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My 200 hp was running find but when I slowed down the engine
my 200 hp Johnson was running find but when I slowed down the engine bogged down and had not much pick up. Now it starts easily, idles a little high rpm and then shuts down after two minutes. I change… read more
Boat Doc
Boat Doc
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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
Certified Mercury Tech
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I have a 1985 60hp Mercury, 3 cyl, 2 carbs, low RMP runs
I have a 1985 60hp Mercury, 3 cyl , 2 carbs, low RMP runs great, poor the gas to it and it runs great, then about 5 min later, stalls out. Starts right back up, but at 1/2 to 2/3 throttle bogs out aga… read more
Jeff G.
Jeff G.
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Vocational, Technical or Trade Scho
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1999 Volvo Pentax 5.0gi owner years, boat has been
1999 Volvo Pentax 5.0gi owner for 3 years, boat has been flawless,took it out 1 st time this season,2 days ago ran great, took it out yesterday ran great for 2-3 hrs, storm was approaching shut down i… read more
Tan
Tan
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I recently purchased a 2010 Sea Ray with a 2010 Sear Ray
Hello, I recently purchased a 2010 Sea Ray with a 2010 Sear Ray Mercruiser 4.3 TKS (with 12.5 hours) which I was told had 1-2 year old gas, probably ethanol gas. I changed the water separator and drai… read more
Tan
Tan
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11,264 satisfied customers
Last summer my son ran out of fuel and the boat has never run
Last summer my son ran out of fuel and the boat has never run right since. It will start and run fine till you get up to 4000 rpms. Then it bogs down and will not plane off. We have replaced the fuel … read more
Jason
Jason
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Vocational, Technical or Trade Scho
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Have 300 x outboard with low hours, have new fuel, new filters,,new
Have 300 x outboard with low hours, have new fuel, new filters,,new high end fuel pimp and relays, starts at first turn, idles perfect , runs great low speed, hit the throttle and full power for 10 se… read more
Jason
Jason
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Vocational, Technical or Trade Scho
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My shamrock with Chevy 350 alway runs like a top, recently
My shamrock with Chevy 350 alway runs like a top, recently it has had trouble starting, now I must say I idle or run under 1000 too often as I live and transit in a marina. It would start cold and whe… read more
orcamarine
orcamarine
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Vocational, Technical or Trade Scho
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5.7 merc runs perfect in neutral but WOT boggs down and wont
5.7 merc runs perfect in neutral but WOT boggs down and wont go over 3k gets there very slow, everything in fuel system is new or overhauled, got new ignition module and timing is correct 10 BTC, it r… read more
Whitecap36
Whitecap36
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Vocational, Technical or Trade Scho
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HAVE A 1979 MERC 700 PROBLEM IS THE BOAT RUNS AT FULL THROTTLE
HAVE A 1979 MERC 700 PROBLEM IS THE BOAT RUNS AT FULL THROTTLE AND WHEN YOU SLOW DOWN AND THE GO FULL IT SOUNDS LIKE ITS STARVING FOR FUEL AND WILL NOT RUN WIDE OPEN ,I PULLED THE CARBS CLEANEN ALL JE… read more
Jeff G.
Jeff G.
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Vocational, Technical or Trade Scho
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I have a 96 mercury 2 stroke 65 hp jet, and it boggs down at
I have a 96 mercury 2 stroke 65 hp jet, and it boggs down at full throttle. idles fine but when i try to plane the boat out the rpms come up and then it boggs down. carb problems?… read more
Jason
Jason
Associate Degree
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4.3 MERCRUISER, RUNS GREAT COLD, WHEN IT WARMS UP AND YOU IDLE
4.3 MERCRUISER, RUNS GREAT COLD, WHEN IT WARMS UP AND YOU IDLE IT STALLS AND WONT RESTART. NEED TO WAIT 20 TO 30 MIN, THEN IT STARTS IF I WERE OUT ON THE WATER AND GOING 20 MPH OR MORE IT DOES NOT STA… read more
shane j forrest
shane j forrest
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270 satisfied customers
The motor revs up fine out of the water even in gear with water
The motor revs up fine out of the water even in gear with water running in it, but won't rev over 2000 rpm in the water. Anything over 1/2 throttle just boggs down and goes slower… read more
Steve Sr.
Steve Sr.
No Title
High School or GED
79 satisfied customers
I have a 95 Maxum with a Mercruiser 4.3 v6 engine. Lately,
I have a '95 Maxum with a Mercruiser 4.3 v6 engine. Lately, when I take the boat out, it will run great for 30 min to about an hour and then bog down/stall out. After a couple of minutes, I can crank … read more
Mechman45
Mechman45
Vocational, Technical or Trade School
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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
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.
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Vocational, Technical or Trade Scho
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I have a 1977 Johnson 140hp.It starts and idles around ...
I have a 1977 Johnson 140hp.It starts and idles around fine.When I give it more throttle it speeds up a little but won''t get up on plane.I''ve checked the spark and compression and both are fine.Coul… read more
Captain Dave
Captain Dave
Marine Mechanic
Master's Degree
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I have a 83 Larson with a 470 merc cruiser and the ...
I have a 83 Larson with a 470 merc cruiser and the motor run fine but when the outdrive is ingaged then the boat will not run at full speed What could be the problem… read more
BC Boat Guy
BC Boat Guy
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Meet the Experts:

Dominick

Dominick

Marine Mechanic

1,009 satisfied customers

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

Ted G.

Ted G.

Rigger, Diagnostician

704 satisfied customers

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

John White

John White

Marine Mechanic

306 satisfied customers

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

Jason

Jason

Marine Mechanic

18,802 satisfied customers

Degree in Marine Technology. Gas and diesel marine mechanic.

Tan

Tan

MerCruiser Certified Technician

11,264 satisfied customers

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

Jeff G.

Jeff G.

Marine Mechanic

4,729 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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