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Catalina/Capri 25/250 Sailor's Forums

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1996 9.9 horse 4 stroke outboard

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bobprevost
Deckhand

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4 Posts

Initially Posted - 05/31/2011 : 13:11:31

I recently bought the referenced motor and at the time of purchase (Last Sunday) the motor started right up and purred like a kitten. When I got the boat home, I started the motor again with ease and it ran perfectly for a good 30 minutes. Yesterday I got it out on the water with my father in-law and woo hoo the motor started on the 1st pull so I put in gear and it started to go and then died on me. Now the motor will start, but only run for about 5 seconds before it dies. I fought this issue long enough that I can barely lift my arm today from pulling it so many times. I just paid $1000 for the motor so I'm extremely frustrated...little help?

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dmpilc
Master Marine Consultant

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USA
4593 Posts

Response Posted - 05/31/2011 : 14:03:12

Did you try to put it into gear at time of purchase or during the 30 minute test run? First, pull the cover and check to see that none of the electrical wiring is being chafed and shorted out when you put it into gear. I would also contact the seller and find out, in a non-confrontational way, what is going on with the motor. Did he/she experience any of the same problem?
Is there an outboard shop you can take it to?

Edited by - dmpilc on 05/31/2011 14:06:23

PCP777
Master Marine Consultant

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1225 Posts

Response Posted - 05/31/2011 : 14:10:55

Might be a dirty carb, are your fuel lines rated for ethanol and have you used ethanol?

I would call back the seller ASAP.

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John Russell
Master Marine Consultant

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3444 Posts

Response Posted - 05/31/2011 : 14:50:09

What kind of motoer is it?

My Tohatsu had a similar problem when I finally figured out that the linkage on the safety feature that prevents starting while in gear wasn't functioning properly. Adjusted that, started right up. Pull off the cover and you should be able to see that linkage as you move the gear shift from forward to reverse.

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cks
Navigator

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126 Posts

Response Posted - 05/31/2011 : 15:14:00

This was OP's response to my question on catalina 25 forum. He moved the thread here:

"I'm not sure how old the gas is, it was the gas that the seller had when I bought it. I didn't add anything to the gas to prevent water separation. Sounds to me like a good start would be to simply try some fresh gas? Do I need to add something to prevent water separation?"

This may be a water problem. I would try fresh gas first. After that, I'd hate to say it, but it sounds like OP has to pull the carb and clean the jets.

BTW the motor is a Yamaha 4 stroke.

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Stinkpotter
Master Marine Consultant

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Djibouti
9075 Posts

Response Posted - 05/31/2011 : 18:28:32

One little piece of grit in the high-speed jet in the carb and she'll run smoothly at idle (on the idle jet) and die when you throttle up. Ethanol tends to dissolve gunk in an older tank, leading to this issue. And it corrodes steel (and to a lesser extent, aluminum) tanks. Water separation ("phase separation") from ethanol gas generally occurs only in cold weather. If you dump your old gas into your car in the fall, and buy new gas in the spring, you should be fine. That's also a good idea because E-10 gas looses much of its rated octane in just a few months.

Most marine engine manufacturers are now recommending stabilizers in every tank of gas. Some marine fuel suppliers make it an additive. Newer products like StaBil Marine have agents that are said to prevent (or let's say minimize) corrosion from ethanol, which is a serious issue. Since my engine cost more than some cars and most of the boats here, I pay attention to the recommendation. I add both StaBil Marine and StarTron, which use different chemistries.

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bobprevost
Deckhand

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4 Posts

Response Posted - 06/01/2011 : 08:39:05

Thanks everyone for the responses. I'll try a new spark plug, fresh gas and some StaBil and see what happens. If the problem continues, I guess its time to learn how to clean a carb.

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calden
Navigator

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USA
194 Posts

Response Posted - 06/01/2011 : 08:50:09

Every motor guy I've talked to recommends StaBil, the marine version, not the generic red stuff. This is especially important for older motors (I know yours is not that old) when components were engineered for a different type of gasoline than what we have now.

Good luck. I've had my share of bad outboard voodoo. It really puts a damper on sailing.

Carlos

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Sloop Smitten
Master Marine Consultant

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1181 Posts

Response Posted - 06/01/2011 : 12:16:37

<blockquote id="quote"><font size="1" face="Verdana, Arial, Helvetica" id="quote">quote:<hr height="1" noshade id="quote">I'll try a new spark plug, fresh gas and some StaBil and see what happens.<hr height="1" noshade id="quote"></font id="quote"></blockquote id="quote">

I may be stating the obvious but it bears repeating. You should try the clean gas first to see if the condition improves. Make sure you clean the tank and flush the fuel line prior to adding the new gas. If the conditon does not improve you could try adding SeaFoam to the gas and try to clean the carb that way. If still no improvement removing and cleaning the carb is probably the best move. Stabil will not clean your carburetor or remove deposits. It also will not restore stale gas. It's sole purpose is to extend the useful lifetime of stored fuel. Seafoam is a cleaner. Stabil is a preservative.

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bear
Admiral

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USA
909 Posts

Response Posted - 06/02/2011 : 12:23:33

I assume this motor wasn't run without being in water at any time. Destroyed water pump and engine overheats and quits with no cooling. Just a WAG.

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Voyager
Master Marine Consultant

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USA
5352 Posts

Response Posted - 06/05/2011 : 07:27:43

I too wondered whether the engine was run while out of the water for any length of time. Surest way to kill your impeller, then shortly thereafter, to overheat the engine. If it had always been run while in water, however, then my next guess is this.

When I first got Passage, I started the engine and she ran like a top. After about 5 minutes, the engine slowed, then stopped. Nothing I could do to restart. An hour later, I tried it again. Same thing -- it ran awhile, then stopped after a short time.

I checked everything. Then I noticed the gas cap on the fuel tank. There was a lttle vent knob on top of the cap. I opened the vent, heard a whoosh, and realized the engine had created a vacuum in the tank. Now I always check the vent!

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