENGINE USED AND FEEL THE PROP IS NOT THE PROPER SIZE. CURRENTLY THE ONE I'M RUNNING IS 13 1/4 X 17 PITCH… read more
Tan
Tan
MerCruiser Certified Technician
Certified Marine Technician
11,406 satisfied customers
My new Merc 90hp EFI 4-stroke is getting awful gas mileage.
My new Merc 90hp EFI 4-stroke is getting awful gas mileage. I bought a Tracker Grizzly 2072. The package came to me directly from the dealer. Any adjustments that should be made, or maybe I forgot to … read more
Jason
Jason
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Vocational, Technical or Trade School
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I have a brand new Mercury 115hp outboard motor. On my first
I have a brand new Mercury 115hp outboard motor. On my first voyage everything worked well for a short while. We then noticed performance issues as to when it got between 4000 and 5000rpm it ran rough… read more
Charles
Charles
Certified Mercury Tech
5,628 satisfied customers
Good Morning Larry, I have a quick question. I'm running
Good Morning Larry, I have a quick question. I'm running twin 250 optimax, which are practically brand new. Boat has been taking less ten times with about a 3 to 4 fuel tank refills. Yesterday it slow… read more
Charles
Charles
Certified Mercury Tech
5,628 satisfied customers
Hi Tan Dwight Nicholas here. First of all I want to thank
Hi Tan Dwight Nicholas here. First of all I want to thank you for the great advice on my 1995 Mercury XR6. I replaced the coil and found a broken wire from the switchers to the coil on the other cylin… read more
Tan
Tan
MerCruiser Certified Technician
Certified Marine Technician
11,406 satisfied customers
2004 50 hp johnson. engine ran fine most of the day. when returning
2004 50 hp johnson. engine ran fine most of the day. when returning to the dock i tried to get boat on plane. It wouldnt give me the throttle power or rpms to do it. wondering what i should check.… read more
Jason
Jason
Marine Mechanic
Vocational, Technical or Trade School
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I have a 1982 Mercury 115hp Tower of Power 2 stroke/6 cylinder.
I have a 1982 Mercury 115hp Tower of Power 2 stroke/6 cylinder. It starts fine. It idles fine. It goes in and out of gear fine. On throttle, it revs to 5500 RPM. In reverse, it runs up to 4500 RPM. Bu… read more
Jeff G.
Jeff G.
Marine Mechanic
Vocational, Technical or Trade Scho
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i have a 07 Searay 195S with a Merc 4.3MPI (220hp). first
i have a 07 Searay 195S with a Merc 4.3MPI (220hp). first time out this season, I am having issues with power above 5000RPM. At first I thought the issue was with the RPM gauge...it held an idle readi… read more
Tan
Tan
MerCruiser Certified Technician
Certified Marine Technician
11,406 satisfied customers
I have a 2002 Glastron 205GX boat. My problem is at 40 mph
I have a 2002 Glastron 205GX boat. My problem is at 40 mph and 4000 rpm I can only trim it up 1/4 before it begins to cavitate. Have tried a 14.5 x19 and a 14.3x21 prop.… read more
Tech Tom
Tech Tom
Owner/Tech Custom Yacht Service
Associate Degree
17 satisfied customers
hello I HAVE A SUZUKI DF(NNN) NNN-NNNNLAST WEEK I HAD TO REPLACE
hello I HAVE A SUZUKI DF(NNN) NNN-NNNNLAST WEEK I HAD TO REPLACE A SPARK PLUG, NOW WHEN ENGINE IS RUNNING IT IS FINE UP TO 4000 rpm, BUT WILL NOT GO OVER 4000rpm THERE ARE NO LIGHTS ON NOW BUT THERE W… read more
Jeremy R.
Jeremy R.
5,362 satisfied customers
I have a Mercury 115hp 2005 4 stroke and it was running at
I have a Mercury 115hp 2005 4 stroke and it was running at 5000rpm and then loses and goes to 4000 rpm. It also seems to have a vibration at the back of the boat. The motor has only 20-30 hours but ha… read more
Jason
Jason
Marine Mechanic
Vocational, Technical or Trade School
20,531 satisfied customers
I have a 2003 150hp Optimax saltwater and today I took it out
I have a 2003 150hp Optimax saltwater and today I took it out after running at home for at least 20 minutes and it seems to run fine at low Rpm and when the button is pushed in and when under load it'… read more
Jeff G.
Jeff G.
Marine Mechanic
Vocational, Technical or Trade Scho
4,730 satisfied customers
HI, have a 1999 johnson 60hp motor. starts fine, runs fine
HI, have a 1999 johnson 60hp motor. starts fine, runs fine full throttle until i slow down, then it won't go above 2400 rpms, tilt motor up out of water, rpms jump to 4800, tilt back down into water, … read more
Jeff G.
Jeff G.
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Vocational, Technical or Trade Scho
4,730 satisfied customers
Have a 1991 200BR SeaRay with 4.3LX V6 Mercuiser inboard/outboard.
Have a 1991 200BR SeaRay with 4.3LX V6 Mercuiser inboard/outboard. Ran great till yesterday, running at 4000rpm, throttled down to 1500rpm, after a minute, motor stuttered and stalled, won't restart a… read more
Jeremy R.
Jeremy R.
5,362 satisfied customers
Hi folks, I have a 60 HP Mariner 1988(I think) It starts and
Hi folks, I have a 60 HP Mariner 1988(I think) It starts and runs fine, I put it into the water on a trailer and can run it up to 5000RPM with no problem. It drives he trailer up the beach. Take it of… read more
Captain Dave
Captain Dave
Marine Mechanic
Master's Degree
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My 2006 merc 115 optimax has a hard time getting past 4000
My 2006 merc 115 optimax has a hard time getting past 4000 rpm. if i put in a fresh set of ngk plugs it helps for a while. The motor has about 55 hours on it. i just put the third set of plugs in it. … read more
TOM
TOM
Vocational, Technical or Trade Scho
196 satisfied customers
Hi, I have a 1995 Mercruiser 4.3L lx IV thunderbolt ignition.
Hi, I have a 1995 Mercruiser 4.3L lx IV thunderbolt ignition. Motor operates great cold at full throttle, 20 mins later the rpms bounce all over the place over 4000 rpms. I have replace carb, had a sp… read more
Pappy's Sales and Service
Pappy's Sales and Service
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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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