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I have a 1990 evinrude xp 150hp that isn't running right. It
I have a 1990 evinrude xp 150hp that isn't running right. It idles fine and starts easy. Nothing sounds unusual on startup and idle. Once I begin to accelerate to bring the boat up on plane, the engin… read more
Jason
Jason
Marine Mechanic
18,473 satisfied customers
1993 Mercruiser 5.0(alpha) Thunderbolt 4 if ignition Idles
1993 Mercruiser 5.0(alpha) Thunderbolt 4 if ignition Idles and runs fine up to around 2500 Rpms. Then the carb backfires and the engine begins to stall. Have replaced: Fuel pump Carb rebuild Alternato… read more
Jason
Jason
Marine Mechanic
18,473 satisfied customers
My 2007 optimax 115hp stroke goes from WOT to mid RPM and
My 2007 optimax 115hp stroke goes from WOT to mid RPM and back again in 15-20 seconds … read more
Jason
Jason
Marine Mechanic
18,473 satisfied customers
Started my boat up for the first time this year after
started my boat up for the first time this year after professional winterization. Started fine, took it for a spin and about 1/3 of a mile or so the boat began to chug a bit and then died. Started it … read more
Jason
Jason
Marine Mechanic
18,473 satisfied customers
Have a 1979 searay, 27ft. up to about 2000rpm runs good.
have a 1979 searay, 27ft. up to about 2000rpm runs good. first time it happened thought we heard a backfire. last four times out, once was able to get full throttle. just starts to shutter and shake a… read more
Jason
Jason
Marine Mechanic
18,473 satisfied customers
Engine # ***** 654200 Type; Mercruiser 454 MAG mpi Horizon Build
Engine # ***** 654200 Type; Mercruiser 454 MAG mpi Horizon Build date; 2000 or 2001 Problem details; 2010: First failed to start at fuel dock 3 years ago about the second day the NEW engine was restar… read more
capt ron 1959
capt ron 1959
Owner/Marine Mechanic
Vocational, Technical or Trade Scho
348 satisfied customers
I have a 1994 bayliner trophy with a 115 mercury will idle
I have a 1994 bayliner trophy with a 115 mercury will idle fine gets on plane for a few minutes then bogs down ball doesnt stay hard have replaced fuel pump,entire ball and line assembly and filter ha… read more
Tan
Tan
MerCruiser Certified Technician
Certified Marine Technician
11,264 satisfied customers
I have a 1996 sport nautique. On hot days after a hour or two
I have a 1996 sport nautique. On hot days after a hour or two of use the boat just quits. If we let the boat sit for a few hours it will start back up and run like nothing happened. Yesterday we pulle… read more
K. Kergan
K. Kergan
Inboard/Outboard Mechanic
Vocational, Technical or Trade Scho
1,031 satisfied customers
when i gave the boat some throttle and just after plaining
when i gave the boat some throttle and just after plaining the engine would go back to idle but not die then it would start out again fine and do the same thing acting like i pulled the throttle back … read more
Abiorca
Abiorca
Proprietor
Vocational, Technical or Trade Scho
1,768 satisfied customers
I have a Mercruiser GM 5.0 (305), that is having stalling issues
I have a Mercruiser GM 5.0 (305), that is having stalling issues at high rpms. Ran it yesterday on a long trip (30 miles) and it ran fine for 35 minutes and then began to stall slightly. Slowed down, … read more
Jason
Jason
Marine Mechanic
18,473 satisfied customers
i have problems my boat will only do upto 2200 rpms itll get
i have problems my boat will only do upto 2200 rpms itll get upto 2700 to 2800 then jump down real hard to 2200rpms and stay there wont gain any at all and idles rough and starts little funny too… read more
Jeff G.
Jeff G.
Marine Mechanic
Vocational, Technical or Trade Scho
4,729 satisfied customers
I have a 2008 350 300hp mercruiser pontoon boat. This yr
I have a 2008 350 300hp mercruiser pontoon boat. This yr I had problems with the engine. While traveling about 50 mph the engine suddenly shut down and would not start. Backfired when I tried to crank… read more
Whitecap36
Whitecap36
Service Manager/Technician
Vocational, Technical or Trade Scho
1,476 satisfied customers
Dear Yanmar I have a Yanmar YSM-12 engine in my yacht. The
Dear Yanmar I have a Yanmar YSM-12 engine in my yacht. The exhaust valve keeps corroding and it looks as though cooling water is getting into it. However, I am careful to keep the suction valve on the… read more
Yachtwork
Yachtwork
Owner Team Yachtwork
Technical or Trade School
1,042 satisfied customers
hey guys i am pulling my hair out.key largo boat. johnson 90
hey guys i am pulling my hair out.key largo boat. johnson 90 hp 99 year. bubbel pumps up.runs 5min. bubbel calaps. motor shuts down. Richard Billings st. [email protected]… read more
Master Tech
Master Tech
Service Manager/Technician
Vocational, Technical or Trade Scho
1,167 satisfied customers
I have a Merc Cruiser inboard/outboard 5.0L circa 1995. Problem
I have a Merc Cruiser inboard/outboard 5.0L circa 1995. Problem is the engine seems to stall out when it is put under load...miss fires, some popping out of the carb, just sounds like crap....I found … read more
capt ron 1959
capt ron 1959
Owner/Marine Mechanic
Vocational, Technical or Trade Scho
348 satisfied customers
to whom it may concern i have 19 ft boat with 20 gallon built
to whom it may concern i have 19 ft boat with 20 gallon built in tank and 1987 140 hp johnson.when i give throttle it does not go past 10 knots,if i back off to idle and give gas again i may be able t… read more
Master Tech
Master Tech
Service Manager/Technician
Vocational, Technical or Trade Scho
1,167 satisfied customers
I HAVE A 1976 140 HORSE JOHNSON OUT BOARD MOTOR. THE MOTOR
I HAVE A 1976 140 HORSE JOHNSON OUT BOARD MOTOR. THE MOTOR WILL START AND IDLE FINE . WHEN YOU GIVE IT THE GAS IT WILL BOG DOWN AND DIE.IF YOU KEEP CHOKEING IT OFF AND ON THE SAME TIME YOUR SLOWLEY GI… read more
Jason Forsberg
Jason Forsberg
Outboard Marine Mechanic
Vocational, Technical or Trade Scho
531 satisfied customers
I have a 1994 Starcraft with a 4.3LX V6 Alpha one. My problem
I have a 1994 Starcraft with a 4.3LX V6 Alpha one. My problem is fuel related. The problem started on a fishing trip. The boat had started fine for 8 years. In the middle of the trip it I replaced the… read more
ROCKET
ROCKET
MASTER CERTIFIED TECH
Vocational, Technical or Trade Scho
426 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

Ted G.

Ted G.

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40 years boating, Safe boating instruct., Offshore Race promoter, Failure Analysis, Expert Witness

John White

John White

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Jason

Jason

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Degree in Marine Technology. Gas and diesel marine mechanic.

Tan

Tan

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Jeff G.

Jeff G.

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4,729 satisfied customers

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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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