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Go Back   SailNet Community > On Board > Gear & Maintenance > Poorly Running 9.9 Merc Outboard
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Thread: Poorly Running 9.9 Merc Outboard Reply to Thread
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Topic Review (Newest First)
04-18-2009 11:21 PM
mdbee
Caution - clear fuel filter

If the clear glass filter is exposed to sunlight, the fuel in the filter can start breaking down very quickly. Wouldnt hurt if you were running but letting it sit for days can turn the fuel pretty quick.


Quote:
Originally Posted by Lostmt View Post
I had the same problem. The last time it died was in the ICW with tons of tow and power boat traffic with a head wind. No way to tack out to open water. Very hard on the nerves.

Here's what I did.

1. Cleaned and added another fuel filter. Glass see through.
2. Cleaned the carb. Lot of green junk growing in the carb.
3. Changed the fuel and add Star Tron. I would not recommend Sea Foam.
4. Got new plug. Recommended by the Suzuki. That way I know I have the correct plugs.
5. I now keep a can of spray carb cleaner on the boat.

My 8hp Suzuki 2 stroke is still a little hard to start but runs fine now. Once its warmed up it starts on one pull.

You might find one of your dock mates that will clean your carb for you. One of mine did it for me and only took about 30 minutes. I watch him and now I know how to do it myself. If I had taken it in it would have cost me a couple hundred bucks.
04-18-2009 08:00 PM
pdqaltair
There are standard ASTM tests for gasoline storage and oxidation stability...

Quote:
Originally Posted by pdqaltair View Post
There seems to be a body of evidence that they have something. The trouble is, there are no standard tests for "cleaners." Stabilizers, yes. Cleaners, no ASTM or other recognized tests that I know of - I am not certain of that.
But few of the additive manufacturers run them. Some do, they post them, and I salute that transparency.

The same is true for diesel. Some run tests, some don't.
04-18-2009 06:31 PM
timebandit The reason I asked was because 2 and 4 stroke engines can have different problems.

I dont think having a motor in gear should make any difference if it is a carb problem starting.

Maybe a fuel pump diphram or sucking air somewhere is my guess.

and as a side note

Two stroke mixed gas will last way longer than regular gas.

Quote:
Originally Posted by timebandit
Two stroke or four stroke?

It doesn't matter. Ethanol fuel will cause problems. Same with any additive that contains alcohol.
04-17-2009 09:54 PM
pdqaltair
As for its engine cleaning benifits of this or others, I have no comment.

Quote:
Originally Posted by Lostmt View Post
I had not heard of Star Tron until I had made a post on another forum about the problems that I was having with a dying motor.

Not being a chemist all some of us have is the recommendation from others. I have just started using Star Tron so in time I'll know if it works or not.

I'll email the makers of Star Tron with a link to this discussion and see what they have to say.
There seems to be a body of evidence that they have something. The trouble is, there are no standard tests for "cleaners." Stabilizers, yes. Cleaners, no ASTM or other recognized tests that I know of - I am not certain of that.
04-17-2009 08:48 PM
Lostmt
Quote:
Originally Posted by pdqaltair View Post
and E-10. ALL SNAKE OIL. No product had any measurable effect. I used standard ASTM tests. If you are interested in running your own tests, I can tell you how. I hate bogus advertising.

Keep the tank full (fill when you return to the dock, not when you head out) and sail lots - those are the cures.

I guess I worded that strongly. As I said, I ran the tests. I was actually hoping some product would work.
I had not heard of Star Tron until I had made a post on another forum about the problems that I was having with a dying motor.

Not being a chemist all some of us have is the recommendation from others. I have just started using Star Tron so in time I'll know if it works or not.

I'll email the makers of Star Tron with a link to this discussion and see what they have to say.
04-17-2009 07:01 PM
pdqaltair
Rebuilding can be simple, too.

Quote:
Originally Posted by sailingdog View Post
Given that you don't know the age or status of the spark plugs, changing them with new ones is probably a good start. Rebuilding and cleaning the carburetor is also probably good idea.
While a complete kit is best, often a needle and a good spraying of the inside of the bowl, lid, and passages with carb cleaner are all you need to get by, if varnish is the issue and not age. Repeat several times, since the cleaner attacks the problem in layers.
04-17-2009 06:57 PM
pdqaltair
I ran lab tests on Startron and other regarding separation...

Quote:
Originally Posted by Lostmt View Post
Here some information on ethanol fuel problems. Sea Foam also contains alcohol.

http://www.starbrite.com/whatsnew/ST...%20p3072D2.pdf

It can be purchased at WalMart in the boating section.
and E-10. ALL SNAKE OIL. No product had any measurable effect. I used standard ASTM tests. If you are interested in running your own tests, I can tell you how. I hate bogus advertising.

Keep the tank full (fill when you return to the dock, not when you head out) and sail lots - those are the cures.

I guess I worded that strongly. As I said, I ran the tests. I was actually hoping some product would work.
04-17-2009 05:48 PM
Capnblu Suck, squish, bang, push.
can motor ingest air/fuel? Yes/no
is motor creating good compression when turned over? yes/no
is there a STRONG spark across the plug? yes/no
Does the exhaust have a clear path to exit? yes/no

You need 4 yes's for it to run.
My guess is that you will find that you do not have spark in one plug, or it is going to be weak or intermittent. When the motor warms up, it gets worse, and might stop working at all. Replace the coil, if so.
Your fuel may have been contaminated, since you mentioned carb, I assume therefore that it isn't EFI. So check filters for contamination. Get new fuel. Check for fuel leaks, vacuum leaks in your fuel line are alot worse if you are trying to lift the fuel from a low location. Check hose condition, and clamps. The last thing that seems to fit your explanation, may be an obstructed exhaust.
04-17-2009 02:29 PM
svHyLyte I had the same problem with a 2001 15hp version of the engine (up-tuned version of the 9.9)--so much so that I bought the 5 year warranty from Mercury before the original factory warranty expired. The motor made 5 trips back to the dealer in Sarasota without improvement. The 6th trip--to another shop-proved the fix. It seems that there is a small adjusting screw on the carb that needs be adjusted "just so" (it's actually described in the owner's manual as pointed out by the tech at the second shop). With that adjusted properly, the engine seems to work fine. Without--Not. I would say that its a mixture control but when I suggested that, the tech said it wasn't so I don't know what it actually moderates. It's above and somewhat to the right of the carb barrel as you're facing the motor from the normal user position.

FWIW...

s/v HyLyte
04-17-2009 01:06 PM
escapaide I had a similar problem and found that if i squeezed the promer bulb on my fuel line it would continue to run, i assumed the fuel line had a smal air leak and replaced it and the motor runs fine now
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