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Have a 1988 200 hp Mercury ob motor that won't pull over
Have a 1988 200 hp Mercury ob motor that won't pull over 2500 rpms under load. compression 118 to 122. overhauled carbs. ran rough and wont get on plain. checked spark. # 1 coil no fire. replaced both… read more
Charles
Charles
Marine Mechanic
Certified Mercury Tech
5,078 satisfied customers
I have a 1975 7.5 Mercury OB 2 stroke. it will start, and
Hello, I have a 1975 7.5 Mercury OB 2 stroke. it will start, and run but it doesn't get up to full power. I had to replace the switch box due to the insulation on the wires falling off. The kill switc… read more
Tan
Tan
MerCruiser Certified Technician
Certified Marine Technician
11,264 satisfied customers
I recently purchased a 1987 Mercury 115 tower of power
I recently purchased a 1987 Mercury 115 tower of power outboard - inline 6. It has Rough starting and idling and BOG issue. It will "only" start/ idle when we give it throttle in neutral (advance the … read more
Michael
Michael
master marine technician/charter captain
Vocational, Technical or Trade Scho
256 satisfied customers
1983 Mercury 115 HP outboard stalls/dies after revving up to
1983 Mercury 115 HP outboard stalls/dies after revving up to about 1200 RPM - but only when trying to accelerate in forward or reverse gear. Motor usually starts OK and idles fine and will rev up to h… read more
Jeff G.
Jeff G.
Marine Mechanic
Vocational, Technical or Trade Scho
4,729 satisfied customers
I have a 1996, 90 hp outboard mercury. I had problems with
I have a 1996, 90 hp outboard mercury. I had problems with the idle - got it fixed, now the motor won't get up to high speed. should do 35mph, only will do 8mph. any thoughts as to how to fix that. It… read more
Charles
Charles
Marine Mechanic
Certified Mercury Tech
5,078 satisfied customers
I have a 96 johnson 40hp recently ive had intermittent starting
I have a 96 johnson 40hp recently ive had intermittent starting issues no spark on both cyls. I replaced the ignition key safety switch assembly and installed new plugs. Fired right upran all day long… read more
Jeff G.
Jeff G.
Marine Mechanic
Vocational, Technical or Trade Scho
4,729 satisfied customers
I have a 1975 Evinrude 115 Hp with stator or charging problems.
I have a 1975 Evinrude 115 Hp with stator or charging problems. The direct current values taken from the rectifier terminal has negative values. (-50, -856, -436 and so on) I bought this motor used an… read more
Jeff G.
Jeff G.
Marine Mechanic
Vocational, Technical or Trade Scho
4,729 satisfied customers
Good Day, I have a 125 HP Mercury, 4 cylinders. I purchased
Good Day, I have a 125 HP Mercury, 4 cylinders. I purchased the unit/boat 2 years ago with the motor only having run 6 hours. I however have a serious "dead spot" on opening the throttle, this is very… read more
Tan
Tan
MerCruiser Certified Technician
Certified Marine Technician
11,264 satisfied customers
I have a 25 hp mercury outboard that i purchased used. When
I have a 25 hp mercury outboard that i purchased used. When trying to start the engine, the sparkplug only recive fire once from the power pack. What are the test procedures to check the power pack.… read more
Jason
Jason
Marine Mechanic
Vocational, Technical or Trade Scho
17,310 satisfied customers
hi, i have a 1998 200 hp evinrude outboard. Model # XXXXX
hi, i have a 1998 200 hp evinrude outboard. Model # XXXXX its a couter rotating engine. I have no spark on 2 cylinders, same side. I swapped coils with good ones and I still have no spark on the same … read more
Jeff G.
Jeff G.
Marine Mechanic
Vocational, Technical or Trade Scho
4,729 satisfied customers
I have a 1989 50 Hp evinrude. The oil injection went bad so
I have a 1989 50 Hp evinrude. The oil injection went bad so I replaced it with a fuel pump and mix my gas. I just unpluged the electrical and it has run fine, excellent at high rpms. It didn't idle pr… read more
Jeff G.
Jeff G.
Marine Mechanic
Vocational, Technical or Trade Scho
4,729 satisfied customers
johnson 1988 225 vro just replaced stator due to no spark
johnson 1988 225 vro: just replaced stator due to no spark in cylinders 2-4-6 now runs smooth to 2000 rpm and then is starts to sputter like a rev limiter.. in neutral or in drive.. sputter is consist… read more
Jeff G.
Jeff G.
Marine Mechanic
Vocational, Technical or Trade Scho
4,729 satisfied customers
the top cylinder has good compression but the sparkplug is
the top cylinder has good compression but the sparkplug is not firing. Sometimes it runs on all cylinders and others it doesn't… read more
Jeff G.
Jeff G.
Marine Mechanic
Vocational, Technical or Trade Scho
4,729 satisfied customers
I have a 1988 mariner 100 hp. The motor runs fine at times
I have a 1988 mariner 100 hp. The motor runs fine at times but at times it just wount start. It has gas but no spark. I thought it might be a shot in the kill switch but its fine. The mercury swith al… read more
Jeremy R.
Jeremy R.
5,362 satisfied customers
2000 Mercury 25 HP intermitantly loses power at high throttle
2000 Mercury 25 HP intermitantly loses power at high throttle range,fuel system okay water discharge okay one coil replaced still occassionally happens.Does this engine have over rev and over temp sen… read more
Dominick
Dominick
Marine Mechanic
Vocational, Technical or Trade Scho
1,009 satisfied customers
HAVE 1988 70HP MERCURY OUTBOARD,NO SPARK,CHECKED FOR POWER
HAVE 1988 70HP MERCURY OUTBOARD,NO SPARK,CHECKED FOR POWER ,SWITCHS,DEADMAN SWITCH,CRANK ENGINE AND HAVE POWER GOING TO BOX BEING FED FROM UNDER FLYWHEEL,VOLTAGE GOING INTO BOX AND WIRING COMING OUT G… read more
Master Tech
Master Tech
Service Manager/Technician
Vocational, Technical or Trade Scho
1,167 satisfied customers
my 90 hp yamaha ob will not power up above 3000 rpm in gear.
my 90 hp yamaha ob will not power up above 3000 rpm in gear. revs up perfectly in neutral? whats up?… read more
ROCKET
ROCKET
MASTER CERTIFIED TECH
Vocational, Technical or Trade Scho
426 satisfied customers
I have a 2004 25 hp mercury. The engine sank in salt water.
I have a 2004 25 hp mercury. The engine sank in salt water. Everything was flushed out with fresh water, carbs cleaned, etc.. Now... when starting the engine and in neutral it sounds like its getting … read more
davesoutboard
davesoutboard
owner
Associate Degree
1,570 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

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Tan

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Jeff G.

Jeff G.

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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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