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Loss of rpm at cruise speed. Twin 4.3lx .Synchronizer
loss of rpm at cruise speed . Twin 4.3lx .Synchronizer fluctuates about 50rpm.noticeable difference in throttle position. seems to run ok. Plugs, wires ,cap and rotor replaced 3 yrs ago … read more
Jason
Jason
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Vocational, Technical or Trade School
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I have a 21 ft sea ray cuddy with a 4.3 V6. Starts right up
I have a 21 ft sea ray cuddy with a 4.3 V6. Starts right up idles good gets up on plane runs great at 3000 to 3500 rpm but as soon as I open it up over 4000 rpm it starts to bog down… read more
Tan
Tan
MerCruiser Certified Technician
Certified Marine Technician
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Buying a 24' maxum bowrider and the 5.7 Mercruiser when we
buying a 24' maxum bowrider and the 5.7 Mercruiser when we took it out ran great for about 45 min then it started to bog down like it was starving for gas.It has a brand new carb on it. when I first w… read more
Noel Schembri
Noel Schembri
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Diploma
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2005 yamaha 225 4 strokes . 290 hrs . launched boat just idling
2005 yamaha 225 4 strokes . 290 hrs . launched boat just idling out of channel starboard motor died . we go anchor starts back up when give it gas then dies again . changed both fuel filter water /fue… read more
Jason
Jason
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Vocational, Technical or Trade School
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I have a 4.3 L Mercruiser engine that runs fine at speeds up
I have a 4.3 L Mercruiser engine that runs fine at speeds up to about 1500 rpm's, but when I get up to cruising speeds of 3000 rpm's and above, the boat will go for a short while then the engine slows… read more
Tan
Tan
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11,406 satisfied customers
Mercury varado 250: i have twin 250 verados. when i am idle
i have twin 250 verado's. when i am idle along for a while and then proceed to take off, the port engine as i slowly accelerate will go to about 3800 rpms and stumble back to around 3200 for a couple … read more
Charles
Charles
Certified Mercury Tech
5,519 satisfied customers
1998 Bayliner Trophy wacc with Mercruiser 4.3. Starts & idles
1998 Bayliner Trophy wacc with Mercruiser 4.3. Starts & idles fine. Last outing after 1 hours running time, lost power down to a max of about 1200 rpm and 3 knots or so. Came in replace distributor ca… read more
Tan
Tan
MerCruiser Certified Technician
Certified Marine Technician
11,406 satisfied customers
I have a 4.3 L Mercruiser and it bogs and wont take fuel.
I have a 4.3 L Mercruiser and it bogs and won't take fuel. I put a bottle of gas dryer in the tank and it ran great for 15 mins and then bogged again. I'm trying to locate the water seperating filter … read more
Tan
Tan
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I have a 5.7 L Mercruiser that has been well maintained. Coming
I have a 5.7 L Mercruiser that has been well maintained. Coming back from a 5 mile trip out in the Gulf the motor started to serge or bog down. It has 1/4 tank of gas and the tank has been cleaned out… read more
James
James
Certified Marine Mechanic
Vocational, Technical or Trade Scho
4,094 satisfied customers
I have a 1998 Mercruiser 7.4L MIE (L29) that loses performance
I have a 1998 Mercruiser 7.4L MIE (L29) that loses performance (runs rough, no power, feels like it's gonna quit) under load starting at around 2800-3000 RPM. Reducing power back to 2000 RPM causes th… read more
Jeremy R.
Jeremy R.
5,362 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
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I have twin Crusader 270s (1989). I am having trouble with
I have twin Crusader 270's (1989). I am having trouble with my port engine. It start up OK and idles fine but when I bring it up to cruising speed (usually 3000 rpm) is starts to hesitate and then sta… read more
Joe
Joe
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Vocational, Technical or Trade Scho
1,392 satisfied customers
engine is running 200 revs down.3800 not 4000 flat out.1.7D mercruiser 2005/2006
Engine revs have dropped by 200 flat out.we cruise at 3000/3200 but when flat out occassionally it always went up to 4000 revs.Does not seem to affect 3000/3200 range.Think it fuel filter.Water separa… read more
Jason Forsberg
Jason Forsberg
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Vocational, Technical or Trade Scho
531 satisfied customers
I have a Mercruiser 4.3, and I took it out this summer for
I have a Mercruiser 4.3, and I took it out this summer for the first time since last year. It cranked right up and will idle perfect but when you increase the throttle to wide open it will only run 10… read more
Captain Dave
Captain Dave
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I have one engine that ran fine 2 days ago. Yesterday the engine
I have one engine that ran fine 2 days ago. Yesterday the engine would only reach 2900 RPM then sputter, knock, and drop off. This got progressively worse as the day went on 2500, 2300, 1800, 1500, an… read more
ROCKET
ROCKET
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Vocational, Technical or Trade Scho
426 satisfied customers
I have a 1999 Sea Ray 210 with a 5.0 Mercruiser I/O. The
"I have a 1999 Sea Ray 210 with a 5.0 Mercruiser I/O. The boat is a cream puff, only 170 hrs on it. Original owner put 150 hours. Over the season it started to run poor, over time, stumble, and lose p… read more
Captain Dave
Captain Dave
Marine Mechanic
Master's Degree
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Just bought a 98 Chaparral with twin Volvo Pentas. When I
Just bought a 98 Chaparral with twin Volvo Pentas. When I fired her up after three weeks in the shipyard I had trouble keeping one of the engines running, but cruised her 4 hours in the ocean at 3200 … read more
Pappy's Sales and Service
Pappy's Sales and Service
Vocational, Technical or Trade Scho
586 satisfied customers
I have a 95 Sylvan with a 4.3 mercruiser engine. The last ...
I have a 95 Sylvan with a 4.3 mercruiser engine. The last three times I took it our it started and ran fine for 20 to 30 minutes. It then begins go bog down and cannot get past 4200 RPM''s. If I drop … read more
Ted G.
Ted G.
Rigger, Diagnostician
Vocational, Technical or Trade Scho
1,074 satisfied customers
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Meet the Experts:

Ted G.

Ted G.

Rigger, Diagnostician

1,074 satisfied customers

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

Dominick

Dominick

Marine Mechanic

1,009 satisfied customers

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

John White

John White

Marine Mechanic

306 satisfied customers

11 years experience working on outboards, inboards, sterndrives & pwcs

Jason

Jason

Marine Mechanic

19,966 satisfied customers

Degree in Marine Technology. Gas and diesel marine mechanic.

Tan

Tan

MerCruiser Certified Technician

11,406 satisfied customers

40 yrs. experience with complete engine repairs both inboard/outboard and MerCruiser Certified Technician.

Jeff G.

Jeff G.

Marine Mechanic

4,730 satisfied customers

42 years experience, Certified Master Technician, All Major Outboards, Sterndrives, Hi-Performance

Captain Dave

Captain Dave

Marine Mechanic

2,672 satisfied customers

USCG Licensed Captain, 20+ Years Boating, Fishing, Maintenance and Repair Experience

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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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