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I sea tested a 2004 Sea Ray 320 today with twin mercruiser
I sea tested a 2004 Sea Ray 320 today with twin mercruiser 3.2's. Boat ran 24mph at 3500 rpm's but at full throttle only went to 28mph and 4000 rpm's. Specs say it should run to 34-34mph at 4500 rpm's… read more
Charles
Charles
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I have a 1995 23' Rinker with a 235 HP MercCruiser Alpha
I have a 1995 23' Rinker with a 235 HP MercCruiser Alpha ONe … read more
Jason
Jason
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Vocational, Technical or Trade Scho
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Hi, I am wondering about what is the optimum operating rpm
Hi, I am wondering about what is the optimum operating rpm for 1994 Mercruiser 7.4l v-8. Any idea… read more
Tan
Tan
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Certified Marine Technician
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I have a 1986 44 Gibson houseboat powered by twin 454 mercruisers
I have a 1986 44' Gibson houseboat powered by twin 454 mercruisers with bravo II drives. I think it weighs around 19000lbs. I am considering doing the Great Loop and am worried about the reliability o… read more
Jason
Jason
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Vocational, Technical or Trade Scho
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I was reading various blogs on "hooks" for the 341 Meridian.
I was reading various blogs on "hooks" for the 341 Meridian. I have a 2006 341 with 6.2's. It was always a bit slow to get on plane but when it was new I could cruise at 20 knots and flat out at 25 kn… read more
Jason
Jason
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Vocational, Technical or Trade Scho
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I have a 2002 310 Sundancer with twin 350 MPI engines with
I have a 2002 310 Sundancer with twin 350 MPI engines with V/drives. My port engine does not accelerate as fast as the stbd. engine when getting on plane and will not put out WOT rpms. I'm only gettin… read more
orcamarine
orcamarine
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Vocational, Technical or Trade Scho
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I have twin mercruiser engines in my 32 boat. At idle and
I have twin mercruiser engines in my 32' boat. At idle and low rpms the engines run smoothly and seem fine. As the rpms increase to 3000 and above the starboard engine lags behind and won't make 4000 … read more
Ted G.
Ted G.
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Vocational, Technical or Trade Scho
704 satisfied customers
I have a 1997 Mercruiser 5.7, throttle body fuel injection. When
I have a 1997 Mercruiser 5.7, throttle body fuel injection. When you accelearte full throttle from a an idle it back fires once at about 3000-3500rpm and then accelerates normally. The tach reads corr… read more
James
James
Certified Marine Mechanic
Vocational, Technical or Trade Scho
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I have a 1988 mainship 36dc with twin 350 crusaders. The
I have a 1988 mainship 36dc with twin 350 crusaders. The port engine is drawing alot more fuel and has no power after 3100 rpm (garmin fuel flow sensors) It will play catch up to the other engine, but… read more
K. Kergan
K. Kergan
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I have a 1990 Rinker 168 with a Mercruiser 4.3 v6 engine in
I have a 1990 Rinker 168 with a Mercruiser 4.3 v6 engine in it. At the end of the 2011 boating season the engine started miss firing at 3500 – 4000 rpm. So last month I had L & R Marine go through and… read more
Noel Schembri
Noel Schembri
Marine mechanic
Diploma
1,740 satisfied customers
I have a 1998 Searay 290DA Sundancer with twin - 5.0 EFI Mercruisers
I have a 1998 Searay 290DA Sundancer with twin - 5.0 EFI Mercruisers and Alpha one drives The boat has 310 hours on it and had been used very little before I purchased it in 2008 For the past several … read more
Ted G.
Ted G.
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after changing out my 350 mercruiser (1989) with a rebuilt
after changing out my 350 mercruiser (1989) with a rebuilt 350 of the same specs ,I am having a hard time to make enough power to bring my 27ft boat up on plane. The prop was changed to a 15x15 from a… read more
shane j forrest
shane j forrest
Vocational, Technical or Trade Scho
270 satisfied customers
i have a 1989 340DA sea ray with twin 7.4 carb. while out
i have a 1989 340DA sea ray with twin 7.4 carb. while out on the boat last night.. about 40 mins into the cruise heard a "bump" behind myself (starboard engine) sounded like someone closing a cabinet.… read more
capt ron 1959
capt ron 1959
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Vocational, Technical or Trade Scho
348 satisfied customers
we have a 2004 bennington pontoon with a mercruiser 115 hp
we have a 2004 bennington pontoon with a mercruiser 115 hp efi outboard. today we notcied the tach was reading 6000 rpm (i really don't think the motor was reving @ 6000) and it ran more like a speed … read more
Jeremy R.
Jeremy R.
5,362 satisfied customers
I have installed a 350 5.7L with a 4 barrel carb in my Stamas
I have installed a 350 5.7L with a 4 barrel carb in my Stamas 25 IO . Max RPM 3700 speed 24 Kts. I have points in the distrib. The engine bogs down at 3000 RPM and recovers up to 3700. It has while WO… read more
Master Tech
Master Tech
Service Manager/Technician
Vocational, Technical or Trade Scho
1,167 satisfied customers
1991 Mariah open bow, 4.3L Mercruiser Alpha One 1. At higher
1991 Mariah open bow, 4.3L Mercruiser Alpha One 1. At higher RPMs (above 3500 or so, typical holeshot), the engine smoothly revs up, brings the boat up on plane, then dies. RPM gauge drops almost inst… read more
Scott
Scott
Marine technician
Vocational, Technical or Trade Scho
543 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
Vocational, Technical or Trade Scho
586 satisfied customers
I have a 2006 Malibu inboard with a 5.7 fuel injected ...
I have a 2006 Malibu inboard with a 5.7 fuel injected engine.The engine idles great but spits sputters and hesitates when given throttle and will only turn about 3500 rpms. It acts like it bumps again… read more
Pappy's Sales and Service
Pappy's Sales and Service
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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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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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