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Got a 2007 Mercury 250 EFI idols good but when you tried to
Got a 2007 Mercury 250 EFI idols good but when you tried to get on a plane motor start breaking down won't go… read more
Charles
Charles
Marine Mechanic
5,079 satisfied customers
I have a 115 Mercury outboard 2014 4 stroke. Got it tuned
I have a 115 Mercury outboard 2014 4 stroke. Got it tuned last fall, ran fine until last weekend. Idles fine, but when I provide gas to take off it bogs down, no matter how much gas I give it, it will… read more
Charles
Charles
Marine Mechanic
5,079 satisfied customers
Have 96 Basscat with 200HP Merc EFI 2 Stroke where the oil
Have 96 Basscat with 200HP Merc EFI 2 Stroke where the oil pump was taken out to mix Quicksilver Premium Plus precisely straight into ethanol free gas using 50:1 ratio. Got a rebuild with new Boyesen … read more
Charles
Charles
Marine Mechanic
5,079 satisfied customers
I have a 2008 Mercury 150 EFI on a TR186 Triton. It is usually
I have a 2008 Mercury 150 EFI on a TR186 Triton. It is usually very slow coming out of the hole and top speed is around 48 with little gas, no gear, and 1 person (I have read it should run around 60 w… read more
Tan
Tan
MerCruiser Certified Technician
Certified Marine Technician
11,264 satisfied customers
I have a 40 hp EFI Mercury 4 stroke (2006) Once the boat is
I have a 40 hp EFI Mercury 4 stroke (2006) Once the boat is on a plane it will run for a short period of time then idle back down. I have changed the bulb, fuel filter, and installed a inline filter c… read more
Charles
Charles
Marine Mechanic
5,079 satisfied customers
I have a 1997 Mercury 250 Offshore EFI. It has always run perfectly
I have a 1997 Mercury 250 Offshore EFI. It has always run perfectly and one day It just wouldnt get on plane. RPMs wouldnt go above 200 RPMS while underway. I noticed that in neutral the RPMS would go… read more
orcamarine
orcamarine
Proprietor
Vocational, Technical or Trade Scho
7 satisfied customers
i have a 1996 Mercury 3.0 efi that bogs down when i accellerate.
i have a 1996 Mercury 3.0 efi that bogs down when i accellerate. i have had it a few months and the motor runs fine at idle and once it catches itself and planes the boat out and runs fine it will bog… read more
Malta Tech
Malta Tech
Marine Tech
High School or GED
287 satisfied customers
Have a 2000 200 EFI that has no low speed performance. Take
Have a 2000 200 EFI that has no low speed performance. Take forever to plane , then it will fly. Mash the throttle and wait. I did change fron a 24" to a 25" prop lost 600rpm coincidence????… read more
orcamarine
orcamarine
Proprietor
Vocational, Technical or Trade Scho
7 satisfied customers
Ive got a 1990 mercury blackmax XR4 150 hp. most times i try
I've got a 1990 mercury blackmax XR4 150 hp. most times i try to take off it sputters and bogs down and loses power till the boat planes out then it snaps out of it and runs fine.It idles fine and onc… read more
Charles
Charles
Marine Mechanic
5,079 satisfied customers
i have a 1995 mercury sportjet 120 in a rinker rocket, it ran
i have a 1995 mercury sportjet 120 in a rinker rocket, it ran fine, then i noticed pieces of fly wheel magnets and boat would not go over 3000 rpm, no hole shot or plane. i replaced flywheel, noticed … read more
Jeff G.
Jeff G.
Marine Mechanic
Vocational, Technical or Trade Scho
4,729 satisfied customers
I have a 16 ft. aluminum Legend fishing boat (side console).
I have a 16 ft. aluminum Legend fishing boat (side console). The hull Weight is 640 lbs. Maximum capacity is 1,220 lbs. The outboard engine is 25 HP EFI 4-Stroke. The engine's full throttle RPM range … read more
Jason
Jason
Marine Mechanic
Vocational, Technical or Trade Scho
17,310 satisfied customers
Mercury I have a 2001 Mercury 200 hp EFI. Starts and runs
I have a 2001 Mercury 200 hp EFI. Starts and runs fine, When running above 5300 rpm the motor loses power but does not die. I can tilt back down and plane and run again. i changed the prop to a four b… read more
Jeremy R.
Jeremy R.
5,362 satisfied customers
I have lost 10 mph with my Your search - Mercury Optimax 200
I have lost 10 mph with my Your search - Mercury Optimax 200 HP. I had several operations and the boat set up 4 years. I have very low hours, like a total of 6 trips. The boat is not coming out of the… read more
Jeremy R.
Jeremy R.
5,362 satisfied customers
I have a 225 Mercury EFI, 1998. Coming out of the hole all
I have a 225 Mercury EFI, 1998. Coming out of the hole all is going well until I start to get on plane, the RPMs rev up to over 5k, and I loose poower. Runs on 2k RPMs with no problems.… read more
Tan
Tan
MerCruiser Certified Technician
Certified Marine Technician
11,264 satisfied customers
I have a 2007 15 hp, 4 stroke - cranks first pull, idles great,
I have a 2007 15 hp, 4 stroke - cranks first pull, idles great, runs at top speed great, when i dethrottle off of a plane the engine sputters then cuts off, imediatley after the engine cranks first pu… read more
Whitecap36
Whitecap36
Service Manager/Technician
Vocational, Technical or Trade Scho
1,545 satisfied customers
I have a 1978 Johnson 70hp that has a what seems to be a misfire
I have a 1978 Johnson 70hp that has a what seems to be a misfire under load and will not rev over 2500-2600 rpms. It runs fine on the muffs but not during water test. The carbs were rebuilt, the compr… read more
Dr. Joe
Dr. Joe
Bachelor's Degree
198 satisfied customers
Hi, I have a 2004 Mercury 115hp 4-stroke EFI outboard, when
Hi, I have a 2004 Mercury 115hp 4-stroke EFI outboard, when i rev the engine on neutral sounds fine and will rev up till rev limiter, but in gear or under load, it will start bogging past 3500 rpm and… read more
TOM
TOM
Vocational, Technical or Trade Scho
196 satisfied customers
Hi, I have a 1994 mercury 200 EFI and it wont come out of
Hi, I have a 1994 mercury 200 EFI and it won't come out of the hole. The rpms go to about 1850 and will go no higher until my partner gets on the front deck and once it gets to about 2050 on the rpms … read more
Captain Dave
Captain Dave
Marine Mechanic
Master's Degree
2,672 satisfied customers
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Meet the Experts:

Dominick

Dominick

Marine Mechanic

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25 Years Experience as Mechanic, 20 Yrs Boat Yard Owner/Mechanic, Factory Certified

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Ted G.

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John White

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Jason

Jason

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Tan

Tan

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Jeff G.

Jeff G.

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Captain Dave

Captain Dave

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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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