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We were out on the water with 9.9 mercury engine at full
we were out on the water with 9.9 mercury engine at full throttle, and all of a sudden it cut back to half throttle. It did not stall and we were able to get it to the dock. No problems slowing or rev… read more
Jason
Jason
Marine Mechanic
Vocational, Technical or Trade School
22,804 satisfied customers
87 yamaha 40hp. motor only runs about 1/3 power even with
87 yamaha 40hp. motor only runs about 1/3 power even with throttle all the way forward. several times after running a while it will suddenly "kick in" and go to full power. … read more
Noel Schembri
Noel Schembri
Marine Mechanic
Diploma
2,759 satisfied customers
9.9 maybe 2007-2010 acting up this summer. It started and
Johnson 9.9 maybe 2007-2010 acting up this summer. It started and run well initially but a few moments later started acting up. It won't go full speed. The gas tank used was from last year, it was sto… read more
Jason
Jason
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Vocational, Technical or Trade School
22,804 satisfied customers
Honda 9.9 i have two wires going to the cdi from the pulser
honda 9.9 i have two wires going to the cdi from the pulser positive and negative getting a reading from them ,,,getting a reading going … read more
Charles
Charles
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I have an 86 evinrude 175 V6, bottom 2 cylinders on left
Hi, I have an 86 evinrude 175 V6, bottom 2 cylinders on left bank are not firing, I have a spark tester and a stevens CD77, tested the stator and timer base,they read good, battery is fully charged. I… read more
Jason
Jason
Marine Mechanic
Vocational, Technical or Trade School
22,804 satisfied customers
I have a 1988 Crusader twin screws 350\270 port side wont
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Tan
Tan
MerCruiser Certified Technician
Certified Marine Technician
11,409 satisfied customers
I have purchased a 1998 evinrude 150 carbureted for a good
I have purchased a 1998 evinrude 150 carbureted for a good price. I started it about 4 months ago and was running a bit erratic since then I rebuilt all 6 carburetors changed power pack, all 3 coils, … read more
Jason
Jason
Marine Mechanic
Vocational, Technical or Trade School
22,804 satisfied customers
Hello, I have a 1988 Pursuit 2550 with twin Yamaha 150s
Hello, I have a 1988 Pursuit 2550 with twin Yamaha 150's of the same year. These are two stroke. Run them with pre mixed regular gas at 50:1. They where sitting about a month. While flushing the starb… read more
Tan
Tan
MerCruiser Certified Technician
Certified Marine Technician
11,409 satisfied customers
Hello out there, I have a 1990 J200 that is coughing. I have
Hello out there, I have a 1990 J200 that is coughing. I have good compression and have completed a spark test and have good spark. I also took the motor down to the Reed boxes today, they are in perfe… read more
Jason
Jason
Marine Mechanic
Vocational, Technical or Trade School
22,804 satisfied customers
have a 9.9 sailmaster outboard. Has not been run in several
have a 9.9 sailmaster outboard. Has not been run in several years. Today i went to run the engine. will start and stay on for at least 20 minutes tested with the throttle almost closed. When i start t… read more
Tan
Tan
MerCruiser Certified Technician
Certified Marine Technician
11,409 satisfied customers
hi i have a mariner 25hp electric start ive just put in fresh
hi i have a mariner 25hp electric start ive just put in fresh petrol 2 new plugs and a fully charged battery i tried to start it and it wont start i checked for spark ive got spark i am fairly practic… read more
Noel Schembri
Noel Schembri
Marine Mechanic
Diploma
2,759 satisfied customers
2005 Yamaha 70 hp 2 cycle outboard was running fine. Had just
2005 Yamaha 70 hp 2 cycle outboard was running fine. Had just completed two five mile runs, motor was running perfect. We stopped to fish for a few minutes. I went to crank engine and it would not fir… read more
Noel Schembri
Noel Schembri
Marine Mechanic
Diploma
2,759 satisfied customers
I have a new (approx 12 hours) Suzuki 4 cycle 9.9 HP on my
I have a new (approx 12 hours) Suzuki 4 cycle 9.9 HP on my sailboat. It is an electric start model. I can't get it to start. I know its getting gasoline. I checked both spark plugs and they look clean… read more
Captain Dave
Captain Dave
Charter Captain & I.S. Director
Master's Degree
2,808 satisfied customers
Having problems with my 1986 Johnson 8hp Sailmaster. It will
Having problems with my 1986 Johnson 8hp Sailmaster. It will usually start on a couple pulls but wont stay runnin for more than 15 seconds at idle. when i try to throttle up, it bogs down and surges, … read more
Tan
Tan
MerCruiser Certified Technician
Certified Marine Technician
11,409 satisfied customers
I have a Johnson 9.9 4 stroke that will not start. It stopped
I have a Johnson 9.9 4 stroke that will not start. It stopped working and can not get it started. My boat mechanics replaced a power pack, checked ignition relay, copper magnet coil under the fly whee… read more
Dominick
Dominick
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Vocational, Technical or Trade Scho
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no spark black & yellow hot but coils cold it an older 1976
no spark black & yellow hot but coils cold it an older 1976 85 hp with the single power pack… read more
John White
John White
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Vocational, Technical or Trade Scho
306 satisfied customers
have a 50 hp mercury 4cylinder engine it runs fine in the water
have a 50 hp mercury 4cylinder engine it runs fine in the water but wont accelarate past half throttle . have cleaned both carbs. and checked fuel pickup and lines . replaced all plugs and checked tha… read more
ROCKET
ROCKET
MASTER CERTIFIED TECH
Vocational, Technical or Trade Scho
426 satisfied customers
79 merc 90hp thunderbolt3 inline6- after sitting for ...
79 merc 90hp thunderbolt3 inline6- after sitting for long periods, will not start, have to pull plugs and put fuel in cylinders to start- after warm will start normally- rebuilt carbs, fuel pump,has n… read more
Captain Dave
Captain Dave
Charter Captain & I.S. Director
Master's Degree
2,808 satisfied customers
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Meet the Experts:

Ted G.

Ted G.

Rigger, Diagnostician

9,168 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

22,804 satisfied customers

Degree in Marine Technology. Gas and diesel marine mechanic.

Tan

Tan

MerCruiser Certified Technician

11,409 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

Noel Schembri

Noel Schembri

Marine Mechanic

2,759 satisfied customers

Advanced technical diploma

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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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