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I have a 2009 Mercury 4 stroke 40hp EFI. The engine seems to
Hello, I have a 2009 Mercury 4 stroke 40hp EFI. The engine seems to run perfectly but wont rev over 5300 rpm. The boat came from Boston Whaler with a 14 inch prop. There test data shows the rpm to be … read more
Noel Schembri
Noel Schembri
Marine Mechanic
Diploma
2,759 satisfied customers
1999 mercury outboard, 40hp, running rough at low speed,
1999 mercury outboard, 40hp, running rough at low speed, already cleaned all 3 carburators, replace plugs and gas filter. Coil 1 resistance 8.8ohm Coil 2 resistance 7.9ohm Coil 3 resistance 8.4ohm...… read more
Charles
Charles
Marine Mechanic
Certified Mercury Tech
5,754 satisfied customers
Have 3yr old 40hp,efi 3cyl mercury outboard. Starts and runs
Have 3yr old 40hp,efi 3cyl mercury outboard. Starts and runs at idle when put in gear. Will not take gas when trying to accelerate, just falls on its face. Changed high speed fuel pump, cleaned needle… read more
Charles
Charles
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Motor will run fine, I'll stop and restart and all is good.
Motor will run fine, I'll stop and restart and all is good. After about 3 start attempts, motor will stall and cannot restart. After a few hours motor will restart with same same problem stated above.… read more
Charles
Charles
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5,754 satisfied customers
I have a 2004 mercury 40hp with an intermittent problem it
I have a 2004 mercury 40hp with an intermittent problem it will run normal at 5,000 rpms then drop off to 3,000 rpms and have changed fuel filter , replaced fuel pump and fuel hoses , cleaned fuel tan… read more
Jason
Jason
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Vocational, Technical or Trade School
22,804 satisfied customers
I have a Starcraft Pontoon, I have 2006 Starcraft Pontoon
I have 2006 Starcraft Pontoon that is a 226. It has 2006 Mercury 115 EFI 4 Stroke on it. I'm topping out a 5000 rpm's and maxing out at 15mph per GPS. This is with the boat unloaded. Max RPM range is 5000-6000. … read more
Jason
Jason
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Vocational, Technical or Trade School
22,804 satisfied customers
My 2006 90hp Honda outboard runs great at idle and great
My 2006 90hp Honda outboard runs great at idle and great throttle response up to 6000 rpm at 75% throttle. However, once in gear, the throttle only atains(###) ###-####rpm at 75-100% throttle and no m… read more
Jason
Jason
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Vocational, Technical or Trade School
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I have a 24' pontoon 2011 with Honda 50 outboard. Rpm's
I have a 24' pontoon 2011 with Honda 50 outboard. Rpm's reach 6300-6400 and will maintain it for 2-3 minutes then gradually slows to 3500-3600 rpm.... I get out of the throttle and put into neutral an… read more
Jeff G.
Jeff G.
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Vocational, Technical or Trade Scho
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Mercury 2011 60 efi 4 stroke outboard. We were out and the
Mercury 2011 60 efi 4 stroke outboard. We were out and the gaurdian system warning came on. There were 6 short beeps. Powered down and went to dock. Any suggestion where to start ?… read more
Charles
Charles
Marine Mechanic
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5,754 satisfied customers
I have twin 60 hp mercury outboards on the back of a Twin Vee
I have twin 60 hp mercury outboards on the back of a Twin Vee 20 foot cat. I currently have four blade propellers stamped 48-878614.13p. The engines are NOT BIGFOOT MODEL. What size is the best three … read more
Tan
Tan
MerCruiser Certified Technician
Certified Marine Technician
11,409 satisfied customers
I have a mercury 4 stroke 40hp 3cyl 2000 or 2001 runs good
I have a mercury 4 stroke 40hp 3cyl 2000 or 2001 runs good at higher RPM above 2000. Idles ok but if i try to run at between 1200 and 2000 it will not hold the rpm. I have had the carbs off and have t… read more
Jason
Jason
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Vocational, Technical or Trade School
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I have a 16 ft. aluminum Legend fishing boat (side console).
I have a 16 ft. aluminum Legend fishing boat (side console). The hull Weight is 640 lbs. Maximum capacity is 1,220 lbs. The outboard engine is 25 HP EFI 4-Stroke. The engine's full throttle RPM range … read more
Jason
Jason
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Vocational, Technical or Trade School
22,804 satisfied customers
On the net there has been discussion about increasing the horsepower
On the net there has been discussion about increasing the horsepower of Mercury outboard engines by removing restrictions in the carb intakes on the same size and weight engine such as the 50hp to mak… read more
Jeff G.
Jeff G.
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Vocational, Technical or Trade Scho
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I own a 60 HP Suzuki pushing a 71229 40HP Outboard Jet. Unlike
I own a 60 HP Suzuki pushing a 71229 40HP Outboard Jet. Unlike props a jet output is directly related to the RPM of the Motor. At full throttle I am turning 5,000 RPM. I have noticed other identical b… read more
Jason
Jason
Associate Degree
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Having problem with my RPMs falling from 6000, to below 5000
Having problem with my RPM's falling from 6000, to below 5000 wile driving. 2001, 115 Mercury Four Stroke EFI.… read more
Mechman45
Mechman45
Vocational, Technical or Trade School
152 satisfied customers
hi larry . my question is i have my 50 hp mercury 2009 done
hi larry . my question is i have my 50 hp mercury 2009 done 3 hours only fixed on my light boat 550 lbs only and am getting max 4000 rpm and on the engine spesifiction shows 5500-6000 rpm so is it (th… read more
Steve Sr.
Steve Sr.
No Title
High School or GED
79 satisfied customers
I have a 1998 225 EFI 2 stroke outboared..I cannot get 4500
I have a 1998 225 EFI 2 stroke outboared..I cannot get 4500 rpm and when I trim the motor up, it will go to 4900 rpm, thats it..When I first go full throttle it goes to 3000 rpm..After a little bit it… read more
Mechman45
Mechman45
Vocational, Technical or Trade School
152 satisfied customers
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
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Jeff G.

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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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