Boat

Have Boat Questions? Ask a Boat Repair Expert.

Ask an Expert,
Get an Answer ASAP!

This answer was rated:

I have a 40 hp 2 stroke 1993 mercury outboard that will run…

I have a 40 hp...
I have a 40 hp 2 stroke 1993 mercury outboard that will run great out of the water, put it in the water it wont even start, any suggestions. Tim
Show More
Show Less
Ask Your Own Boat Question
Answered in 2 minutes by:
6/29/2010
Jeff G.
Jeff G., Marine Mechanic
Category: Boat
Satisfied Customers: 4,730
Experience: 42 years experience, Certified Master Technician, All Major Outboards, Sterndrives, Hi-Performance
Verified
Welcome,
I will be happy to assist you. If you have a question or need clarification please post back at any time.
When you put it into the water and try to start what happens? Why was the crankshaft replaced?
Was the engine retimed?
Ask Your Own Boat Question
Customer reply replied 8 years ago
<p>it spits and sputters but wont start, crankshaft was broken when we bought and has been repaired.with the water muffs on it it runs out great, idles around 1000 rpms.their was no visable damage to the cylinders or walls.yes it retimed</p><p> </p>
Check that the flywheel key has not moved in installing the flywheel.
Check for spark on all 4 cylinders with a spark tester set at 1/2".
Remove the fuel pump from the engine, don't take the lines off and squeeze the primer bulb. Is there any fuel leakage out the back of the pump.
Check the fuel pumps on the side of the carbs. Squeeze the fuel pump, do you see any leaking into the throat of the carb?
When running on the hose, spray some WD-40 around the base of the carbs and see if the rpm changes.
Try these tests and post back so we can narrow down where the problem is.
Jeff
Ask Your Own Boat Question
Customer reply replied 8 years ago

while checking the info you sent , i found the nut on the bottom carb bowl was loose and a couple of hoses that needed tighing up , pump seems to be fine. so i put it in a barrel and it ran fine but would not let me put the idle all the way down so i let it run for a few minutes it seem to run fine then, i tiuned it off tried to adjust the idle and would not start again. i checked plugs 3,4 seemed a little black to me. does this sound like timing issue. Tim by the way im in greenville sc.

Tim it sounds like you are rich on those cylinders. Your timing is easy enough to check.
Can you get me the serial number of the engine? Does your engine have the single barrel or two barrel carb?
Jeff G.
Jeff G., Marine Mechanic
Category: Boat
Satisfied Customers: 4,730
Experience: 42 years experience, Certified Master Technician, All Major Outboards, Sterndrives, Hi-Performance
Verified
Jeff G. and 87 other Boat Specialists are ready to help you
Ask your own question now
Customer reply replied 8 years ago
serial # 0d151928, two singles is how i would describe it. how do you check the timing. this boat is driving me crazy.it does seem to put out to much fuel in lower carb.
You check the timing with a timing light.
You can adjust the idle mixture with the screw in the top right of the carb. Turning it in will lean out the mixture. Before you adjust the mixture make sure the carb shutters are closed all the way. If one is cracked open it will mess with the idle speed.
Your initial timing should be 2* give or take a couple degrees.
The initial setting for the idle mixture screw is 1 1/4 turns out from lightly seated.

Here is a link to download on your synchronization. Follow this
Sync and timing

Download this and save to your computer
Ask Your Own Boat Question
Customer reply replied 8 years ago
I checked timing and adjusted idle screw, got it running better but it still shuts down when in water after you throttle it down. There is a lot of gas comming out of the bottom carb after shutdown. Can you tell me how to sinc/adjust carb sync and idle screws on throtle linkage? also the sync and timming download expired before I could save it. Please give me notice as to when you are going to down load this so I can reply and be at my computer. Thanks
Here is the link again; sync
Ask Your Own Boat Question
Was this answer helpful?

How JustAnswer works

step-image
Describe your issueThe assistant will guide you
step-image
Chat 1:1 with a marine mechanicLicensed Experts are available 24/7
step-image
100% satisfaction guaranteeGet all the answers you need
Ask Jeff G. Your Own Question
Jeff G.
Jeff G.
Jeff G., Marine Mechanic
Category: Boat
Satisfied Customers: 4,730
4,730 Satisfied Customers
Experience: 42 years experience, Certified Master Technician, All Major Outboards, Sterndrives, Hi-Performance

Jeff G. is online now

A new question is answered every 9 seconds

How JustAnswer works:

  • Ask an ExpertExperts are full of valuable knowledge and are ready to help with any question. Credentials confirmed by a Fortune 500 verification firm.
  • Get a Professional AnswerVia email, text message, or notification as you wait on our site. Ask follow up questions if you need to.
  • 100% Satisfaction GuaranteeRate the answer you receive.

JustAnswer in the News:

Ask-a-doc Web sites: If you've got a quick question, you can try to get an answer from sites that say they have various specialists on hand to give quick answers... Justanswer.com.
JustAnswer.com...has seen a spike since October in legal questions from readers about layoffs, unemployment and severance.
Web sites like justanswer.com/legal
...leave nothing to chance.
Traffic on JustAnswer rose 14 percent...and had nearly 400,000 page views in 30 days...inquiries related to stress, high blood pressure, drinking and heart pain jumped 33 percent.
Tory Johnson, GMA Workplace Contributor, discusses work-from-home jobs, such as JustAnswer in which verified Experts answer people’s questions.
I will tell you that...the things you have to go through to be an Expert are quite rigorous.

What Customers are Saying:

Wonderful service, prompt, efficient, and accurate. Couldn't have asked for more. I cannot thank you enough for your help.

Mary C.Freshfield, Liverpool, UK

This expert is wonderful. They truly know what they are talking about, and they actually care about you. They really helped put my nerves at ease. Thank you so much!!!!

AlexLos Angeles, CA

Thank you for all your help. It is nice to know that this service is here for people like myself, who need answers fast and are not sure who to consult.

GPHesperia, CA

I couldn't be more satisfied! This is the site I will always come to when I need a second opinion.

JustinKernersville, NC

Just let me say that this encounter has been entirely professional and most helpful. I liked that I could ask additional questions and get answered in a very short turn around.

EstherWoodstock, NY

Thank you so much for taking your time and knowledge to support my concerns. Not only did you answer my questions, you even took it a step further with replying with more pertinent information I needed to know.

RobinElkton, Maryland

He answered my question promptly and gave me accurate, detailed information. If all of your experts are half as good, you have a great thing going here.

DianeDallas, TX

< Previous | Next >

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

17,310 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

4,730 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

< Previous | Next >

Related Boat Questions
I have a 2005 9.9 four stroke outboard that I use on my sail
I have a 2005 Johnson 9.9 four stroke outboard that I use on my sail boat. It was used but only had a bout 10 hours on it and looked like new, ran like crap because the guy never used it and the carb … read more
Expert-Repair
Expert-Repair
Owner Kingsland Auto & Marine Services
Vocational, Technical or Trade Scho
11 satisfied customers
I have a 1994 Mercury Mariner 40 HP 2 stroke Outboard Motor.
I have a 1994 Mercury Mariner 40 HP 2 stroke Outboard Motor. I recently installed a new control box. I want to swap out this engine with a 1997 Force by Mercury Marine 90 HP 2 stroke. Will the connect… read more
Jason
Jason
Marine Mechanic
Vocational, Technical or Trade Scho
17,310 satisfied customers
I have a 40 h.p. force 1998 that vibrates quite a bit even
I have a 40 h.p. force 1998 that vibrates quite a bit even in neutral.Prop doesnt appear to be damage other then a nick or two.This motor is on a 22" pontoon boat all stainless.Guy said he had it tune… read more
Tan
Tan
MerCruiser Certified Technician
Certified Marine Technician
11,264 satisfied customers
engine sometimes starts 1993 115 hp mercury 2 stroke; then
engine sometimes starts 1993 115 hp mercury 2 stroke; then runs then idles also then sometimes runs at full speed; idle it down then it just quits wont start… read more
Clamp-onTech
Clamp-onTech
405 satisfied customers
do you have a picture of the thermostat on 40hp 4 stroke and
do you have a picture of the thermostat on 40hp 4 stroke and how to remove the cover to flush… read more
Tan
Tan
MerCruiser Certified Technician
Certified Marine Technician
11,264 satisfied customers
I have a mercury outboard engine 4 stroke 40 hp, when I go
I have a mercury outboard engine 4 stroke 40 hp, when I go at high speed an alarm comes on and the engine slows down after which the alarm goes off checked sea water pump good stream coming out is the… read more
Malta Tech
Malta Tech
Marine Tech
High School or GED
151 satisfied customers
Have 50 hp mercury outboard. Making continues beep sound at
Have 50 hp mercury outboard. Making continues beep sound at the dash, hot or cold. oil reservoir full. water pump working great. beeps as soon as I start the engine. Does not affect running of the boa… read more
Abiorca
Abiorca
Proprietor
Vocational, Technical or Trade Scho
1,768 satisfied customers
I'm in the market for a lite weight 2-6 HP 4 stroke
I'm in the market for a lite weight 2-6 HP 4 stroke outboard. the 2 thing that are important to me are lite weight and ease of reliable starting. the manufacturers that come to mind are yamaha, murcur… read more
Jeff G.
Jeff G.
Marine Mechanic
Vocational, Technical or Trade Scho
4,730 satisfied customers
purchased a pontoon boat with a 40 hp mercury outboard a few
purchased a pontoon boat with a 40 hp mercury outboard a few weeks ageo.. it runs great during the day.....at dusk or dark....it wont hardly run.....will start and idle but shuts off when you try to g… read more
Jason
Jason
Marine Mechanic
Vocational, Technical or Trade Scho
17,310 satisfied customers
!)I have a 2000 40 hp 4 stroke Mercury outboard model # XXXXX
!)I have a 2000 40 hp 4 stroke Mercury outboard model # XXXXX 4STR. It is a tiller control and manual start. It has maybe 20 hours on it total. Question: can this engine be retro fitted into an electr… read more
Jason
Jason
Marine Mechanic
Vocational, Technical or Trade Scho
17,310 satisfied customers
I have a 12 mth old Seahawk 3.5 Hp 2 stroke done no more than
I have a 12 mth old Seahawk 3.5 Hp 2 stroke done no more than 1 Hours running, I now have it sitting in a drum of fresh water. Earlier The piston seized after sitting unused all through winter I remov… read more
Jason
Jason
Marine Mechanic
Vocational, Technical or Trade Scho
17,310 satisfied customers
Hello I have a 2001 mercury 40 hp. 2 stroke. I would like more
Hello I have a 2001 mercury 40 hp. 2 stroke. I would like more POP out of it because when loaded down with 3 guys and duck gear it labors to plane even though it has power trim. What will it take to c… read more
Jason
Jason
Marine Mechanic
Vocational, Technical or Trade Scho
17,310 satisfied customers
I HAVE A 1996 40 HP MERCURY OUTBOARD MOTOR AND WHEN i RUN AT
I HAVE A 1996 40 HP MERCURY OUTBOARD MOTOR AND WHEN i RUN AT HIGHER RPM'S MY (I THINK IT IS MY OIL WARNING ALARM) STARTS TO CHIP THEN COMES ON STEADY UNTIL I SLOW DOWN. MY OIL RESERVE IS FULL. WHAT IS… read more
Tan
Tan
MerCruiser Certified Technician
Certified Marine Technician
11,264 satisfied customers
I am in the market for a 90 HP Mercury outboard motor. Which
I am in the market for a 90 HP Mercury outboard motor. Which 2 stroke vs 4 stroke) is better for resale,performance and reliability. I ftroll fish a lot, but at the same time, I would like to get from… read more
Noel
Noel
Marine mechanic
Diploma
44 satisfied customers
Need to know if Outboard Motor, 15 HP, model J15EENM, sn
Need to know if Johnson Outboard Motor, 15 HP, model J15EENM, sn Go3630673 Is a 2, 3 or 4 cycle engine. What oil is needed to mix with gas and at what ration.… read more
tom
tom
outboard mechanic
High School or GED
117 satisfied customers
hello, I have a 03/04 Mercury 40 hp 2 stroke outboard, I found
hello, I have a 03/04 Mercury 40 hp 2 stroke outboard, I found a group of 4 wires melted together, just below the starter motor. the wires come out of a sealed box below and to the left of the starter… read more
Jeremy R
Jeremy R
1,069 satisfied customers
I have a new 4 stroke Mercury 9.9 horsepower outboard. I have
I have a new 4 stroke Mercury 9.9 horsepower outboard. I have used the boat three times and the motor started immediately and ran great. Today I tried to start the motor and while the battery is stron… read more
Scott
Scott
Marine technician
Vocational, Technical or Trade Scho
542 satisfied customers
I have a 25 hp 2 stroke outboard,Mercury, tiller drive, ...
I have a 25 hp 2 stroke outboard,Mercury, tiller drive, 2003, 40 hrs total useage. runs good but i am getting some kind of petroleum based discharge when i start it up. I think it comes out thru the e… read more
roger
roger
owner of small engine shop
Vocational, Technical or Trade Scho
350 satisfied customers
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.

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.

Show MoreShow Less

Ask Your Question

x